A popular brand sold on steep price discount, sold out in a week

Wheels of Happiness

Rizal Philippines

4.29.2021

I learned yesterday that a popular bike brand from China which arrived  last Saturday at Villamayor was reportedly being sold at P20k please.

I went to their main office today. it was sold out.    The regular price is about P32K, they sold it only for P23K. 

Watch out for their other promos

I like this post on 5th Baguio ride in 2013; nice recalling

Wheels of Happiness

Rizal Philippines

4.26.2021.

Throw back, memories

http://jorgeusbiker.blogspot.com/search?q=2013+Baguio+ride

Pictures mga kuha ni Timo.  Thank you Timo

Throwback - mga pagyayabang during the younger days (8 years ago)

Wheels of Happiness

Rizal Philippines

4.26.2021

See the  roads before the widening, see the old bikes being used to max out rides.

Mga pagyayabang na post.

2013 ride at Teresa - week end ride.

Exercise caution in buying from e commerce platforms.

Wheels of Happiness

Rizal Philippines

4.25,2021

Fake stores at E commerce platform

Outsmarting scammers

Petition stop E commerce delivery scam

E commerce scam

Pissed consumer

Fake e commerce stores

Earlier this post noticed certain challenging practices in a popular ecommerce platform.  I notice this because I spend most of my time, due to stay at home order, browsing goods on display at their platform and notice some challenges:

1.  Incredibly low price.   Unbelievable.  And then you notice that the store owner wants you to connect with them directly via telephone or whats app.  There is no dp first, then asks for dp.  After you make your dp the owner disappear.   The P15K Cruz is just a bait.

2.  Featuring the whole product and the accessory (say a sticker which is cheap)   You may think you will get the main product but you will get only the sticker or a bolt or nut, and then you will be angry.  (You did not read the ad well)

3.  Another baiting technique    Say they price a hub for P1,500.  But the whole set contains front, rear, and the skewers.    The P1,500 will be for the front hub only and as you click the color family the whole set may cost actually P5,000+   So dont just order.

4.  Wrong send.  I ordered a supposedly high end bike during the e commerce birthday, and I got the deal cheap   however:

     1.  I got the wrong color -  black instead of  yellow

     2.  I got the wrong size -  29er instead of 27.5 er

     3.  They sent me China gs instead of Japanese group set.

     The brakes are binding and not properly adjusted.   

If I send the whole thing back, it would take me 2 mos to get the right merchandise (hopefully) and taxes might be paid. 

Its hard to talk to people who do not understand our language; and who practice what we know they are

Better buy from local vendors.    They are also cheap now, you can get free installation

Increasing menu of options for the MTB drive train.

Wheels of Happiness

Rizal Philippines

4.24.2021.

It used to be just Shimano:   derailleurs, chain, cogs, chain ring,  rear derrailleur and changer.  

Shimano dominated this for a hundred years.  But now, China manufacturers are coming on their own and have their own more competitive products.  

Cogs:      Shimano, SRAM, shuriken (by weapon),  Sagmit.   ZTTO, Sunrace

Changer:   LTWOO, Shimano, SRAM (There are bad ones like Shimaneng0

Chainring:   Shimano, SRAM, Deckas Snail.

Chain:   Shimano, SRAM, PYC, VG, YBN  The most expensive is YBN LDC.

The battle is heaviest in Cogs.

      Most of the entrants are in the 1,500 to 2,000 - Shuriken, Sunrace, Sunshine,  ZTTO, ZRACE.  They are lightweight and claim superior technology.  (Like SRAM many of the owners are Chinese and factory based in Taiwan)   They claim sets carved out from solid SS blocks (as SRAM) and srengthen the rivets on the spider.   

      Right now, I wonder what I would install to replace my aging XT cogs:   (11 -36 to make this 11 -42)

    1.  SAGMIT

    2.  Shiruken

    3.  Shimano (about P9,000)

    4.   Z race

     I am even thinking that the one selling me P1,800 XT is a SAGMIT or sunshine brand with the XT lock.   

Bedding in and/or burning in the brake pads - how to cure disc brakes squeal.

Wheels of Happiness

Rizal Philippines

4.24. 2021.

How to stop squeaking disc brakes

The growing interest in disc brakes even in road bikes should be accompanied by increasing knowledge on disc brake technology.

Other cyclists including the pro, dislike disc brake for the additional weight and more maintenance costs and processes.

One of the never ending problems in disc brakes is brake squeal.

The usual cleaning the brake pads and discs with alcohol and/or sand papering the pads and the disc, there are other things I did not get to know -  the burning in and or bedding in the  brake pads.  This must be done:

     1. When new brake pads or discs are installed;

     2.  Immediately after the cleaning of the pads and the disc

You can do the bedding in either by:

1.  Riding down a long hill with brakes engaged 75%.   You are literally burning the disc and the pads with this process

2.  Ride on a level ground using the largest rear cogs, and engaging the  brakes slightly (same 75%)  The squeak may recur but eventually as the disc and pads bed in the squeal should disappear.  

Stalling or deferring upgrades (or having more bikes)- a reflection

Wheels of Happiness

Rizal Philippines

4.21.2021

Upgraditis from Rappler

                                                         Nanukso pa

                                                  

Like the real virus, the upgraditis virus I submit is on the rise.  With nothing to do at homes,) being kept at bay by IATF enforcers with crooked understanding of the virus spread) one spends a lot of time looking at new products at 1.  ecommerce platform and thus becomes convinced by the marketing blitz by bike/bike parts. Mind you,  once you view their page, they follow you and flash the product ads that you browsed. thus increasing your desire and interest (the ads now being personalized and targeted)

UPGRADES ACCOMPLISHED

All ready I ordered and its in the Philippines now, a 25K net (being ordered on the platforms 10 th birthday)  a carbon fiber MTB 27.5 with all shimano parts. I also ordered bigger diameter 180 mm disc rotor for more stopping power.   I was tantalized into buying a four piston hydraulic brakeset however literature on the net and my interviews with mechanic and other younger riders say:

       1   It is more expensive

       2.  The 1 cm longer brake pad runs into thousands    A certain brand costs P2,500 each

       3    Expensive to maintain because there are 4 pistons to maintain (for each side)

       4.  Difficult to bleed

       5.  Gains in braking power is marginal

           More braking power can be achieved through bigger rotors (say 180 and 203 mm) 

But I have all ready upgrades in mind

1.   A 42 or 46 t cogs for my present bike

2.   Or upgrade to a Shimano or SRAM 11 or 12 speed   And they look temptingly affordable

3.   Another option is to buy a narrow wide Deckas or Snail chain ring 32, 34, or 36

4.   Fork upgrade with Bolany, Fox or Suntour.

But really at my age, do I need all of these:  //QUESTIONS BEFORE UPGRADING

1.   Will the upgrade make me go faster?

2.   Will teh upgrade make me stronger?

3.   Will the upgrade make me look younger or better?

4.   Will the wifey approve the purchase.

Most of the time the answer will be no. Especially no 4.  (He2 tell me you have been honest with the wifey on this)

3 years ago I assembled 2 high end road bike and did not engage in upgrade there after.  But the purchase did not make me go faster, stronger (as a matter of fact my heart rate shoots up whenever I do hill climbs) and my average speed declines.   My only Yes answer  is number 3.  

      Let us analyze

      1.  Go one by, and lighten your bike  by 1 kg -  the shifter, the FD and two chain ring.   Really  did 

           the upgrade make you go faster.  My cousin who is on one by says stay put with 3 by.   The range

           of gears is higher with a 24 or 22 teeth.   I say numerous elderly MTB riders who have two by 

           They installed a 34 or 36 as the upgrade anad retained the granny front chain ring of 24.  I have

           seen numerous rider bringing one by walking up their bikes at Teresa  (tulak)

     2.  Go 12 speed, 1 by with 11 - 52 gears.    Again that will set you back by P15 to P20K.  If you

           have extra money, then there is no problem.  But it is an issue if you are hard uup during the 

           pandemic.  Both S companies are pouring it on to sell their 11 or 12 speed 1 by set up.   Mostly

           below P20K  (see also the second hand market with a deluge of ads)   The local bike shops are

           competing with E commerce platforms  They have become cheaper (look at shrinking market

           locally and world wide.  Anyway they had their heyday)    With the cancellation of many local

           and international races, diminished income, many can ill afford to upgrade.

These two last reflection  made me wane my interest on the one by.  (Most probably I buy a Deckas 34 or 36, convert my 3 chain rings) probably buy a 11-46 cogs   

Really why do we upgrade?

WHY DO WE UPGRADE?

     I think this is both a function of marketing efforts of the bike and bike parts manufacturer and the motivation of men.    Bertrand Russel succintly says that men are motivated only by three things:

     1.  Pride

     2.  Competitiveness

     3.  Greed

     We upgrade because we want to be well known and praised because we have such pricey bikes

and new parts;  we want to look better and "lamang"to other bikers.   And we want to have more.  It is not just fmr FL who wants to have more shoes.  Every rider wants to have more bikes.    How many bikes do you have.   Most tour riders have 10 bikes.   I think most local 3 riders have 3 bikes.   

How many bikes do you have?

Bearing stories - buying bearing cartridges too early

Wheels of Happiness

Rizal Philippines

4.22.2021

Regreasing the sealed bearing cartridge of a headset.

About 3 months ago, the wheelset of my carbon fiber P bike developed a humming grating sound at the rear wheel.  I brought this to the mechanic and he ruled a bearing "palitin"  case.  All that remained was to determine the bearing number.

Unfortunately too the carbon part of the wheel also had deep gouge marks due too hard carbon brake pads.  The controversial repair (which cost a lot of PHP) was finished and the next thing to be accomplished is the defective hub with sounds.

Last Saturday, I brought the bike to the LBS to determine the  correct bearing number.   The numbers are hard to read but I guessed it to be 6802 (as the hubset is Novatec) and is the most common bearing for hubs.  It is 6802!

And so I went to the bearing center in the next town.  (The travel took nearly 2 hours - a distance of only 20 km because of the horrendous traffic due to diversion.

The bearing cost me P200.00 (up from P130.00 a year ago)   The problem is that there was only 1 piece remaining and there was no sure restock timeline.

I searched at an e commerce store, and found the 6802 to be only P160.00 for a set of 10.  I had these ordered Tuesday.   

6802 bearings

However I watched a video on how sealed bearing could be regreased.   You simply pry off the steel rubber cover of the bearing (either black, red, or blue)   You use a pointed cutter to pry off the seal (hence the sealed bearing)

This post experimented with the MTB and was able to do this successfully on front and rear wheels.  For the MTB the drive side bearings were toast and looked rusted.   So it was kind of challenge to remove the dirty grease inside the cartridge.  I had to spray WD 40 and soak the bearings and turn the wheel on the side to remove the rusty solution.   Then, instead of grease I placed light oil and replaced the seals.   (The bearing number is 6001

Then I tried this on the carbon wheel.  (where the 6802 were)    There were 4 bearings that needed attention.   2 on the drive side (the axle) and 2 in the hub set.    The drive side bearings were problematic - one on the axle and two on the hub.    The drive bearing was rusted, the  hub bearings were dry.   They may be causing the humming grating sound.  And so I placed again light oil and grease.  It was also the chance to clean the pawls and their springs and again placed light oil (instead of grease) so that it wont get stuck. 

Now I dont think I need the bearings anymore.  Wastage of about P400.00

Knowing something new could be costly

The take away from this article is:

1,  You must service your sealed bearing periodically.  A sealed bearing is not something that runs perpetually.  It needs to be lubricated.

2.  It can be done even while still on the wheel by peeling of the metallic plastic or rubber seal.

     Once the bearing in cages can be seen, you can clean the bearing and lubricate this.  Demo shows

     that light lubed bearings are faster and efficient.  All you need is a pointed tip of a cutter.

So next question, what do I do with th 6802 bearing I ordered.  

Application of what was learned yesterday: regreasing sealed bearing, (later removal and installation of sealed bearing at the hubs)

Wheels of Happiness

Rizal Philippines.

4.21,2021

Yesterday, I learned from Google (You Tube) on how to:

1.  Regrease sealed bearing (I thought you grease them only at the shaft;

2.  Removal and installation of sealed bearing

We usually bring the bike to the bike shop for these two services

1.  Regreasing the sealed bearing

    With a pick or a sharp pointed cutter, we pry off the rubber cover of the sealed bearing.  Then we see 

     the bearings on their cage.   We can discover that:   they are dry or rusty. 

     I was able to do this with an MTB with sealed bearing. I think the practice can save you money from 

     buying the hard to get bearings, and or prolong their lives. 

     I eliminated the funny noise from the rear hub of MTB and the wheels turn faster and smoother.

 2.   Removal of the sealed bearing

    1. Without tools

         1.  You can use a flat head screw driver to dislodge the bearing from the hub.   Be careful

               not to scratch the inside of the hub; as you would have difficulty in reinstallation.

              or use a drift if the shaft/axle using a rubber mallet.   Attach a nut on the axle shaft so as

              to destroy the threads.

       2.  Reinstallation

            Use the old bearing as a drift to reinstall the bearing.   Use the rubber mallet again to drive

            the bearing again

   2.  With tools

        1.   For novatec, there are special tools.   There is a bolt with expander that you grasp the 

              the inside of the bearing hub.  Then to remove, as in the crankset puller, you turn the upper

              portion so that the puller extracts the bearing from the hub.

       2.  Or use steel round bar with endless threads (about 14 to 18 cm)   At the end are large washers 

             that can grab the  diameter of the bearing.    You pull from the other side by turn a butterfly 

             nut or ordinary nut to pull, dislodge the bearing

      3.  Reinstallation is the reverse of removal.  

Look no further - competitive pricing at VMP

Wheels of Happiness

Rizal Philippines

4.16.2021

Look no further - pricing at Villamayor at Pag asa is very competitive.

I have been browsing at Marketplace and the ecommerce platform the price of famous group set 11-50 teeth 12 speed that fits your Shimano 10 speed hub.   

                                        Prices at the Ecommerce                             Market place

                   SX              12k to 15k                                                      14 -  17

                   GX             19 -  20K                                                       21 - 26K

VMP will price this (not yet LP -  15k for SX and P20k for GX NX.  

Laban.   

SRAM GX eagle review

Riding for strength pedalling at 50 t chainring all through out at RB, and 42 at MTB

Wheels of Happiness

Rizal Philippines

4.16.2021.

Yesterday, I rode up to Morong using only 50t chainring.  Its same chainring on flats and hills.  For the hills it was 50 x  30     Today at quarry road, I road up hill using 42 x 32.   My legs and thights now ache.

At the steepest part, I downshifted to 32.    (No choice, otherwise the bike stops moving and fall)

I understand that is the rationale for the one by.   To use only one chain ring through out the shifting range.  

What do you choose at number of teeth for the crank:  30, 32, 32, 34, 36, or 38.?

I would choose 34.   That would be the ideal gear for a RB and MTB especially for senior. 

Converting to a one by MTB 

One by 9 speed is better?

SRAM cogs 12 speed compatibility with Shimano 10 speed hub

Wheels of Happiness

Rizal Philippines

4.15.2021

This post was contemplating on investing in the present bike with a SRAM SX, GX and NX.  GX and NX are much more expensive by 3 to 5k, the only difference being the pulley on top side that assists the cable.  Otherwise  they are almost the same.

The GX and NX are in the 20k range local (P16 to 17 at e commerce platform) , the SX could be as little as P14K (local)

The more important thing with the 12 spd is the wide range of teeth:  there is little jump on number of teeth between gears and therefore less stressful on the legs:

• 10, 12, 14, 16, 18, 21, 24, 28, 32, 36, 42, 52 teeth  (@2 spacing 10 -18);  3 spacing between 18 to 24;  @4
• between 24 to 42,  and 10 between 42 and 52  (Thats where the sudden jump is )
• Weight: 350g

The relevant questions that could prevent me from investing:

1.  Will the 12t cogs fit into 10 speed Shimano cogs..   Both the mechanic and Mr. Google says yes.  

      The situation is different with road bikes where it is difficult to fit a 11 speed on the 10 speed.   Its 

       because most of the cogs of higher number of teeth is on the wheel side

2.  Do you need an XD drive for your drive train to accept  the 12 speed.   A.  No need.   The sales

     person from VMP showed me it fits.  

The question being raised is how come SRAM was able to make the 12t cogs fit into the same space as a 10 speed   The answer seems to be in th echain.   So I guess for the system to work, you have to buy the SRAM chain.  YBN or China chain will not seem to work

New Free Hub technology that we may not be aware of

Wheels of Happiness

Rizal Philippines

4.14.2021

This post came across new free hub technology (I was not aware of this)

1.  Old tech:  the shimano free hub with narrow and wide spline.

2.  X drive by SRAM (to accommodate their 10 -42 developed in 2013

3.  Microspline developed in 2018 for the 12 speed cogs

New freehub tech

Bike Ride to Mahabang Parang Angono via DOMSA - the place to be for bikers these days.

Wheels of Happiness

Rizal Philippines

4.12.2021

This post biked together with ragtag Recylists:    Master E, Sonny, Vhal,  Joel, Machete and Jess from Iglesia to the summit (near the NGCP towers)   We stopped over at the summit but Sonny had a flat tire which had to be fixed.  Up to that point, I was able to prove that I was not yet "laos" because I did not stop nor pushed my bike.   (One did - he was younger)

I must have seen about a hundred cyclists MTB and RB come this way.  Because there is a checkpoint at Pag asa, most cant go to Antenna or Quarry Road.    (I guess there is no checkpoint blocking the path of cyclists coming from MM)

Ingat kapadyak, fellow riders.  

Planned improvements (upgrades) for the Chinese carbon fiber MTB

Wheels of Happiness

Rizal Philippines

4.11.2021

This post ordered through his daughter a Twitter Carbon fiber MTB via the Ecommerce platform on its birthday.  It was listed at P30K but after the birthday discounts etc, the net price was P25K

It is 3 x 10 with Shimano FD and RD, Shimano M200 hydraulic brake, but Restropec crank, 24, 32 42 but with air shocks and remote lockout.   All with other Twitter parts:  hub, seatpost, saddle, handlebar, stem (and maybe the headset) and weighs in at light 11.7 kg.   (light)  It is colored yellow and expects to arrive this coming Friday.  It shod with Kenda Tires  1.95 inches wide.  

All ready I have plans on what I can improve:

      1.  Order a rear quad piston brake for the rear;    Shimano Zee quad piston brakes

      2.  Order a 2by Deore for the crank (if it will make the bike lighter further)

           or convert the retrospec to one by with a Deckas chainring.  

Be careful wnen ordering when enticed to buy at an E commerce platform

Wheels of Happiness

Rizal Philippines

4.11.2021

This morning I was attracted by a post at the platform that says a Magnesium Legged Manitou air shock cost P2,000.  It was too good to be true  (It was)

However when I clicked the ordering boxes, the P2,000 is only the control unit.  The whole merchandise which included the P2,000 was roughly P20,000. 

Then there was this second hand part for xt hub for only P446.00.  However, it turned out that was only for a spoke.  The rest of the hub was priced at nearly P5,000.00

A 4 piston brakeset was listed at P5,000+ plus.  However that was for the 4++ seres,  For the 5+++ series, it is priced upon clicking nearly P10,000.  

Is there no law governing truth in advertising pricing at the Mainland... Are they not subject to conform to the Price Tag law

There are so many posts like that so I may get tired looking browsing at the platform.   Are our yellow brethren that wily and smart?

Malaya na? Tapos na lockdown?

Wheels of Happiness

Rizal Philippines

4.11.2021

Surprise.  Surprise. 

No police at checkpoint, or lax.

I planned to go to Quarry Road via Domsa but for curiosity I checked the checkpoint at Gate 1.  There was none.  So I went to Mambog and there was no police there too.  

Our other kapadyak went up via DOMSA.   

Are our days of being at home (we are no longer safe at home) over?   

Temptation to go one by

Wheels of Happiness

Rizal Philippines

4.10.2021

There is a growing temptation for me to go one by:

Why:

1.  It is trending

2.  It adds to the beauty of the bike -  cleaner and "maangas"

3.  It makes the bike lighter by 300 to 600 grams (you remove the shifter and the fd and 2 other chain rings..   

1.  Convert my crank with 104 bcd to one one by by buying a Deckas chain ring.   That cost from P189 to to P219.  With number of teeth from 30 to 38.  And available in multiple colors - gold, red, black green.  

2.  Get well known brands:  deore  or SRAM that costs P4,000 for Shimano (may 2 by na rin)  to P7,000.

3.  Or get  Ragasa, Sagmit (down to P2,200 each with bottom bracket all ready   You can convert this to 2 by.  Its lightweight  about 700 grams

  https://www.youtube.com/watch?v=cDxrZ0a4oW8

Completing repair on the rear hub of XT GS at Mosso

Wheels of Happiness

Rizal Philippines

4.10.2021

The 5 year old plus Mosso is showing signs of aging.  The rear hub has some play and some sounds being generated.  I regreased and replaced the ball bearings.  However, there are scores on the cones block.  It need  replacement.   

There are several options:

      1.  Buy a non Shimano hub (but I cant use the expensive ice rotor -   Shimano has the only centerl                   lock system for Ice Tech disc

      2.  Buy another Shimano XT but mine is 24 holes and straight pull.  Cant find similar spare

      3.  Buy a cone set or repair kit:

          1. I inquired from Quiapo, local store    no reply

          2. Saw a cone only post, but that is good for 1/4 ball bearing  mine is 3/16  -  I consulted the                       mechanic

Finally I found this but its gonna cost me.   

Shimano XT M8000 replacement parts rear

SHIMANO XT M775 M785 M8000 wheel hub hub base axle ball gear block repair parts

Product details of SHIMANO XT M775 M785 M8000 wheel hub hub base axle ball gear block repair parts

• Shimano XT original repair parts, only suitable for XT quick release hubs, not suitableOther models and barrel axle versions, M775/M785/M8000 quick release version hub repair parts are universal (the 775 series has a little difference in the shape of the outer nut of the rear left axle block),
• The left and right front hub and the left rear hubThe sealing covers on both sides are the same.
• The repair parts are all brand new authentic licensed products.There are only 13 balls on the right side of the rear hub, 20 balls in a bag, too lazy to remove it, it’s not expensive.
• The ball Y26J98030 with cage is suitable for the left and right sides of the front hub and the left side of the rear hub.
• Made in Malaysia.
• SHIMANO XT M775 M785 M8000 wheel hub hub base axle ball gear block repair parts

Shimano XT original repair parts, only suitable for XT quick release hubs, not suitableOther models and barrel axle versions, M775/M785/M8000 quick release version hub repair parts are universal (the 775 series has a little difference in the shape of the outer nut of the rear left axle block),

The left and right front hub and the left rear hubThe sealing covers on both sides are the same.

The repair parts are all brand new authentic licensed products.There are only 13 balls on the right side of the rear hub, 20 balls in a bag, too lazy to remove it, it’s not expensive.

The ball Y26J98030 with cage is suitable for the left and right sides of the front hub and the left side of the rear hub.

Made in Malaysia.

Mas mura 1658 only

Installing the brake pads on campy bike

Wheels of Happiness

Rizal Philippines

4.09.2021

Because of economizing on brake pads (I lost the two pads before - wrong installation?) I used SRAM swiss stop which may be too hard on the carbon rim.  Result - ruined rims at the back wheel - Bora

It costs me a fortune to have the carbon repair.  According the shop, there were 3 places were the wheelset was crooked.   (Result of the MC collision at Mabalacat last year)

This post inquired from Sir VM this spare brake pad and he sent me two sets (of 4 pads each) and this must cost a fortune.   

This post finished the installation under two hours.     VM warned me it would take herculean effort to install this.  But I sprayed alcohol and detergent and this was no problem.   

Learning plenty on MTB bike repairs during the ECQ

Wheels of Happiness

Rizal Philippines

4.09.2021

Happy 70th birthday to my wifey.

During this pandemic, and yesterday and today in particular, this post learned from YouTube the following:

1.  Removal of the piston using water syringe;

2.  Use of syringe for bleeding the hydraulic brake set;

3.  Addition of mineral oil on older hydraulic brake set  (you remove the top cover, and simply pour the mineral oil on top;

4.  Simplified bleeding of the hydraulic system;

5.  The slight difference in brake pads of dual and quad piston (only one cm in length)

6.  That the braking force is affected by the radius of the brake disk - directly proportional...

     Hence the increasing in brake torque is smore affected by the disk size (diameter and radius)

7.  How to install new olive and insert when cutting cable hose, and or changing cable hose (as in some brakes like zoom have left to the rear, and right to the front.  You have to switch the hose between the front and back.

     Some methods:

     1.  Clamp the hose and hammer the metal part into the hose; and then insert the olive and have the 

          8 mm tube clamp press fit the olive.   

     2.  Buy the tool.   The olive and the insert, and the tool would not cost more than P300.00 I will order

     2. Use a press tool.   Instead of hammering the tube insert.  

More on quad vs dual brake system for MTB

Wheels of Happiness

Rizal Philippines

4.09.2021

Remembering the fall of Bataan.    (Reminds us that we should not give up Philippine territories - which we are doing without putting up a fight)

More on quad piston brakes:

1.  Marginal gains can be achieved of only 10%;

2.  We base on the surface area of brake pads, the  difference between the dual and quad brake piston is roughly 1 cm only.  Since we base the brake torque on surface area, surely gains can be marginal.

Quad vs dual piston brakes.

3.  The formula for calculating brake force (torque)

Calculate the torque that the force of the road causes about the axle. Because torque equals force times its distance from the point of rotation, the torque equals the force of the road times the radius of the wheel. The force of the road is the equal and opposite torsional reaction caused by the brakes, so the braking torque is equal in magnitude and opposite in direction to the torque exerted by the road. If the Jeep's wheel has a radius of 0.25 meters, the braking torque equals 8,000 N * 0.25 m, or 2,000 Newton-meters.

Let us assume we need a force of 1,000 nM to stop the bike:

       For   160 mm.   R =  80 mm     .08 meter   =    80 nM

       For    180 mm   R=   90 mm      09 meter   =    90 nM

       For    203 mm   R = 101.5        .10 meter   =  100 nM

Unless we can show we are increasing the  force being applied (unless the brake lever increases in size, then the force is seen to be constant.    The pad force would be constant unless the area of the piston has increased.  

     

Do quad piston brakes work better than dual piston? I asked an experienced good mechanic

Wheels of Happiness

Rizal Philippines

4.08.2021

Slideshare on Mt Bike disc brakes

For every 20mm increase in diameter, there is 20% increase in brake power,  Hence. the maximum increase can be had for 203 rotor size (from n 160 mm) - 40%

During the last two weeks, my mind was struggling to continue with my planned purchase of P3k ish quad piston brake.  (Its review though has been bad)

Some literature even mentions that larger gains can be made by increasing  the diameter of the disc rotor say up to 203 or 180.   where gains of 30 - 40 can be had.

So I asked a good and experienced mechanics (he grew up in Cuatro Cantos) and he pronounced that if ever it works, ever so slightly compared to two piston brakes.   It is difficult to bleed.  Some literature mentions that longer pads tend to flex more and result in chatter and brake material separation from backing.  This is consistent with  a vlogger report for its disappointing performance  (Not dramatic stopping power)   The gain in quad piston brake is only 10%.   Maybe this can be judged from length of brake pad which is roughly that much only:   4 cm single vs 5 cm for quad. 

Increasing braking power by increasing rotor size

Yes, it’s just the ratio, assuming the same calipers.

A hand-waving calculation would be:

Deceleration = braking force x (rotor diameter / wheel diameter)

The braking force is constant (same caliper), the wheel diameter is the same, so if you increase rotor size you increase the deceleration.

So save your PHP.  Invest only in larger disc (may be only in front)  better material for the brake pads.

If you dont do downhill, or free fall rides, be content with your 140 mm, 160 mm set up double piston.

My Campy Ultra Bora 2 was injured by wrong brake pads; have to have the right expensive pads

Wheels of Happiness

Rizal Philippines

4.08.2021

Kapadyak beware.  Be sure you get the right brake pads for your rim brake in your carbon fiber wheel set rig.   

The compound I used was a sram pad, it was hard, and did not take pity on the rim;   The experience left  deep gouge on the rim.  I sent it to a carbon fiber shop, at Morong Rizal,  It took them days to do this plus a hefty charge.

It will be taken by one of our staffers, and tomorrow, I will get from my brother the correct, albeit, expensive pads.    (The repair and brake pads cost the same -  not good during time of pandemic)

                               

                                                                      Yellow king