Removal and reinstallation (swap) of Campy crank bearing 6805 5 mm

Wheels of Happiness

The Pinarello bike all ready had lateral movement on the crank,  While Mario serviced this about 6 months ago, long time has a way of saying the bearing is old and needs replacement.   From the video, I saw that the crank need 6805 (24 mm) but has to be 6 mm. Most that are available online is  7 mm.  The original bearing is Cult and cost $100      

My first problems are the tools:  the 10 mm removal tool, the puller and the press fit.  No hammer, no drift as per video.

1. For the 10 mm hex, my difficulty was that the short end will not fit into the crank so it has to be a long arm to fit  None is available at DIY or Wigo.  So I thought of fitting a 10 mm socket at the short end of the hex and use that to remove the nut.   And so I did.

2.  For removal and installation, I had the bike mechanic nearby do the job  Paid him P100.00.  I did not have to buy the tools

Lateral movement solved

New Learnings from my adventure with bearings

Wheels of Happiness

As this post tries to study and repair bearings, many things have been learned:

1.   Headsets and bbs are expensive.  However, bearings for headset can be bought cheaply.

                Head set cost P500- 700.  However, bearings will set you back by P70.00 each x 2 =  

                               P140.00.  That is 1/5 to 1/6 of the whole headset 

                BB say for shimano cost P700.00.  However 6805 bearing may be had for only P46.00 each

2.   Bearings can be re bearing.  Its balls can be replaced giving it a better life.   Bearings that are small

               can be bought from Sising.  A pack of more than 100+ cost only P30.00

              Steps for rebearing:

               1.  Remove the Rubber seals front and back

               2.  Push the plastic bearing cage from the front, and the back will fall off

               3.  Do this on a table with the towel.  The bearings will fall off and scatter

               4.  Soak the bearing and the races in degreaser.  Clean  (Servicing the bearing at the bike -

                     crank, headset or wheel set does not clean the bearing thoroughly.  

               5.  You can use the same bearing or use the new one from Sising.    According to the YT

                     source you can do this five times at least

               6.  To reconstruct, place the bearings:  14 first on the outer race.  Then insert the inner race

                     and then wiggle in the 15th.   Make the distance between the inner and outer equidistant

                     and then try to get the other bearings to the top.  That will lock the inner and outer race

               7.  Patiently try to get the bearings inside the designated cages

               8.  Lube the berarings:  oil and light grease

               9l  Replace the RS seals

               10.  reinstall at the BB or head set

               REBEARING is even cheaper.  Because you can recycle old bearings again and again

               A pack of 150 small bearings will set you back by P30.00 and you can replace  6 bearings

               You can still reuse old ball bearings

  3. After having done 2, you learn that bearings are fragile and can be destroyed by wacking or 

      hammering

  4.  Bearings easily get fouled up especially the BB and head set.   Servicing them requires 

        closer interval

  5  The two problems with bearings are:   removal and press (reinstallation)

  6.  Many mechanics and bike owners prefer to use hammer and a drift especially for hubs

       The removal tools involve pushing out (for BB) and pulling (using pullers) and or tools

        that expand within the ID of the inner race.   

       Variants include:

       1.  Steel made toks

       2    Attachments that expand with split bolt that expand within the inner race when the inner

              bolt is drive down

       3.   Cylinder cut diagonally that expand when pulled by another bolt

  7.  Press fit

       Require a threaded rod and two nuts.  The drift for the bearing could be a washer, another bearing

       or brass attachment for hoses.   Maybe you should buy the commercial drifts:  for 24 mm, and 

       30 mm for BB, and for head sets :  31 to 52 mm

  8.  A whole set of pushers and press fit can set you back by P1,500 for ZTTO.  However I saw 

       a Lazada post featured a ZTTO set for only P500+ 

  9.   The easiest cheapest way to service bearings especially for hub bearings is via tapping with a drift:

        1  Removal:    For front wheel Using a cup or two pieces of wood, put the wheel hub on this and                                     lightly tap the axle   The other bearing will fall of.  Tap lightly hit accurately and

                               be careful not to nick the hub.

                              You can remove the other bearing tapping round round the bearing

                              For the free  hub:  If there is a stopper, push the tube slightly to one side to access the

                                                    the bearing.  When you have removed the stopper you can easily tap

                                                    out the other bearing

                              For the wheel hub:   Use an old shimano axle use the nut to push against the bearing

                                                   and tap.

         2.  Press fit by tapping:

                            Use a size 22 or 24 socket wrench or same bearing to tap in the new bearing

                            Sand paper the drift bearing so that it may not get stuck with the new bearing

                            Only taps not hammer

  10.   Wheel bearings are usually:  6000, 6001, 60100, 6802, 6902.

                                                         6806  if for BB30, 386, 

                                                         RS refers to rubber seal.  RS 2 means RS for both sides  1 RS 

                                                         is better

                                                         ZZ bearings are sturdier have steel seals.  However they are

                                                          not serviceable and not very efficient.  

                                                          6805 if for Shimano, campy cranks

  11.  The biggest enemy of bearings is moisture and rusting.   Thus, it is essential not to water 

          your bike, ride it during rains, or through flooded streets or streams.   Be sure to  disassemble

          clean and dry when you do.

                              

   

Minding your bearings

Wheels of Happiness

Lately I have turned my attention to bearings:   

1.   Numbers:

      6805 -  ID 25 mm, used in Shimano BB and Campy cranks (their bearing is installed inside instead        of    at bb

      6806  - ID is 30 mm used at 386, BB30  BB.   Preferred thickness is 6 mm.

      6000 and 6001 for front and rear hubs 10 and 12mm id

      6802  ID is 15 mm and used for some higher ends hubs

2.  Bearing maintenance

     The casual, light maintenance is peeling off the RS (rubber seals) spraying the interior with                      degrease and then putting light oil and grease, then resealing

     If there is looseness or movement the whole bearing is replaced.  Bearings are cheap, and some goe

     for P100/10 pcs.  Then the expensive ones costing P400 are ceramic.  

    But I found out lately that the bearings can be disassembled and races separated and plastic cages

    removed and cleaned thoroughly.  Each bearings cleaned and then restored  It takes a lot of patience

    to reassemble

3.  Bearing remover:

    1.  Usual tap tap whack on the bearing with the screw driver.  But bearings are fragile

    2.  Bearing pusher produced by Ztto and Mozqec but only good for 25 and 30 bb only

         No puller for hub bearings with id from 10 to 15mm

   3.  The bearing puller for these are the split bolt,   used to pull blind bearings for motorcycle

4.  Bearing press fit

     Essentially a threaded rod with drifts from both side.   Can be good for all sizes of bearing

     Vise, or light tap using old bearing can achieve same purpose