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.
