FREE GROUND SHIPPING ON DOMESTIC ORDERS OVER $35

Bottom Bracket Bearing service

A common question we get is "how exactly do I remove the bearings to service the BB"... well, here's a few pictures to show you, its pretty easy and fast to do.

1) Remove your crankset

There are many varieties of cranks, so refer to the instructions from your specific manufacturer. The ones in the photos below are of a SRAM Crank with a DUB Spindle using a Chrisking Threadfit30 Bottom Bracket

Remove any spacers, washers and adapters and note the specific location so you can reinstall them in the correct place later.

 

2) Remove the spindle sleeves.

(yours may look slightly different, as the sleeves are specific to crankset)
You can use a small flathead-screwdriver and gently pry below the lip to work it out. It maybe also possible to push it from the backside. Do this with care as not to damage the plastic.

Remove the spindle sleeve

3) Remove the clip

Using a small pointed pick or a thin, small flat blade screwdriver, locate the split in the metal clip.
Gently insert to one side of the split and lever upwards to release the clip.Take care not to damage the seal underneath the clip.

Removing the clip 1

 

Removing the clip

4) Remove the seal

The seal is delicate so take care. It should come off very easily and please note the shape  and orientation of it. A used seal will have a sculpted "volcano" shape and this is important to note the orientation for re-installation later.

remove the seal

Removing the seal 2

5) Cleaning the bearings

The bearings are now exposed for cleaning, and there is no need to remove the BB Cup from the bicycle frame, so the bearings can be cleaned on the bike.

Using a toothbrush, rag and some non citrus degreaser / solvent give the bearings a good clean, flushing all the old grease and dirt out.
Do this a couple of times and you will notice a lot of dirt comes out onto the rag and you start to see the bearings and the lighter coloured ball bearing retainer.

exposed bearings

cleaning bearings

cleaning bearings 2

6) Drying the bearings

Dry the bearings with either compressed air or a clean rag to remove excess solvent / degreaser

Drying Bearings

7) Clean the clip and seal

Clean the metal clip and *gently* clean the seal, note for any damage. Replace the seal if you see any nicks, twists or rips .Replace the clip if it is warped or bent. Replacement parts are available (see end of article)

clean the seal

Seal below:

cleaning the seal

8) Lubricate the bearing

Using Chris King Silver Grease apply a bead of grease 1/2 way around the bearing. Rotate bearing with fingers to distribute the grease fully.

regrease

greasing

greasing

9) Re-install Seal and Clip

When re-installing the seal note the shape and install with the highest point of the "volcano" away / outward from the BB (for a new seal this doesn't matter as the new seal will be flat). If you reinstall the seal the reverse way around you can notice because the bearing will feel like it has a lot of drag.

replace seal

When re-installing the clip, Start at the split and install in one direction all the way around. The clip fits in a small groove, so use a pick or small flat screwdriver to fully seat. When fully around, run your tool over the split and make sure the two ends of the split are flush and the snap ring is clipped in.

seating snap ring

You can see the"split" below close to the 12 o'clock position.

10) Final Steps

Apply a little bit of Blue grease or standard assembly grease to the Spindle Sleeve and push into the bearing. Congratulations, you are now ready to complete the same procedure on the other side of the BB.

Inserting spindle sleeve

Remember when re-installing the crank, put spacers / washers in the same position from the disassembly, when crank is fully torqued to spec check for lateral (side to side) play by apply pressure across the crank arms. If it is loose or there is lateral movement DO NOT ride. Inspect your work and consult a bicycle mechanic as needed.

TIPS:

We recommend servicing you bearings once per year on a bicycle that is ridden frequently.

 

 

Spare Parts are available for clips, seals and grease.
Threadfit 24, T47 24mm - Clips and Seals - PHS473
Threadfit 30, T47 30 x or i - Clip and seal - PHS475


ADDITIONAL INFO:

Another tutorial on cleaning bearings here 

Chris King Silver bearing grease here

Bottom Bracket Instructions here

Older Post
Newer Post
Close (esc)

COVID-19 Update

We are taking extensive precautions to protect our employees and follow CDC and state guidelines. We are still shipping product and are still here to help and support bike shops during this difficult time.


-Chris King Precision Components

Age verification

By clicking enter you are verifying that you are old enough to consume alcohol.

Search

Shopping Cart

Your cart is currently empty.
Shop now