Anthem X lower pivot bearings

Anthem X lower pivot bearing

After about 6 months use the lower set of larger bearings on my Anthem X had started to wear out. You can see them in the picture - the new bearings are the ones with the orange rubber seals.

What bearings are needed?

The lower set of larger bearings on my Anthem X frames are 28mm outer and 15mm inner diameter and are 7mm wide. The normal bearing designation for these is 6902. Make sure you get the LLU type - the LLU designation means that these have double-lip contact rubber seals. Its a "labyrinth" seal type that offers better sealing, which is exactly what you want on suspension pivots immersed in mud and water.

How much will it cost?

The NTN 6902LLU/2AS bearings cost AUD$11 each at my local bearing shop. They had them in stock so it doesn't seem like they are a rare size that would need to be specially ordered.

What's the procedure?

You need to remove the rear triangle so:

  • take off the rear brake caliper;
  • take off the rear derailleur - leave it connected to the cable, just remove the derailleur mounting bolt;
  • remove your cranks - or at least the drive side crank;
  • undo the top retaining bolts;
  • undo the bottom pivot bolt.

Extracting the bearings

The bearings came out fairly easily by inserting an 8mm 1/2 drive socket through the bearing and using that to tap them out. You can support the outer edge of the swingarm using on older style bottom bracket bearing cup. It's the perfect size to let the swing arm bearing drop into.

Installing the bearings

I was able to press the bearings in using a 21mm socket which had a perfect outer diameter for the job.

Thoroughly clean the bearing bore and then coat the new bearing outer with some anti-seize. Make sure when you install the bearing that it goes in straight. If you press it in cock-eyed you run the risk of flogging out the bearing bore in the swing-arm. This would be an expensive mistake. Just take it slowly and carefully.

How long will it take?

All told its about a 30 minute job.

Related articles:

Real time clock (RTC) battery replacement

If you're getting a bios error on bootup about your "time not being set" or something similar, then its possible that your backup battery for the motherboard's real time clock (RTC) has gone flat.  In many motherboards ...

Hollowtech II bearing replacement

The bearings in hollowtech II and similar bottom brackets are described as "not user serviceable" and not user replaceable but with a little bit of bush ingenuity it can be done with as little as a bench vice and appropriately ...

Giant Anthem X lightweight build

I started with a Giant Anthem X3 2010 on runout that was cheaper to buy than a frame-only Anthem X. Other than the frame, there is nothing left.

A2Z rear hub replacement

I originally built this wheel with a Crest 32h rim and DT Swiss Supercomp spokes.  The A2Z rear hub has subsequently started to make some noise under heavy load.  It's still perfectly functional, but for ...

Adding v-brake bosses to rear triangle of Anthem X

Machine up a v-brake boss adapter from 4mm aluminium plate:

Anthem X rear triangles compared

What cost progress?