• Took apart a UN55 non-drive side for the heck of it (currently job hunting...), pretty easy to do if you have 2 or 3 spoke width picks, or finer.

    First pic is a black plastic retainer cap that fits tight over the axle and holds down a rubber dust cap. Note the pick marks from where I pried it off; would recommend using multiple picks and a flat tool like a c Hh sim checker to gently lift it around the circumference of the axle like a tyre off a rim. Note which side goes down because if you reinstall it wrong it’ll create loads of drag.

    Second and third pics are inside of the cartridge: the grey/white plastic you see is the bearing retainer, which lifts off easily exposing the bearings. You can clean them out and regrease, but they don’t come out of the BB from non drive side.

    Drive side axle has a tough retaining ring, possibly steel, pressed tight onto the axle. Couldn’t pry it out but didn’t force it.

    Putting it back together is easier than taking it apart, just be careful with that black cap.


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  • Praxis 22/24 mm bb question. i have installed one last night with the plastic protective sleve backwards i.e.flange side of the sleve into nds cup, everythings seems smooth, is it ok, or do i need to take it apart ? It was a loose fit either way and didn't bother reading the instructions...

  • Is there alternatives for SRAM DUB bottom bracket (SRAM NX Eagle 12 Speed Mountain Bike Groupset)?

  • Rotor track cranks. Are the ROTOR track BB cups slightly narrower than normal (i.e Hollowtech) 24mm road BB's?

    Would i need to use the Rotor specific BB to get the right chainline or can i use other cheaper options?

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Transmission database - for all your crank / bb / bottom bracket questions

Posted by Avatar for kowalski @kowalski

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