Lightweight InsulationLightweight Insulation

XTR. These three letters stand for Shimano's best, even with components as simple as modern Bottom Brackets like the M-BB93. This English-threaded BB is incredibly light, sealed for mucky conditions, and spins freely for top performance. It fits 24mm crank spindles and comes with spacers for compatibility with 68mm and 73mm shells.

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Shimano XTR SM-BB93 Bottom Bracket

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Here's what others have to say...

Thanks, Rico!

I'm looking for the most...

Posted on

Thanks, Rico!

I'm looking for the most durable bottom bracket for my bike, which has the Shimano M542 crankset. Are there more reliable (better) bottom brackets that you would recommend?

Responded on

Well it depends on the money you want to spend, I would say the Chris King is the most reliable BB we stock at this point. I have put those on a lot of endure and DH bikes with no problems. I have seen the SRAM BB's blow out on Enduro and DH bikes from very avid endure DH riders.

You have to consider how many times you have broken your BB if you break it a lot it will even out because you will be buying it twice as much. Spending more now could save in the long run.

I hope this answers your question if you want to talk more about it email me directly at

Will this fit a Shimano M542 crankset?

Posted on

Will this fit a Shimano M542 crankset?

Responded on


The answer is yes those cranks have a 24mm axle diameter which this BB excepts.

Let me know if you have anymore questions, at