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Item # SHI000Z

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Item # SHI000Z


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.

  • Tough, lightweight
  • Fits 24mm spindles
  • Compatible with 68mm and 73mm BB shells

Tech Specs

aluminum, steel
Shell Width:
68 mm 73 mm
Axle Type:
Recommended Use:
Actual Weight:
Black, English: 89g

Community & Reviews

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Shimano XTR SM-BB93 Bottom Bracket

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Here's what others have to say...

4 5

Good so far

  • Familiarity: I've used it several times

I upgraded from XT since these were on sale. I can't tell a noticeable difference in performance, so at this point I wouldn't pay any extra for XTR.

BB Installation Tool Adaptor

The bottom bracket comes with an adaptor to fit the cups for installation. It slides right into a Shimano bb tool and then onto the bb cup.

BB Installation Tool Adaptor

BB93 Cup Size

Here is a photo showing the smaller size difference between the BB93 and the previous iteration of the XTR bottom bracket that worked with the M980/M985 crankset.

BB93 Cup Size
4 5

Smaller cups than XT

  • Familiarity: I've used it once or twice and have initial impressions

Don't freak out when this arrives thinking it's the wrong size. The cups are much smaller and it comes with an adapter for your normal BB tool for installation. It just covers the BB opening in the frame.

Does it comes with the TL-FC32 tool?

Responded on

HI Gerson,

This bottom bracket does not include an installation tool. We have a good selection of both socket and wrench-style external bottom bracket tools. Give us a call or chat in to place your order, and we will get you the right tool!

Does it fit a Shimano XT FCM780 Crankset?

Responded on

Hi Gerson,,

This Shimano bottom Bracket will work with all Shimano Hollowtech cranksets, including the Shimano XT FCM780 crankset.

Thanks, Rico!

I'm looking for the most...

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?

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