Shimano SM-BB92-41B Bottom Bracket
To get the greatest performance out of your Shimano XTR M900 or M9020 crank set, you are going to need a genuine Shimano bottom bracket. Shimano SM-BB92-41B bottom bracket fits mountain bike frames with shells fo 89.5 to 92mm in length are designed for crank spindles of 24mm diameters.
- Lightweight press-fit design
- For use with 24mm crank spindle
- Frame ID: 41mm
- Fits 86.5mm PF bb shells
- Weight 58g
Firstly, apparently I purchased the wrong size bottom bracket. I guess there are multiple BB92 widths? The listing said this was a XTR/Dura Ace Bottom Bracket...but when it showed up it only said Dura Ace...and wouldn't you know the center spacer wasn't wide enough. I bought this to use with a 68/72 Shimano Saint Crankset...guess there is a BB92 specific for that? Who knows...this BB standard is terrible.
I installed this BB sans plastic spacer since it was too narrow anyway. I was in a pinch and had a race the following weekend so I just figured it would get me through and I would just replace after the race (since it was the wrong one anyway). This BB pressed into the frame incredibly easily. I used a set of bench clamps (the ones that have the caulking gun handle to clamp stuff to a work bench). That in and of it self was a concern to me. I figured there was NO WAY the BB wouldn't creak. I practically could have used my palm to install these cups.
Cranks installed fine. Chainline was good. Then I rode my bike up the street. BB creaked right out of the gate. UGH! Again...can't fault the BB...I do fault the stupid BB92 standard. The creaking stopped about 5 miles into my race...but then came back again after I washed my bike. Then it stopped again. Annoying.
I ordered a Wheels MFG BB to replace this one. Hopefully it's the correct size and doesn't creek. Look for my review on the Wheels MFG BB after I get it installed.
PROS: Lightweight, Low Resistance
CONS: Creaked out of the gate but then stopped, Presses WAY to easily, Plastic cups?
9 months ago
PROS: It is an upgrade from the stock bb71
PROS: Affordable, Durable
Q & A
The bearings are included. They are pressed inside the cups on the ends of the shell (not pictured). The cups will press into the frame.
I'm not sure about the OD on the cups but the ID should work with the XT cranks you are using. I used this BB shell with a set of Saint cranks which have the same spindle diameter as the XT cranks.
Just make sure your bike is definitely BB92. If it is BB30 or PF30, I don't think this shell will work.
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