Shimano Deore XT BB-MT800-P Press-Fit Bottom Bracket
Bottom Brackets
Shimano Deore XT BB-MT800-P Press-Fit Bottom Bracket
Shimano Deore XT BB-MT800-P Press-Fit Bottom Bracket
If your frame has a 41 mm press-fit shell measuring 89.5 mm or 92 mm across, yes. Read the overview
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Overview
Will the Shimano Deore XT BB-MT800-P Fit My Press-Fit Frame?
If your frame has a 41 mm press-fit shell measuring 89.5 mm or 92 mm across, yes. That covers the vast majority of press-fit mountain frames, and it is the same interface most manufacturers call BB92. The BB-MT800-P is the Deore XT tier of Shimano's press-fit range, built for 24 mm Hollowtech II crank spindles, which means it also works with FSA MegaExo, Race Face EXI, and Surly OD cranks that share the 24 mm standard.
What you get for the XT designation is Shimano's higher grade sealed bearing and a cup design meant to survive weather rather than just spin nicely on a workbench. It weighs 68.2 grams and comes with three 2.5 mm spacers so you can set chainline correctly across different shell widths. Press-fit bottom brackets need a proper press for installation and a bearing puller for removal, so if you do not have both, this is a job worth handing to a shop.
All the specs
MPN IBBMT800PA
- MPN
- IBBMT800PA (89.5/92mm), IBBMT800PC (104.5/107mm)
- Model
- BB-MT800-P
- Series
- Deore XT
- Type
- Press-fit
- Bottom bracket shell inner diameter
- 41 mm (PF41)
- Shell width options
- 89.5/92 mm or 104.5/107 mm
- Frame interface
- BB89.5, BB92, BB107
- Spindle interface
- 24 mm Hollowtech II
- Crank compatibility
- Shimano Hollowtech II, FSA MegaExo, FSA MegaExo Light, Race Face EXI, Surly OD
- Bearings
- Sealed cartridge
- Weight
- 68.2 g (89.5/92 mm)
- Color
- Black
In the box
- Spacers
Good questions
Get to know Shimano
There's more to Shimano than this one product. Our Shimano page has the full Shimano lineup we carry and more about the brand.
Visit the Shimano page →Which shell width do I need?
Measure your bottom bracket shell. The inner diameter needs to be 41mm. Then measure the width: 89.5mm or 92mm takes the narrow option, commonly labeled BB92. 104.5mm or 107mm takes the wide option, which is typical on fat bikes and some wide-shell frames. If your shell is threaded, you need the BB-MT801 instead.
Will this work with non-Shimano cranks?
Yes. It is built for 24mm Hollowtech II spindles, which also covers FSA MegaExo, FSA MegaExo Light, Race Face EXI, and Surly OD cranks using the same 24mm standard.
What is the difference between this and the XTR version?
The XTR SM-BB94-41A weighs 58g against this one's 68.2g in the 89.5/92mm size and uses a revised seal design. Fitment and crank compatibility are identical, so the difference is weight and bearing grade. XTR is only offered in the narrow shell width.
Are spacers included?
Yes, spacers come in the box for setting chainline across different shell widths.
Can I install this myself?
Not by hand. Press-fit cups need a proper bottom bracket press to install squarely and a bearing puller to remove. Installing them with anything else risks damaging the frame shell. If you do not have both tools, have a shop do it.
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