Ideal for mountain bikers or home mechanics replacing a worn PF41/BB92-style bottom bracket for a Shimano 24 mm MTB crankset.
The Shimano DEORE XT BB-MT800-PA is a press-fit bottom bracket built for frames with an 89.5/92 mm shell width and a 41 mm shell ID, using Shimano’s 24 mm MTB crank standard. It’s the right choice when you want a genuine Shimano fit for a compatible mountain bike frame without overcomplicating your build.
On the trail, what matters is smooth pedalling and dependable sealing, and that’s exactly where this unit makes sense. The sealed bearing design and wide bearing stance of HOLLOWTECH II are aimed at solid crank support and efficient power transfer, while the low 58 g average weight keeps things tidy for riders chasing a reliable replacement or a sensible fresh build.
Buy this if your bike is built around a PF41 / BB92-style MTB shell and you want to stay with a Shimano-compatible system. It suits a big spread of Shimano MTB cranks, including many DEORE, SLX, XT and CUES 24 mm options, but it is not the right bottom bracket for threaded frames, road PF86.5 shells, or SRAM DUB / 30 mm spindle cranks.
Made for 24 mm Shimano MTB cranks
Designed to suit Shimano MTB cranksets that use the 24 mm HOLLOWTECH II spindle standard, so matching the rest of your drivetrain is simple.
Fits 89.5/92 mm press-fit shells
Built for compatible MTB frames with an 89.5 or 92 mm shell width, making it a direct option for many modern trail, XC and hardtail frames.
41 mm press-fit standard
This bottom bracket suits PF41-style MTB shells, so shell diameter matters just as much as shell width when you’re checking fit.
Sealed bearing construction
High-quality sealed bearings help keep out water and trail grime for smoother running and less day-to-day fuss.
HOLLOWTECH II support
Shimano’s wide-set bearing layout supports the axle securely for stable pedalling feel under load.
Light overall package
At an average 58 g, it keeps weight low without stepping away from a practical OEM-style design.
Useful Shimano MTB compatibility
This model is listed across a broad range of Shimano MTB and CUES crank applications, which makes it a handy replacement part when you want to stay in-system.
General
Compatibility
Materials & construction
Features
Technology
HOLLOWTECH II
This design pairs Shimano’s integrated axle concept with a wide bearing stance to help you get efficient power transfer, solid pedalling stability and long-lasting rotating performance.
Press-Fit Bottom Bracket
Press-fit construction supports the axle with wide-set bearings to keep pedalling efficient, making it a smart choice if you want smooth rolling performance from a compatible press-fit frame.
Great for
Maybe not for
Check three things before ordering: press-fit frame, 41 mm shell ID, and 89.5/92 mm shell width. This bottom bracket is for Shimano 24 mm MTB cranks and Shimano’s current compatibility documents also pair it with a range of CUES, DEORE, SLX and XT cranksets. The dealer manual shows the assembly includes left and right cups, an inner cover and a 2.5 mm spacer, with a note that some models do not need spacers.
vs Shimano Deore BB-MT500-PA
A cheaper Shimano press-fit option in the same 89.5/92 mm x 41 mm category. It suits the same shell standard, but the XT-level BB-MT800-PA is the lighter option.
vs SRAM DUB BB92 89/92 mm PressFit MTB Bottom Bracket
A direct rival for the same style of MTB frame shell, but built for SRAM’s DUB spindle standard instead of Shimano’s 24 mm spindle.
vs Race Face BB92 24mm
Another PF41/BB92-style MTB bottom bracket for 24 mm spindles. It’s a sensible alternative if you’re mixing brands, but this Shimano unit is the cleaner pick when you want to stay with Shimano MTB crank compatibility.
Measure the frame before you buy
The shell needs to be press-fit, 41 mm internal diameter, and 89.5 or 92 mm wide. If any one of those numbers is off, this is the wrong bottom bracket.
This is an MTB press-fit unit, not a road one
It’s easy to confuse PF86.5 road and 89.5/92 mm MTB standards because both can use a 41 mm shell. Width matters here, so check your frame spec carefully.
Match the spindle, not just the brand
This model is for 24 mm Shimano MTB cranks. If you’re changing to SRAM DUB or a 30 mm spindle crank, you’ll need a different bottom bracket altogether.
Good choice for Shimano crank replacements
Shimano’s current compatibility charts pair this bottom bracket with a broad range of 24 mm MTB cranksets, so it’s a practical replacement if you’re refreshing an older bike or finishing a new MTB build.
Shimano is a Japanese component brand founded in 1921 in Sakai, Osaka. The company began with bicycle component manufacturing and has grown into a global business focused on bicycle components, fishing tackle and rowing equipment, while keeping its headquarters in Sakai.
In cycling, Shimano is best known for building complete component ecosystems that span road, mountain, gravel, commuting and e-bike use. Its range covers drivetrains, brakes, wheels, pedals, shoes and related parts, and the brand has had a long presence in Australia through a local business established in Sydney in 1992.
