Shimano
XT MT801 English Bottom Bracket
Best upgrade for mountain bikers seeking reliable, smooth drivetrain performance.
Elevate your cycling experience with the Shimano XT BB-MT801 Bottom Bracket, a robust component designed for optimal drivetrain performance. Engineered with an outboard-bearing design, it offers enhanced stiffness and smooth rotation for your 24mm spindle cranksets. The sealed bearings effectively prevent contamination, ensuring longevity and reliable operation. This bottom bracket is compatible with both 68mm and 73mm shell widths and features the renowned Shimano Hollowtech II interface. It includes all necessary cups, bearings, an inner sleeve, and spacers for straightforward installation, making it a superior choice for discerning riders.
$43.99
Owner Satisfaction
4.7
/ 5
Category Rank
68
/ 2100
#68 in Components
Price vs Category Average
-57%
Below average
Spindle Interface
Shimano Hollowtech II
/ Shimano Hollowtech II
Who it's for
- All-weather riders needing long-lasting, low-maintenance components
- Performance cyclists prioritizing efficient power transfer and stiffness
- Mechanics and riders seeking easy-to-source, universal frame compatibility
Who should skip it
- Home mechanics preferring to service and repack their own bearings
- Weight-conscious racers seeking the lowest friction and mass
- Beginners lacking specialized tools for external bearing cups
Performance breakdown
Drivetrain Stiffness
Outboard-bearing design provides exceptional power transfer for aggressive pedaling.
Bearing Longevity
Sealed construction effectively shields internal components from trail grit and moisture.
Installation Simplicity
Standardized interface and included spacers make setup straightforward for home mechanics.
Rotational Smoothness
High-quality bearings ensure minimal friction during every pedal stroke.
Frame Compatibility
Versatile design fits most standard mountain bike shell widths with ease.
Component Durability
Rugged build quality stands up to the demands of daily riding.
Key Specs
Spindle Interface
Shimano Hollowtech II
Shell Width Compatibility
68 or 73 mm
Color
Black
Model Number
IBBMT801B
Includes
Cups, bearings, inner sleeve, and (3) x 2.5mm spacers
Features
- Outboard-bearing design for superior stiffness
- Compatible with 24mm spindle cranksets
- Sealed bearings resist contamination
- Hollowtech II spindle interface
- Fits 68/73mm shell widths
- Shimano XT quality and reliability
- Includes installation hardware
- Smooth rotation and durability
What customers say
Customers overwhelmingly praise the Shimano XT MT801 for its exceptional reliability and impressive longevity. The robust sealing effectively protects bearings from dirt and water, ensuring a prolonged operational lifespan even in demanding conditions. Riders consistently report smooth, quiet performance right after installation, noting improved pedaling efficiency and reduced friction compared to other units. Installation is generally straightforward for those familiar with English threaded bottom brackets. This component strikes an excellent balance between premium performance and competitive pricing, making it a superb value upgrade. It is widely regarded as a dependable workhorse that delivers consistent, high-quality results for serious trail riders.
Know before you buy
Yes, this bottom bracket is specifically designed for 24mm spindle cranksets that utilize the Shimano Hollowtech II interface.
Yes, it is compatible with both shell widths. The package includes three 2.5mm spacers to ensure a proper fit regardless of your frame's specific shell size.
Yes, the kit includes the cups, sealed bearings, the inner sleeve, and the necessary spacers for a complete installation.
The outboard-bearing design places the bearings outside the frame, which allows for a wider stance and a larger spindle diameter. This significantly increases the stiffness of the drivetrain, resulting in more efficient power transfer.
The BB-MT801 features high-quality sealed bearings designed to resist contamination from dirt, water, and grit, which helps maintain smooth rotation and longevity even in challenging riding conditions.
Still have a question?
Ask Hayley anything about this product before you decide.