Shimano
XT MT800 English Bottom Bracket
Best reliable upgrade for mountain bikers seeking smooth, efficient drivetrain performance.
Elevate your cycling experience with the Shimano XT MT800 English Bottom Bracket. Engineered for exceptional performance and lasting durability, this component ensures smooth, efficient power transfer for every ride. Its robust construction guarantees reliable rotation, making it an ideal upgrade or replacement for your bike. Designed with the trusted Shimano XT quality, it provides a solid foundation for your drivetrain, offering dependable performance mile after mile. The standard English threading ensures straightforward installation on compatible frames, bringing renowned Shimano reliability to your bicycle.
$38.99
Owner Satisfaction
4.7
/ 5
Category Rank
68
/ 2100
#68 in Components
Price vs Category Average
-62%
Below average
Model Number
800
/ IBBMTB
Who it's for
- Mountain bikers riding in wet or muddy trail conditions
- Performance riders seeking efficient power transfer and smooth pedaling
- Mechanics needing a standard fit for most Shimano cranksets
Who should skip it
- Riders wanting a long-lasting component that avoids frequent maintenance
- Home mechanics lacking specialized bottom bracket installation tools
- Budget-conscious cyclists looking for the most affordable replacement option
Performance breakdown
Bearing Smoothness
High-quality seals provide exceptionally low friction for efficient power transfer.
Installation Simplicity
Standard English threading makes home maintenance straightforward for most riders.
Durability
Rugged construction withstands heavy trail abuse and harsh weather conditions.
Drivetrain Compatibility
Seamlessly integrates with the wider Shimano XT ecosystem for optimal performance.
Weight Efficiency
Optimized design keeps rotational mass low without sacrificing structural integrity.
Sealing Performance
Advanced labyrinth seals effectively block dirt and moisture from internal components.
Key Specs
Model Number
IBBMT800B
Thread Standard
English
Brand Quality Tier
XT
Features
- Ensures smooth, efficient power transfer
- Engineered for long-lasting durability
- High-quality Shimano XT performance
- Designed for reliable rotation
- Standard English thread compatibility
- Dependable Shimano quality
What customers say
The Shimano XT MT800 bottom bracket earns high praise for its exceptional durability and smooth operation. Cyclists consistently report robust construction capable of handling demanding mountain biking conditions. A key highlight is the remarkable bearing smoothness, which immediately enhances pedaling efficiency and reduces friction compared to lower quality options. Installation is generally straightforward for experienced users, fitting perfectly into English threaded frames. While priced above budget alternatives, the consensus is that the MT800 delivers excellent long term value due to its reliable performance and minimal maintenance needs. It is widely regarded as a dependable, high performance component that lives up to the respected XT standard.
Know before you buy
This bottom bracket is designed for frames with a standard English threaded shell, which is the most common interface for mountain bikes. If your frame uses a press-fit system, this model will not be compatible.
Yes, the MT800 typically includes the required spacers to ensure proper fitment across various shell widths, such as 68mm or 73mm configurations.
The XT-level MT800 features improved sealing and higher-quality bearings compared to entry-level options. These upgrades result in smoother rotation and better protection against water and grit, extending the lifespan of the component.
You will need a specific bottom bracket tool compatible with the Shimano Hollowtech II standard. Because the MT800 uses a smaller bearing cup diameter than older standards, you may also need a plastic adapter tool to fit your wrench to the cups.
The MT800 is specifically engineered for Shimano Hollowtech II cranksets with a 24mm spindle. It is generally not compatible with cranksets from other brands that use different spindle diameters or proprietary interfaces.
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