Shimano BB-MT801 Bottom Bracket - 68mm BSA
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eBaySHIMANO BB-MT800-S bottom bracket for FC-MX70 MX71 HollowTech II chainset, 68 mm
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Product Information
Full details
The Shimano BB-MT801 Bottom Bracket is designed for cyclists seeking reliable and durable performance for their mountain bike setups. Its key benefit is a maintenance-free, sealed design that effectively repels dirt and water, ensuring smooth operation and longevity. A potential caveat is its specific compatibility with FC-MX70 / MX71 chainsets and 68mm BSA shell frames.
All features
| Model Part Number | PL-IBBMT801SB-4550170641535 |
|---|---|
| Brand | Shimano |
Extended Product Information
FAQs
What chainsets is the Shimano BB-MT801 compatible with?
This bottom bracket is specifically designed for use with Shimano FC-MX70 and FC-MX71 chainsets.
What type of bottom bracket shell does this fit?
It fits a 68mm British Thread (BSA) bottom bracket shell.
Is this bottom bracket maintenance-free?
The sealed cup design significantly reduces maintenance by keeping out dirt and water, but periodic checks for play and tightness are still recommended.
Does it come with all necessary parts for installation?
Yes, it includes the left and right hand cups, spacers, inner cover, and inner O-rings.
Can I use this on a 73mm bottom bracket shell?
No, this specific model is designed only for 68mm bottom bracket shells. Spacers may be included for minor adjustments within the 68mm standard, but it will not fit a 73mm shell.
How do I clean the bottom bracket?
Clean the exterior with a damp cloth. Avoid using high-pressure water jets directly on the seals to prevent damage.
Troubleshooting
Bottom bracket makes noise (creaking, grinding)
Ensure the bottom bracket cups are properly tightened to the frame and the crankset is correctly installed and torqued. Check for any debris trapped between the cups and the frame. If noise persists, the bearings may be contaminated or worn, requiring replacement.
Excessive play in crankset
Verify that the crankset pinch bolts are tightened correctly. Check that all spacers and the inner cover are correctly installed. If play remains, the bottom bracket bearings may need adjustment or replacement.
Difficulty installing cups
Confirm you are using the correct bottom bracket tool and that the frame's bottom bracket shell threads are clean and free of damage. Ensure you are threading the cups in the correct direction (drive-side clockwise, non-drive side counter-clockwise).
Pros and Cons
Pros
- Durable and long-lasting construction.
- Sealed bearings provide excellent protection against the elements.
- Lightweight design contributes to overall bike efficiency.
- Simple to install and maintain.
- Genuine Shimano quality ensures reliable performance.
Cons
- Limited compatibility, primarily for specific FC-MX70 / MX71 chainsets.
- Requires a 68mm BSA threaded bottom bracket shell.
- May not be suitable for all mountain bike frame standards.
Setup, Compatibility & Care
Setup: Ensure your bicycle frame has a 68mm British Thread (BSA) bottom bracket shell. Install the drive-side cup (marked R) first, threading it into the frame. Then, install the non-drive side cup (marked L). Use appropriate bottom bracket tools for installation and torque to manufacturer specifications. Install the provided spacers and O-rings as per the chainset manual.
Compatibility: This bottom bracket is specifically designed for Shimano FC-MX70 and FC-MX71 chainsets. It is only compatible with bicycle frames featuring a 68mm British Thread (BSA) shell.
Care: The sealed nature of the BB-MT801 requires minimal user care. Periodically check for any play or noise. If cleaning is necessary, use a damp cloth to wipe down the exterior. Avoid high-pressure washing directly at the seals, as this could compromise their integrity. Regular checks for tightness are recommended.