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Merlin Cycles£22.99Visit shop Shimano Black Mt801 Bottom Bracket Cups - / English (Bsa) / 68Mm/73Mm
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Frasers£33.00Visit shop Shimano Mt800 Hollowtech Ii 68/73Mm Bottom Bracket Bb -
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The Shimano BB-MT800 HollowTech II bottom bracket is an essential upgrade for mountain bikers using FC-MX70 or MX71 chainsets on 68 mm frames who prioritize weight reduction and reliable protection against trail debris. This bottom bracket features an advanced, lightweight seal structure that ensures smooth rotation and long-term durability in harsh conditions. While it is highly effective at keeping out dirt and water, riders should note that this specific variant is precision-engineered for 68 mm shells, meaning it may not be suitable for wider bottom bracket standards without proper adjustment or compatibility checks.
| Model Part Number | BBMT800SB |
|---|---|
| Brand | Shimano |
This specific BB-MT800 variant is designed for 68 mm shells; please check for specific 73 mm compatible versions if your frame requires it.
You will need a standard external bottom bracket tool compatible with the Shimano HollowTech II interface.
Yes, the kit includes the left and right cups, spacers, inner cover, and inner O-rings.
No, this is specifically designed for use with FC-MX70 and MX71 chainsets.
The sealed design is meant to be maintenance-free, but it should be inspected if you notice any play or unusual resistance in the crank rotation.
Remove the cups, clean the threads, re-grease, and re-install to the correct torque specification.
Check for debris caught behind the crank arms or within the seal area; ensure the inner cover is correctly seated.
Verify the frame shell width is 68 mm and ensure the threads are not cross-threaded or damaged.
Installation of the BB-MT800 requires a dedicated HollowTech II bottom bracket tool to ensure the cups are torqued to the manufacturer's specifications without damaging the threads. Before installation, clean the frame's bottom bracket shell thoroughly and apply a light coating of anti-seize or grease to the threads to prevent long-term fusion. This model is strictly designed for 68 mm frames; ensure your frame shell width matches before attempting installation. To maintain the unit, avoid high-pressure water washing directly at the bearing seals, as this can force moisture past the protection layer. Periodic visual inspections for external debris buildup are recommended to keep the seals functioning optimally.
