Shimano BB-MT800 bottom bracket cups - English thread cups, 68 / 73 mm

You will need the Shimano TL-FC25 tool specifically designed for installing and removing HollowTech II bottom brackets.

No, it is only compatible with Shimano HollowTech II cranksets.

The Shimano BB-MT800 has sealed bearings and is designed to be maintenance-free. Regular greasing is not required. However, it's wise to inspect it periodically for smoothness and noise.

This bottom bracket is not compatible with shells other than 68mm and 73mm. You will need a different bottom bracket.

Clean the exterior with a damp cloth. Avoid using high-pressure water near the seals.

If you feel roughness or hear creaking during pedaling, or if there's play when you rock the cranks side to side, the bottom bracket may be worn and need replacing.

Check the bottom bracket cups for proper tightness. If loose, tighten them using the TL-FC25 tool. Also, check for any dirt or debris and clean the area.

The bottom bracket may be contaminated. Remove and clean the bottom bracket cups. Inspect the bearings for damage and replace if necessary.

Ensure you are using the correct TL-FC25 tool and that the bottom bracket shell threads are clean and properly greased. If the cups still don't thread smoothly, consider having a professional mechanic check the frame's bottom bracket shell.