BB30 BB Grev

When bearings press directly into the frame it is important that the bearings are of the highest quality and the bearings in the BB30 are exactly that. They are highly polished so they are smooth to spin and last a long time. The seals on the bearings protect the bearings and races from dirt and water that try to make their way in.

https://www.tokenproducts.com/images/bb90/BB30_Manual.pdf