Shimano XTR M952 Bottom Bracket
With Shimanos XTR range you come to expect light but expensive components, we put this BB on a bike to see if this was the case and to all see is the extra money bough reliability.
After a couple of weeks riding round on it we found it to be pretty good, it felt smooth right from the start and this carried on even after riding it in some very wet and muddy conditions. However after a couple of months we found that the seal did start to leak. We also had a few problems with the crank bolts working loose but a bit of lock tight soon sorted this out. The major advantage that we found with this BB is that it is actually serviceable so when the seal do go you can get in and sort it out. However the main draw back is that it can be quite fiddly to fit let alone service. In our opinion we would stick with the XT version as the extra money doesn’t make it more reliable.