Salsa mtb * 3, Intense mtb * 1, Abeni SS rd * 1, Salsa road/touring * 2, Trek Damn one * 1, Vintage/projects * many
Should be no play if you have both seals in there. Sometimes you have to torque down the compression cap more than specified to seat the cranks and bearing seals, but you can usually back it off to spec. Your bearings may be moving around in the seat, this is a frame failure and you'll need to deal with Trek for a new frame.
Ahh... I was wondering about that. When I took out the bearing cartridges it felt almost loose in the frame. They should be a tight press fit right?
BB90 is slip fit, meaning you can remove and install the bearings by hand, without tools. However, the fit has to be within tolerances. Press fit is a pressed-in bearing that requires a tool to press the bearing in. It sounds like Trek has built some frames that are slightly out of spec and their solution is to supply a slightly different size "BB90" bearing assembly, maybe they should call those BB90 with an asterisk.
Yep. Preload is not the answer, the bearing needs to be larger. Trek has a couple flavors, one of which has a 0.05 sleeve over the outside (I put these in the freezer for a couple minutes just prior to installation, after having the sleeve crumple on one of them). The other is built with the outer race slightly larger in its own right.
Found this thread on a Google search. Couple of questions for those in the know. First, do these bearings have to be serviced or are they good to go "forever"? Should/could I remove the outer seal and regrease the bearings, or is that not necessary? Also, I have well over 10k miles on the bike, and have never had a problem with the BB, so is it safe to assume I have the "standard" non-oversized BB, or did Trek manufacture bikes out of the factory with the oversized ones? In other words, if I'm not having a problem, then must I have the standard BB? Thanks!