Is there a detriment to the crank arms being that way w/ the bb? That's my main concern... I do not feel any grinding... I don't feel any friction, the arms spin well for me and I've been thru the cadence band of 50 to 120 without a problem. If it's fine as is I have no issues, I just don't want to have a failure
Thanks for everybody's insight. BTW if it helps at all I bought it from a person who build it from the madone FRAME, it wasn't purchased stock from Trek or a Trek distributor.
Originally Posted by
Campag4life
Those technically are called bearing cups. Yes, external bearings reside inside those cups which are on the outside of the BB shell. The Trek BB is completely different. The BB shell is 90mm wide and not 68mm...hence its name BB90. Intent is to have bearings inside the very wide BB shell but pressed in like BB30 or PF30. As to crank spacing, the same long spindle external bearing crank like Ultegra or DA can be used in the Trek 90mm wide BB...only difference is the bearings are pressed into and reside within the BB shell versus on the outside as with an external BB shown.