Background: Installing a Shimano Ultegra BB-6500, 105x68 into a Felt B2 frameset (shell--68mm). Well, minor difficulty...
When I put the drive side cartridge in, flush with the shell, and then put the non-drive cup in--it doesn't sit flush:
So, who's at fault--the BB, the BB shell, or ME? I won't rule out myself, as this is my first BB install, but what's there to mess up!? Did I miss something?
The exterior of the BB shell measures 68mm. And the BB itself won't "collapse" to less than ~69mm. In the pic below I took the BB shell measurement and compared it to the BB:
Finally, a possible patch: bottom bracket spacer. Any problems with this?
Any thoughts? Thanks in advance..