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gbj_tester
@keepit
Hello all, I'm having some challenges with a new GXP BB. I've installed many over the years (threaded and pf), and have never had any problems with them, despite the internet seeming to think they are the worst design ever dreamt up.
I'm now trying to install a threaded GXP BB, but on an Italian BB shell. I've ordered a SRAM ita BB and expected the cups to be a couple of mm narrower to make up for the 70mm shell width. However, when I compare to a bsa BB, the shells are exactly the same width.
I did the comparison, as when I tighten up the crank bolts even lightly, the crank rotation is very stiff. Upon inspection, it appears that the NDS splines perhaps don't stick out enough? I suppose this makes sense if the shells are the same width as bsa, as the axle should perfectly fit without spacers when the shell is 68mm?
Have I been sent a dud BB? The threads were fine, so it can't be a bsa one. Is there such a thing as a MTB-specific ita GXP BB that would reduce the need for spacers? I'm quite confused!
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