Originally Posted by
Uyle
I just receive my Colnago Sprint and found out that I can't ride it because the chainring touch the frame. When open, I see that the spindle is 68-ss when my BB is 70mm. Is it the reason the chainring touch the frame?
The position of the chainring, i.e. the chain line, is determined by the shape of the spider as well as the BB width. And the potentially bearing cups. Usually the required spindle length is specified for the particular crank, not the BB width per se. If the bearing cups can be adjusted okay then, as nf says, the BB width isn't necessarily a problem. But the overall length is a different spec.