I'm re-building an old Italian Bottecchia mountain bike which has Italian BB shell (70mm) and the previous bottom bracket was a square taper with 130mm spindle (measurement confirmed via calipers.)
I taken from an old Specialized (68mm shell) a Shimano fc-m341 crankset that I want to install in my new bike. That crankset was mounted with a shimano es-25 121 mm long.
My question is: which octalink v2 bottom bracket should I buy to fit my crankset on my project? I know I need an Italian threaded BB, but should I buy a 130mm, 121mm or 118mm spindle?
Due to the wider shell, I don't know if I have to buy a 130 mm as the previous square taper was, or a different size.