I'm trying to upgrade my friend's bike with some RF isis cranks that i have. Does anyone know what size the BB is? I've been searching online for the info but can't find anything. I know that i need to find out whether it's a 68, 73 or 83. Then I need to figure out if a 113 would be okay. Thanks in advance.
You can't just measure the shell? IIRC most of the older RF isis cranks used a 113mm spindle. Could be wrong though, don't take my word for it.
Get a truvativ gigapipe 68/73, one BB for both shells, should be a 113, possibly a 118. you wont find that bike with an 83
