Originally Posted by
dayvurd
so if youre saying that they need to be close to 42mm from the centre. would it be better for me to put the bottom bracket back on the frame, with the cranks and measure how long that is? and then just buy a new shorter one? or is that just a bad idea
That is a perfect plan. See below.
Originally Posted by
SquidPuppet
Okay, so the two weren't already together?
If you want to use that crank you need to figure out the right spindle length
for the crank. The frame has nothing to do with what length spindle you need. Since you have no way to contact the crank manufacturer, your task is a simple one.
Install the bottom bracket into the frame. Install the drive side crank arm and fully torque it down. Now take a chain line measurement. It will probably be far from 42mms. Then just do the math to determine how much shorter a spindle you need. Easy, just a little time consuming.
This is assuming that you are running a real single speed freewheel or track hub and cog in the rear. Which would both be at approximately 42mms from center.