Originally Posted by Schmiegle

Would 120mm spindle length be a good length to order if I want to set the bike up for single speed?

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Originally Posted by Scrodzilla

The spindle length always depends on the crankset being used, not the frame. If the Paul crank calls for a 111mm ISO spindle, that's what you should use.

If you really want a Phil BB, you should use a 110mm ISO (as they don't make 111mm).