need some help!
I am looking into buying the parts to convert my bike to fixed gear. My bicycle has 126mm spacing in the rear dropouts, and i believe requires a 68mm shell for the BB. I would like to purchase the bulletproof cranks. In order to get a straight chain line what spindle length should i get the BB in? would 107mm be ok? also, will the bulletproof cranks fit any taperd square bb, (for instance the one made by IRO) without any type of conversions etc? And for the final question- I live in san francisco, ride long distances and of course there are lots of hills, whats is good gearing for an area like this?