in the "build kit" at this time, iro offers a black crank labelled "rpm" for the 165 and 170 length option, and the "iro" crank for the 175 length option. this begs the question: does anyone know how the rpm crank compares to the iro crank? or how the rpm cranks performs in general? thanks.
RPM is pretty standard on a lot of entry level Fixies. I think Fuji has the Truvativ (double converted for SS) crank now, but they used to have RPM's on them. There's nothing special about them, but I haven't heard of any issues (similar to the IRO crank).