Sturmey Archer FCT64 Single Speed Crankset with 7075 alloy crank arms (170mm crank arm length), bolt circle diameter: 144mm, colour: silver polished. Wide track chainring for 1/2 x 1/8" chains made of 6061 alloy with 44 teeth, colour: silver polished, silver steel chainring bolts, total weight: approx. 656g. Compatible with JIS square taper bottom brackets (not included!). With a bottom bracket with 103mm axle length this crank has a chain line of 42mm and with a 107mm axle you get a chainline of 43,5mm.