Origin-8's Trackstar Crankset is made of light and durable forged aluminum and features a stylish machined-aluminum 46-tooth 1/8-inch chainring for excellent power transfer on the road and track. - Single speed crankset - Forged AL6061-T6 alloy crankarms - CNC alloy 1/8" 46 tooth chainring - 42mm chainline with 103mm JIS BB