chainwheel and crank 1. competitive price 2. sound quality 3.all size 4.new style chainwheel and crank1.crank:89mm,102mm,127mm,140mm,152mm,165mm,170mm2.teeth:24T,26T,28T,32T,36T,38T,40T,42T,44T,46T,48T3.material:steel4.axle hole:cotterless5.Finish: ED OR CP