The Shimano FC-TY501 Tourney Entrance Chainwheel has 3 chainrings and is appropriate with 6, 7, or 8 velocity rear cassettes. This sq. built crank makes use of a BB-UN100 Backside Bracket. The chainring sizes To be had are 24-34-42T. To be had in Arm Lengths of 170mm and 175mm in Black.