Shimano CS-6600 Wide 10 Speed Cassette
Custom cassette sizes for junior bikes provide ideal gearing ratios for young cyclists. Note: . . Junior models that have 13-16T top gears might interfere with chain stays or seat stays of specific frames When mounting, make sure that it works properly before ridingg Do not use those models with WH-6600/WH-R600/WH-R601 wheels. 14-25, 15-25, and 16-27T are not designed for triple front drive systems, as shifting