TheHope T-Rex Ratio Expander Sprocket 40T allows you to upgrade your existing 11-36, 10 Speed cassette to give an 11-40 range. Hope T-Rex Ratio Expander Sprocket 40T Features Adapts a 11-36 10spd cassette to give an 11-40t range T-REX ring installs behind existing cassette, replacing one of the smaller sprockets, usually 17t Shimano and Sram specific tooth profiles and shifting Precise matching of the tooth profiles and shifting points specific to each cassette Perfect mating of supporting tabs reducing flex and aiding shift performance Lower B-tension adjustment is needed ensuring good shifting throughout the cassette range compared to fitting a 42t Compatible with Shimano XT and XTR 11-36 10spd cassettes and Sram PG1030, PG1050 and PG1070 11-36 cassettes Shimano and Sram specific 40t sprockets have been designed allowing benefits that wouldn't be possible with a larger sprocket size or with a universal type design Hard anodized 7075 T6 aluminium More info
