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:
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
Hard anodized 7075T6 aluminium
Available in black, silver or gold hard anodised finish
Weight: 74g
