Hope 40t-REx (40t ratio expander) allows you to upgrade your existing 11-36 10spd cassette to give an 11-40 range

• 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
• Available in black, silver or gold hard anodised finish
• Weight: 74g