SRAM RED XG-1290 Cassette - 12-Speed 10-28t For XDR Driver Body Rainbow E1 Weight-179g It features a windproof top

It features a windproof top and a very thin palm made of the highest quality Clarino for good feel and grip

Color Black Defined Color Black ISO Diameter 406 / 20" BMX Labeled Size 20 x 2

which is optimized for SRAM Flattop chain

model base spindle interface 30mm shell PF30 shell ID 46mm width 68/73mm color orange

SRAM RED XG-1290 Cassette - 12-Speed 10-28t For XDR Driver Body Rainbow E1 Weight-179g It features a windproof topDesigned for smooth and fast shifting Gradual gear progression between cogs at least five one tooth jumps on 10 28T, 10 30T and 10 33T cassettes while still offering a wider range 10 tooth start helps provide a wider gearing range Designed to work with an XDR driver body One piece machined steel X DOME design for weight savings SRAM Model ID: CS XG 1290 E1 TECH SPECS Cog Details 101112131415161719212428 Speed 12 Finish Rainbow Cog Material Steel