SRAM RED XG-1290 Cassette - 12-Speed 10-28t For XDR Driver Body Rainbow E1 Model=Nano Tire Mountain versions for 73mm or

Mountain versions for 73mm or 68mm bottom bracket shells or Road specific versions for 68mm bottom bracket shells

and power transmission are certainly worth it

One-piece aluminum 2x chainring and carbon crankarms results in a lighter weight stiffer more durable crankset that provides crisp and accurate shifting

15 and 25 mm stack height top cover options  (6mm cover = 6mm total stack

The cap is designed for years of leak-free use

SRAM RED XG-1290 Cassette - 12-Speed 10-28t For XDR Driver Body Rainbow E1 Model=Nano Tire Mountain versions for 73mm orDesigned 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