About SRAM Red E1 XG-1290 10-30 12 Speed Cassette Rainbow
Wide range and tight jumps? Why not both? SRAM's lightest, most durable cassette breaks new ground for gearing choices as well. Four distinct cassette options, including SRAM's first 10-30T and 10-36T RED cassettes, each provide secure shift ramps specifically designed for electronic shifting, whether racing road on a 10-28T or creating an all-road setup with a 10-36T. Carefully chosen tooth jumps keep you in the right gear when you’re out of the saddle on steep climbs and making fine changes to hold a wheel while approaching a sprint.

Features
Designed 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

10-30T and 10-36T options available in RED for the first time

Designed to work with an XDR driver body

One-piece machined steel X-DOME design for weight savings

Available in 10-28T, 10-30T, 10-33T and 10-36T

Specifications
Speed (CS): 12s

Gearing: 10-30t

Cog Finish (Cassette): Rainbow

Technology (Cassette): XG

Cog Sizes: 10-30t: 10,11,12,13,14,15,17,19,21,24,27,30

Weight (g): 180

Weight Based On: XG1290 10-28

About SRAM
Founded in 1987, SRAM (an acronym of the 3 founders names, Scott, Ray and Sam) is a privately owned bicycle component manufacturer located in Chicago. They're known for developing many of the inovative technologies used in bikes today including ETAP wireless electric shifting, Grip Shift, dedicated single chain ring drivetrains, narrow wide chainrings and more. Sram also own bicycle component brands Rockshox, Quarq, Zipp and Truvativ.