SRAM XG1290 E1 10-30 12s XDR RAINBOWGradual 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 Provides 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 One piece machined steel X DOME design for weight savings 10 30T and 10 36T options available in RED for the first time Designed for smooth and fast shifting even