More informationWide/narrow chainring for Sram Boost system.Made of CNC machined 7075-T6 aluminum, more durable and lighter.3 mm offset for a 52 mm chain line.Compatible with 9, 10, 11, or 12 speed transmissionsAvailable in 7 colors with laser graphics. Weight: from 57 gr to 80 gr. Measurements: 28T, 30T, 32T, & 34TColors: Black, blue, gold, lime green, orange, purple and red.