For 12-speed, Aluminum Direct Mount, with Power Meter, Set Number of teeth 35 , 48 Article Type Fastening Direct Mount Group Affiliation SRAM Main color black Secondary color silver Rear derailleur speeds 12-speed Front derailleur speeds 2-speed This SRAM Red AXS Powermeter kit offers the ultimate integrated power measurement and adds Quarq technology to the one-piece chainrings for the lightest, stiffest and most accurate power package available. A 13-tooth step on all chainring combinations ensures precise shifting in any setup, as well as a less dramatic change in cadence when shifting up. X-Range gearing technology offers more range and smoother gear changes Power meter is fully integrated into the chainring for lower weight Power measurements are accurate within +/-1.5% and are not affected by weather conditions Measures the power balance of the right and left leg For sharp and precise front shifting Unique chainring shape results in a lighter, stiffer, more durable unit SRAM Article number: 735577 EAN code: 710845904745 Supplier number: 00.3018.387.001 Retail packaging: Yes