Sram`s lightest, stiffest, and most accurate integrated power meter and chainring combo is now on ForceX-Range gearing technology gives you more range and a smoother gear progression, so youre always in the right gearQuarq D-Zero technology is accurate to +/-1.5% and isnt affected by temperature changesUnique chainring shape results in a lighter weight, stiffer, more durable cranksetConsistent 13-tooth gap on the rings ensures fast and reliable shiftingPower meter is fully integrated into the chainring set for lighter weightDUB bottom bracket adds durability, simplicity and broad compatibilityMeasures right and left leg power balance170x50/37DUBBLKDirect Mount2x12