Sram`s lightest, stiffest, and most accurate integrated power meter and chainring combo just got lighter with a new carbon crankarm construction - 29 grams lighter than previous generationPower readings are accurate within +/-1.5% and arent affected by climate conditions during a rideX-Range gearing technology gives you more range and a smoother gear progression, so youre always in the right gearPower meter is fully integrated into the chainring for lighter weight50/37T, 48/35T and 46/33T chainring combos availableDUB bottom bracket adds durability and simplicityMeasures right and left leg power balanceCrisp and accurate front shifts170x50/37DUBBLKDirect Mount2x12UPC/EAN/GTIN: 710845899256