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SRAM s 43/30T chainring combo combined with a wide chain line increases tyre clearance while providing ideal gearing for venturing off-road. But gravel riders need power measurement too, so SRAM have elegantly integrated Quarq technology into the DUB spindle, stealthily gathering the data you need to progress.DUB-PWR spindle-based unit measures left side power to calculate total wattsProven Quarq reliability and accuracyLong battery life (400+ hours) to power a season of ridesUser replaceable AAA lithium batteryDUB bottom bracket adds durability and simplicityWaterproof (IPX7 waterproof to 1 meter for 30 mins)Lightweight (less than 40g heavier than standard crankset)Wide chain line crankset for bikes with up to 700x45c or 27.5x2.1 tyre widths (43/30T chainrings only)