The SRAM Apex DUB Left Crank Arm and Power Meter is a DUB-PWR spindle-based left-side power meter that provides accurate wattage to help our road cycling performance. This 12-speed crank delivers +/- 1. 5% proven Quarq accuracy, a superior battery life of over 400 hours, and an IPX7 waterproof...

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SRAM's Rival AXS left Arm Power Meter offers reliability and accuracy, packaged in a sophisticated design. The most discerning of road cyclists can take advantage of the long, 400-plus-hour battery life and proven Quarq reliability and accuracy to calculate total watts and delve into the minute...

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