Our most advanced aluminum cranks meet our most accessible power measurement. Get the data you need to progress, integrated into a light, stiff and strong crankset that features our X-Range shifting. FEATURES: Spindle-based unit measures left side power to calculate total watts Long battery life (400+ hours) to power a season of rides User replaceable AAA lithium battery DUB bottom bracket adds durability and simplicity Waterproof (IPX7 waterproof to 1 meter for 30 mins) Lightweight (less than 40g heavier than standard crankset) Crisp and accurate front shifts Integrated one-piece chainrings Available in 46/33T and 48/35T chainring combos SPECS: Speeds: 12 BB Compatibility: All SRAM Road DUB BBs Chainring Size: 46/33T, 48/35T Crank Arm Length: 160mm, 165mm, 170mm, 172.5mm, 175mm Chainline: 45.0mm BB Spindle Interface: DUB Chainring Material: Aluminum Guard: No Guard Bolt Circle Diameter (BCD): Direct Mount (DM) Crank Arm Material: Aluminum Color (Crank Arm): Black Power Meter: Yes Power Meter Type: Spindle Bottom Bracket Technology: n/a