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