The Magene PES P515 is a dual-sided, spider-based road power meter chainset with the PES alloy crank, the 99 g 7075 aluminium P515 spider and a 52/36T 110 BCD chainring set ready to bolt straight on. Upgraded from the P505 with 1% accuracy, T47 and BB386 compatibility and a longer 330-hour battery life, it's a serious dual-sided crankset alternative to Shimano power meters at a fraction of the price - and a direct Hollowtech II swap for most road bikes. Key Features Dual-sided spider-based power measurement: spider-mounted strain gauges with intelligent temperature compensation deliver true left/right power data with 1% accuracy Built-in temperature compensation: tracks dynamic temperature shifts and corrects power readings, no drift on long climbs or freezing winter rides 330-hour battery life: rechargeable battery covers a full season of training and racing on a single charge 110 BCD 4-bolt chainring standard: wide compatibility with aftermarket chainrings and Shimano 12-speed compatibility for easy upgrades Magene QED chainrings included: 7075 aircraft-grade aluminium 4-bolt chainrings for crisp shifting and durable performance Triple hollow-channel alloy crank: CNC-machined PES alloy crank arm with deep-hole drilling balances stiffness and weight - tested to 100,000 hard pedal cycles 24 mm steel spindle: direct replacement for Shimano Hollowtech II cranksets - drop-in upgrade for most road bikes Opposing dual-bolt locking system: reduces non-drive-side crank loosening - a major improvement over previous Magene generations Bluetooth and ANT+ dual protocol: pairs with Magene, Garmin, Wahoo, Bryton, Hammerhead and any major head unit, plus Zwift, TrainerRoad, TrainingPeaks and Strava Advanced metrics: power, cadence, left/right balance and pedalling smoothness for proper performance analysis IPX7 waterproof: rides confidently through British weather and grim winter training blocks BB386 and T47 compatible: works with the major large-diameter bottom brackets, with standard Shimano-style threaded BBs also covered Specifications Type: dual-sided spider-based power meter chainset Crank: PES alloy, triple hollow-channel CNC-machined Spider material: 7075 aircraft-grade aluminium Spindle: 24 mm steel (Shimano Hollowtech II compatible) Chainring BCD: 110 mm, 4-bolt Power accuracy: 1% Battery life: up to 330 hr Wireless protocol: Bluetooth and ANT+ Waterproof rating: IPX7 Bottom bracket compatibility: standard Shimano, BB386, T47 (drive-side BB shell external diameter ?57 mm, total BB shell width with BB installed 90.5-92 mm) Power meter weight: 99 g Total system weight (170 mm crank): approximately 625 g Brand: Magene Chainring sizes: 52/36T (4-bolt 110 BCD)