The Magene PES P515 Power Meter Crank pairs the 99 g 7075 aluminium P515 dual-sided spider with the PES triple hollow-channel alloy crankset, ready for the rider's choice of 110 BCD 4-bolt chainrings. 1% accuracy, 330-hour battery life, ANT+ and Bluetooth, T47 and BB386 compatibility and a 24 mm Hollowtech II-style spindle make it a properly serious dual-sided power meter - and a direct Shimano crankset replacement for riders who already have chainrings sorted. Key Features Spider plus crank only: ideal for riders who want to keep their existing 110 BCD 4-bolt chainrings, including most Shimano 12-speed Dual-sided spider-based measurement: true left/right power data with 1% accuracy and intelligent temperature compensation Triple hollow-channel PES crank: CNC-machined alloy crank arm balances stiffness and weight, tested to 100,000 pedal cycles 110 BCD 4-bolt: broad chainring compatibility, including most Shimano 12-speed road chainrings 330-hour battery life: rechargeable lithium covers a full season between charges 24 mm steel spindle: drop-in replacement for Shimano Hollowtech II cranksets Opposing dual-bolt locking system: reduces non-drive-side crank loosening for long-term reliability ANT+ and Bluetooth: compatible with Magene, Garmin, Wahoo, Bryton, Hammerhead, Zwift, TrainerRoad and more BB386 and T47 compatible: works with the major large-diameter bottom brackets IPX7 waterproof: built for hard British training conditions 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 Chainrings: not included (110 BCD 4-bolt required)