With several years of development and working closely with professional teams you can expect extreme accuracy from shimano's first fully integrated power meter hollowtech ii 12-speed Dura Ace chainset.A vital tool for serious cyclists, the DURA-ACE FC-R9200-P power meter delivers reliable, waterproof, dual-sided power measurement. With a rechargeable battery and Bluetooth LE and ANT+ connectivity, the FC-R9200-P is a user-friendly training partner.The DURA-ACE FC-R9200-P power meter brings everything a data-driven cyclist could want. Its integrated, waterproof design brings all-weather reliability while delivering accurate information including left/right balance. A rechargeable Li-ion battery is user-friendly and Bluetooth LE and ANT+ connectivity ensure easy setup.