Exquisite design and technology make PES P505 Base power meters have professional performance of stiffness and shifting. Smooth-shifting and simple operation bring a comfortable cycling experience for the performance level. Excellent performance and better compatibility make riders feel the unique passion of pedaling. Combined with built-in intelligent temperature compensation algorithms, it can provide you with precise and reliable power data at any time and anywhere. Extensively tested in harsh environments with highly demanded standards, and with each strain gauge undergoing stress release, the PES P505 Base power meter guarantees a ±1.5% power accuracy. Versatile Compatibility PES P505 Base power meter adopts the widely popular 110BCD four-bolt specification in the market, which reduces weight and has more comprehensive compatibility. The set includes both a power meter and crank to eliminate trouble in choosing a compatible crank. PES P505 Base power meters feature a 24mm steel spindle. SHIMANO users can install it directly without replacing the bottom bracket. Specifications Weight: 650g - Crank options: 165mm, 170mm, 172.5mm, 175mm - BCD: 4x 110mm - Spindle: 24 mm - Shimano - Q-Factor: 147mm - Data Functions: Power, Cadence, Left-Right Balance, Pedalling Smoothness - Power Accuracy: ±1.5%Power Range: 0 ~ 2500w - Cadence Range: 20 ~ 200rpm - Calibration: Automatic, Backpedal & Manual Calibration - Wireless Protocol: ANT+, Bluetooth - Water Resistant: IP67Battery Life: 200 Hours