The SRAM Eagle crankset is the lightest, strongest & stiffest crankset they offer & the most technologically advanced that SRAM has ever created. Using a high tier design & construction processes, SRAM has made a lightweight carbon crankset that can tackle any terrain, in any location & at speeds a mountain biker can only imagine. Carbon Tuned Construction The Eagle crankset was born from a completely re-engineered construction using SRAM's Carbon Tuned technology, making it light & exceptionally strong. It has been designed specifically to handle aggressive terrain, rough lines through rock gardens & big drop-ins. To top it off, the advanced, modern carbon construction makes this arguably the most stylish crankset on the market at present. Advanced Quarq Power Meter Quarq power meters use their patented direct-force technology to precisely measure your physical performance throughout your ride. Their meter is located in the crankset, the heart of the bicycle, & because it gathers data from both legs, & it's located at the precise point where muscle energy is converted to forward movement, the power meter spider is the most accurate place to gather power data. 10K Temperature Compensation Eliminates variables caused by heat & cold to provide an unwavering record of your performance through all conditions. Built to last to an IPX7 waterproof rating, & features an easy-to-replace CR2032 battery, a 2-year warranty, free firmware updates & acclaimed worldwide support. Easy to Use Manual & automatic zeroing make Quarq power meters truly set & forget. The chainrings are replaceable should your bike, discipline or ability change. Qalvin BLE with Bluetooth For i OS & Android. With any phone, you can set zero offsets, check the battery, run diagnostics & update the firmware. Free. Other features of the DZero is the Omni Cal technology (which allows changing of the chainrings without affecting accuracy) & Ax Cad (accelerometer cadence – no magnet).