Easton Cinch Power Meter Spindle The Easton Cinch Power Meter Spindle utilizes spindle-based power paired withthe highly adaptable EC90 SL Cranks and accommodates direct mount 1x and 2x rings, providing unmatched versatility. With the CINCH App, you can check battery levels, install updates and calibrate your power meter on the fly. By utilizing Race Face's Cinch technology, it meets a variety of bottom bracket standards and chain-ring formations. With ample configurations, you're offered the adaptability for whatever you want to ride. From cross tracks to major climbs, nothing can stand in the way of Easton's EC90 SL. Specs POWER ACCURACY: +/- 2% DATA TRACKING:Cadence & pedal efficiency data CONNECTIVITY:Dual Bluetooth low energy technology / ANT+ radio for head unit compatibility POWER SOURCE:Battery life over 400h & USB rechargeable COMPATIBILITY:Utilizing EC90 SL CINCH for 1x or 2x configurations SOFTWARE: CINCH Power Meter App for iPhone or Android INTERFAC:Easton & Race Face CINCH crank system compatible | Easton Cinch Power Meter Spindle 30mm Spindle