The Kura; for when accuracy is everythingIntegrated Optical Torque System (OTS) power meter by Ergomo is exclusive to Elite trainers and is certified to be accurate to within less than 1% making it the most accurate power measuring system available to the publicAll Kuras are tested and calibrated before shipping using an Lorenz industrial torque meter, once calibrated an occasional software-based recalibration is all that's required, no sending your trainer back for recalibrationSuper powerful, smooth and quiet fluid resistance unit, the faster you go the harder it gets, just use your gears just as you would when out riding4.5 KG internal flywheel is geared up for high RPM's, generating a far smoother feel than conventional flywheelsComes with a free lifetime subscription to Elite's My Etraining APPConnects to your wireless Android or iOS device by both ANT+ and Bluetooth SmartInternal generator powers the sensors and transmitters, meaning the Kura does not require mains power and can be used anywhereFolds down for easy portage and storageComes with a 9/10/11 speed compatible Shimano freehub, Campag users will require adaptor TT14233Compatible with 130 and 135 Q/R rear ends, as well as 142 x 12 thru-axles