The Elite Kura is a B+ Smart, Direct Drive Trainer which gives you some of the most accurate & precise readings, which in turn makes for profiled training sessions. The trainer features the Integrated Optical Torque System (OTS), exclusive to Elite trainers & is certified to be accurate to within less than 1% making it the most accurate power measuring system available to the public. The Super powerful, smooth & quiet fluid resistance unit has an infinite power curve, which means, the faster you go the harder it gets. Use your full range of gears to simulate climbing, sprinting & interval training. Every Kura is tested & calibrated before shipping using a Lorenz Industrial Torque Meter. You will need to recalibrate the trainer after a fair while which is a simple software based calibration, so you won't need to send your trainer anywhere.