The Cycleops Magneto Turbo Trainer is the world’s first magnetic trainer with progressive resistance. It gives a smooth ride where the resistance increases exponentially as you increase the pedal speed. In other words the faster you pedal the more resistance it gives. You can then simply shift gears the same as you would outside to simulate climbs, sprints & intervals. The Cyclops Magneto Trainer will work with all common adult bike wheel sizes & with most road & mountain bike frames that use a quick release axle. Thru axle adaptors are available separately. Although the Magneto Trainer is not a ‘smart trainer’ you can hook it up to virtual training software like Zwift using the Cycleops Speed Sensor (sold separately). This will allow you to send data to programs like Zwift but not to get feedback in return. Features The worlds first magnetic trainer with progressive resistance. Magnetic resistance unit provides a quiet & frictionless ride. Precision-balanced zinc alloy flywheel features magneto technology. Promises secure tire to resistance unit fit with our unique clutch knob. Noise level at 20 mph is quiet 66-68 decibels. Eccentric leveling feet allow for easy adjustment on uneven surfaces. Comes on the Cycle Ops foldable Classic frame with spring loaded, bolt-action lever. Precision-machined alloy roller reduces tire wear & slippage. Features clutch knob for perfect roller to tire tension each ride. 2" resistance unit roller allows for 650b, 700c, 26", 27" & 29" wheel sizes– up to a 2.0 tire. This trainer is designed to fit common road & mountain bike frames with included steel quick release skewer & has three settings for rear dropout spacing: 120mm, 130mm & 135mm. Tested to the combined weight (rider & bike) of 300 lbs. Optional thru-axle adapter available