LeMond Revolution Bike Trainer with Shimano 105 Cassette Larger flywheel adds inertia with a wider range of resistance Simply remove your back wheel and attach your rear dropouts to the spindle Resistance progresses with your speed, creating a smooth pedal stroke with no lag Won't flex and lets you ride out of the saddle Offered with/includes Shimano 105 ten-speed cassette in 12/25. Compatible with all Shimano and SRAM 10 speed systems. Campagnolo adaptor available