Combining the real ride feel of KICKR with the natural motion of rollers, KICKR ROLLR smart bike roller trainer makes it easy to transition from outdoor riding to indoor cycling. Stable and able The front safety tire gripper can accommodate tires up to 2.1"" (53mm) to keep your bike upright and secure, making it easy to get on and off the bike while providing stability, even when sprinting. Check bike compatibility for more details. Simple Setup KICKR ROLLR was designed from the ground up to simplify the process of putting your bike on the trainer. No more fussing with thru axles or removing your rear wheel, simply adjust the wheel base, secure your bike and ride. Dual-Roller design Dual-roller design frees up the rear wheel to move naturally, providing an experience that feels more like riding outdoors while reducing tire slip, no matter how much power you put to the pedals. Optimized flywheel technology KICKR ROLLR features a 10.5lb flywheel that when combined with the dual-roller technology provides riders with the precise inertia necessary to replicate the feeling of riding on the road.