The KICKR ROLLR is a bike trainer that combines smart resistance training with the realistic feel of rollers. Riders get the engaging workout of a smart trainer (measuring and responding to rider power output, riding in virtual environments, etc.), but the rear wheel is not rigidly clamped to the trainer. Instead, the rider is supported by their compliant tire, which has the smooth side-to-side flow of actual road riding. This unconstrained movement lets riders train longer without discomfort. ROLLR’s second major advantage is the simplicity of mounting the bike. Simply roll the bike in to train and roll it back out for a road ride.