WAHOO KICKR ROLLR SMART BIKE ROLLER TRAINERStable 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. 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.