Rear wheel for the RCT system. Low roll resistance, which makes the wheels roll very easily. Complete rear wheel for the RCT system. Low roll resistance, 2-pack Swix Rapid Change Technology (RCT) is a unique system for Swix classic roller skis with CNC-machined slots on the fork and a completely new axle/wheel system with integrated screws that provide optimal directional stability. The RCT system fits Swix Roadline Classic. Rear wheel, ratchet, bearing Medium resistance RCT system Complete 2pk. Made for Roller Skiing Materials Rubber