Allows rider to tune skis loading to current trail conditions. Quickly change coupler block position with a twist of the wrist. Go from uncoupled to your preferred coupled setting instantly. Coupled = less transfer, more weight on skis under acceleration. Uncoupled = more transfer, easier to lift skis under acceleration. Patent pending. - REV Gen4 129” and 137” with rMotion rear suspension (2020 and prior), MXZ Sport, Renegade Sport, Grand Touring Sport (2021 & up)