The Doppler Variator S3R Piaggio is a slightly different, low-friction CVT system by Doppler.
Instead of rollers, this variator is using small centrifugal weights for adjustment. Their movement is rev-dependent, with the added advantage that the weights don’t jam resulting in optimum power transmission. Peugeot developed this system for their 103 mopeds in the 80s.
Top quality, HQ materials, excellent manufacturing, and easy to mount.