Doppler offers here his S3R Variator. It has a wide operating range and especially high stability, essential quality to the optimum transmission of powerfull engine. The Doppler study desk is achieved this by perfect match between the torque spring and the variator. The spring pressure evolution goes perfectly with the work of weights and allows the variator to operate at a fully stabilized regime. Pproperly adjusted the variator delivers optimal transmission efficiency, allowing you to get the best acceleration and speed that can have.