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The main role in tuning a variomatic scooter is weight. Rule of thumb: the lighter your set of rollers, the more revs are needed to push outward rolls through centrifugal motion to set shifting on the go. Heavier rollers need to lower rpm to start this process. This means that if your scooter is lighter than rolls it will need higher revs to start moving. Heavier rollers allow you to start moving at lower rpm. Each driver will have to find out what level of revs is right for them. A number of factors go into this decision: the degree of tuning, the drivers weight, what weight (of rolls) are optimal, etc. RMS weights Variator:: exact tuning due to small weight steps, good quality, prices best. Available for all common engine types and sport variators. Here are the most common formats: Engin.