Dr.Pulley sliding rolls in the 21x17mm format, weight 8 grams, 6 pieces / package.
Dr.Pulley rolls produce a much better acceleration performance than regular roller weights. They are precisely manufactured from a special nylon material that is characterized by particularly good sliding on aluminum (the material of the Vario). The abrasion is minimal and the dreaded one-sided flattening of standard roles are not possible. Unlike normal vario rolls Dr.Pulley rollers have an up to 15x longer life.
Dr.Pulley recommends that you choose the weight of the SR role sliding around 10-15% below the weight of the series roll. Then a significant powerful acceleration results in an almost unchanged top speed and fuel consumption. If the weight is chosen equal to the original weight, the acceleration is slightly stronger, but may slightly increase the maximum speed for the same or even slightly reduced consumption.
Fits for this scooters:
see Dr.Pulley Forum
Aprilia : Atlantic 200 250 - SCARABEO
Derbi : Boulevard 200
Gilera : Runner VXR 2000, Nexus 300 ie
MALAGUTI : Madison 200 250 (piaggio) Phantom F12 200
PIAGGIO : BEVERLY 200 250 LIBERTY 200 X8 200, X9 200, X9 250 Evolution, MP3 250 300
VESPA: GT GTS 250 300
I chose an 8 gram weight because I wanted to see max speed at 9,000rpm as I do most of my riding at full throttle on countryside winding lanes, & have concerns about the slider weights trying to push the belt too far, possibly rubbing on the Piaggio Quasar's gearbox casting which a too heavy slider weight would do.
I've experimented with 14g, 12g, 10g slider weights, also combined with 14g round rollers.
I like the throttle response with the 8g's although if in slow traffic then the engine can sound & feel too highly strung & nervous, working too hard. Riding through a 40kph zone has the engine doing 3-4,000rpm ! lol
TechPulley sliding pieces SP01 / SP2017-N / SP1917-N