This is the Dr. Pulley 19x15.5 Sliding Roller Weights, 169-257 for Aprilia Mojito, Aprilia Scarabeo 4T, Aprilia Sport City One, Aprilia Sr R Factory, Aprilia Sr Street, Piaggio Fly, Piaggio Typhoon, Piaggio Vespa and many more.
Traditionally, gear ratio is changed by the up-and-down rolling movement of the roller weights in the ramp of the Moveable Drive Pulley (MDF).
Benefits:
- Dr Pulley has a US Patent Number 7,276,004
- Their round roller weights eliminate abnormal wear
- Prevent reduction gear ratio deterioration
- Prolong the useful life of the transmission
- The availability to adjust reduction gear ratios as well as driving performance.
- At the same time, Dr. Pulley round Roller Weights are adapted to compensate wear automatically
- Adjust by itself to move further outward in a movable drive pulley half
- Make the vehicle reach a higher maximum vehicle speed.
Product Specifications:
- Size: 19x15.5
- Set of 6
- Broadens your range of gear ratios
- Increases acceleration and re-acceleration properties
- Increases top end speed
- Lasts longer than standard roller weights
- U.S. Patent Number: 7,276,004
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