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Description: Dr. Pulley 25x15mm Roller Weights for the Aprilia, Piaggio 500cc 4-stroke engines. Traditionally, the gear ratio is changed by the up-and-down rolling movement of the roller weights in the ramp of the Moveable Drive Pulley (MDF). With Dr. Pulley, no abnormal wear will occur even wh..

Description: Dr. Pulley 26x13mm Sliding Roller Weights for Suzuki Burgman 400 (99-Present) street scooters. Traditionally, the gear ratio is changed by the up-and-down rolling movement of the roller weights in the ramp of the Moveable Drive Pulley (MDF). With Dr. Pulley, no abnormal wear w..

Description: Dr. Pulley 25x15mm Sliding Roller Weights for Kymco Xciting 500cc 4-stroke engine. Traditionally, the gear ratio is changed by the up-and-down rolling movement of the roller weights in the ramp of the Moveable Drive Pulley (MDF). With Dr. Pulley, no abnormal wear will occur even wh..

Description: Dr. Pulley 25x22mm Sliding Weights for the Aprilia, Piaggio 500cc 4-stroke engines. Traditionally, the gear ratio is changed by the up-and-down rolling movement of the rolling weights in the ramp of the Moveable Drive Pulley (MDF). Now the innovative Dr. Pulley Sliding We..