Dr. Pulley 18x14 Sliding Roller Weights reds and 30mm venturi sizes —

and 30mm venturi sizes — select from the dropdown

and bikes running 139QMB engines

If your bike runs an unaltered 105mm setup

Material: Kevlar-reinforced EPDM

Product may vary slightly from photos

Dr. Pulley 18x14 Sliding Roller Weights reds and 30mm venturi sizes —Dr. Pulley 18x14 Sliding Roller Weights for 125 150cc 4 stroke GY6 engines. Please select weight from drop down menu. Select weight sizes now available in Black Pearl material: 10g, 11g, 13. 5g, 14g. 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). Now the innovative Dr. Pulley Sliding Roller Weights slide up and down the ramp to change the gear ratio. This