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GENUINE #100
Verify axle diameter
and milk crates
flush-mount appearance
Dr. Pulley 23x18 Sliding Roller Weights Options:10G GENUINE #100Dr. Pulley 23x18 Sliding Roller Weights for 250cc water cooled 172mm engines. Please select weight from drop down menu. Select Weights on Sale: 10,12, & 28g. The following sizes now come in Black Pearl material: 16g,18g. Please see photo gallery for an example. 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
