This is the Dr. Pulley 23x18 SLIDING Roller Weights, 169-219 for the 250cc water-cooled 172mm engines.

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 Weightsslideup-and-down the ramp to change the gear ratio. This unique sliding movement (not rolling) provides exclusive advantages to increase CVT performance. With Dr. Pulley, no abnormal wear will occur even when running in high gear.

Product Specifications:

• Size: 23x18
• Set of 6
• Available in 10 Gram Through 28 Gram Weight
• Broadens your range of gear ratios
• Increases acceleration and re-acceleration properties
• Increases top end speed
• Lasts longer than standard roller weights