<strong>Benefits</strong> <ul> <li>CNC machined Round and smooth Pine Wood Car Derby wheels roll faster than standard wheels.</li> <li>Using wheels from the same mold numbers ensures that the inner bore diameter and other wheel measurements will be similar which will help you attain maximum speed.</li> </ul><br><br> <strong>Usage</strong> ProStock Matched Speed Wheels by Derby Dust can be used without any additional preparation.   However we highly suggest to polish the inner wheel bore prior to racing.  Don't forget to add your favorite Dry Lube before race day! <br><br><b>Important Note</b> The lathing operation removes a small part of the outer tread surface. The bead (serrated edge) is intact. The tread reduction is barely visible to the eye, but is measurable with inspection gauge or a measuring caliper. <br><br>  <strong>AS Always.....  Check YOUR RULES!!!!! We can't stress this enough.</strong>   <br><br>Wheel Diameter: 1.174 ± 0.001 (Raw Wheels: 1.182 to 1.185)<br> Wheel Bore ID: 0.0960 minimum <br>Wheel Weight: About 2.5 grams per wheel (Raw Wheels: 2.7 grams/wheel)