<br /> Different durometer ratings give each wheel unique characteristics. Green wheels (35A durometer) are the softest and most compliant around objects, maroon (45A), blue (50A), and black (60A) wheels are increasingly firm. The increased firmness also allows the latter wheels to carry a higher RPM rating. Check out the downloads tab for a chart showing wheels and their maximum RPM.</p> <p> </p> <h3>Specifications</h3> <p> </p> <ul> <li><a href="https://www.andymark.com/pages/resources-am-academy-what-is-the-bore" target="_blank">Bore:</a> 0.375 in. Hex, 0.50 in. Hex, 5 mm Hex</li> <li>Core Material: Polycarbonate</li> <li>Diameter: 2.25 in.</li> <li>Durometer: 35A (Green), 40A (Orange), 50A (Blue), 60A (Black)</li> <li>Tread Material: TPU</li> <li>Weight: 0.08 lbs</li> <li>Width: 1 in.</li> </ul> <h3> </h3> <h3>Documents</h3> <p> </p> <p>Layout Print(s)</p> <p><a href="https://andymark-weblinc.netdna-ssl.com/media/W1siZiIsIjIwMjAvMDIvMTAvMTYvMTAvMDUvZDM5OGM4OGMtMmMzNS00YTM2LTliMzYtOWYyNDNkNWU5YmEzL2FtLTM5NDkgMi4yNUlOIDUwMEhleCBIRCBDb21wbGlhbnQgV2hlZWwgUkVWMy5QREYiXV0/am-3949%202.25IN%20500Hex%20HD%20Compliant%20Wheel%20REV3.PDF?sha=580b04593451273d" target="_blank">am-3949 2.25IN 500Hex HD Compliant Wheel REV3.PDF</a></p> <p><a href="https://andymark-weblinc.netdna-ssl.com/media/W1siZiIsIjIwMjAvMDIvMTAvMTUvMTEvMjcvMDIwZDQ5OGMtYjNkZS00YTc1LWFlMzYtNjRlZTkzN2MwMTMzL2FtLTM5NTAgMi4yNUlOIDM3NUhleCBIRCBDb21wbGlhbnQgV2hlZWwgUkVWMy5QREYiXV0/am-3950%202.25IN%20375Hex%20HD%20Compliant%20Wheel%20REV3.PDF?sha=f0bb1a25393f4515" target="_blank">am-3950 2.25IN 375Hex HD Compliant Wheel REV3.PDF</a></p> <p><a href="https://andymark-weblinc.netdna-ssl.com/media/W1siZiIsIjIwMjEvMDQvMjIvMTUvMDQvMjAvMmI3MjJjOTAtNjU5YS00OTQyLWI0NzktODYzNzUwZGJmNTg5L2FtLTQ1MzYgMi4yNWluIEhEIDVtbSBIZXggTW9sZGVkIENvbXBsaWFudCBXaGVlbC5QREYiXV0/am-4536%202.25in%20HD%205mm%20Hex%20Molded%20Compliant%20Wheel.PDF?sha=156f0544f965c142" target="_blank">am-4536 2.25in HD 5mm Hex Molded Compliant Wheel.PDF</a></p> <p>CAD File(s)</p> <p><a href="https://andymark-weblinc.netdna-ssl.com/media/W1siZiIsIjIwMjAvMDIvMTAvMTYvMDgvNTEvMjEwNDI0MjQtM2MxYi00MTJkLTg4ODctZTlmZjUwY2Y1OWE1L2FtLTM5NDkgMi4yNUlOIDUwMEhleCBIRCBDb21wbGlhbnQgV2hlZWwuU1RFUCJdXQ/am-3949%202.25IN%20500Hex%20HD%20Compliant%20Wheel.STEP?sha=4d19561ad1cabcff" target="_blank">am-3949 2.25IN 500Hex HD Compliant Wheel.STEP</a></p> <p><a href="https://andymark-weblinc.netdna-ssl.com/media/W1siZiIsIjIwMjAvMDIvMTAvMTUvMDQvMDcvMGUzOWMwNWEtYTg4Mi00MTEzLThmODEtZTcxMmNhNDNhNDc3L2FtLTM5NTAgMi4yNUlOIDM3NUhleCBIRCBDb21wbGlhbnQgV2hlZWwuU1RFUCJdXQ/am-3950%202.25IN%20375Hex%20HD%20Compliant%20Wheel.STEP?sha=eeb12ad6c1c2eb21" target="_blank">am-3950 2.25IN 375Hex HD Compliant Wheel.STEP</a></p> <p><a href="https://andymark-weblinc.netdna-ssl.com/media/W1siZiIsIjIwMjEvMDQvMjIvMTUvMDMvMDYvYzExZjYyZTUtN2RmNS00NjliLWE2NDctNGU3YjIzOTU0NTVmL2FtLTQ1MzYgMklOIE92ZXJNb2xkZWQgNW1tIEhleCBDb21wbGlhbnQgV2hlZWwuU1RFUCJdXQ/am-4536%202IN%20OverMolded%205mm%20Hex%20Compliant%20Wheel.STEP?sha=d32f8fc4dee09765" target="_blank">am-4536 2IN OverMolded 5mm Hex Compliant Wheel.STEP</a></p>">