Color: Black Bolt Circle: 4.00", 4.25" The 31 Series has gone through wholesale changes for 2006. New tooling for both the rim and center will make this the wheel to race. This wheel features CNC spun formed rim shells with extremely low run-outs. It also incorporates a new 7 hole D-window center made from HSLA material with a new torque ring design. All of this put together results in a light weight but durable precision crafted wheel. NOTE: Wheels do NOT have safety bead humps. *4 on4 will work on 4 on 100 mm if you are not using 5/8" studs. This item has a special shipping fee of $7.99ea and all orders will be charged a $10.99 handling fee. For more information see our shipping page.