Skaters challenged us to make a grippy wheel with lots of roll. We started by creating a brand new core with less material than ever, making it light and flexible. We added our finest urethane tire formula and shaped it shorter than normal. The result is a wheel with lots of roll and plenty of flex in the hub, allowing for a smooth, grippy feel. Note the added flex causes the graphics to wear off quicker than usual. These indoor recreation wheels are perfect for derby use. Specification: 59mm x 42mm with a reinforced urethane micro hub