Arbor Summit skateboard wheels. The Summit is Arbor's technical downhill wheel; an offset design that utilizes Arbor's Groovetube core for a rare balance of grip and drift performance. A leaf-spring sidewall and mid-angle lip work together to create the rebound and power needed to consistently hug the road. 71mm / CP 56mm / OS 2.5mm / 78a. Imported.NOTE: Bearings not included.NOTE: Bearings not included.