The Kryptonic 70mm Classic K is a good choice for smaller boards, where there might be less wheel clearance or you just want a lighter board. They are radiussed on the outer edge so that when you push the grip to the edge, the slide is smooth and predictable.
As with their bigger brothers (the Kryptonic 76mm Classic K's) the urethane is bonded to a small plastic core that takes an 8mm spacer. This keeps the wheel rolling quickly over even the roughest surfaces.
Shape: 70mm diameter, side set 8mm bearing seat. 45mm wide. 30mm contact patch and 80a duro