Ground Control HD2 Aluminum Frames in 60mm & 72mm sizes are an
reinforced version of the original. The HD2 frame walls are thicker and
stiffer - increasing overall strength and allowing for full energy
transfer, equaling more speed at the park and in the street. Countersunk
axle holes help protect steel axle bolts from wear. Interchangeable
plastic & aluminum h-blocks offer options for all kinds of
obstacles. H-blocks are compatible with 60mm HD2, 72mm HD2, and FLT4
frames.
