GT's Sandbox dirt jump bike tires have an open tread pattern for traction on loose and wet dirt and without tearing up the trail surface for ultimate traction on hard surfaces. It comes in two sizes: 20" x 2.1" with wire bead, 27 tpi. 20" x 2.1" made with Kevlar, skinwall 60 tpi, foldable and lightweight.
Spec information here
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