Actually they work pretty decent in the rocks at <= 10 PSI, due to the large footprint. If it rains they show their weakness, the short knobs don't dig and they don't have the pure adhesion of a trials tire.
The VE33 doesn't have the straight line drive in sand the S12 or similar wide block knob tires do. Feels like its spinning more or letting the rear walk from side to side a bit under power.
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