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Letting the air down to 5 psi for Sledgehammer produced the tire pook we wanted, and the traction coefficient soared. The many sipes on the tread seemed to grip the rocks like glue, and the sidewalls flexed conformably over the boulders. We tried to puncture the sidewalls on some sharpies, but to date it just hasn’t happened. We’ll update you on these tires in a future issue.