Adaptrac Test Trail #1 West to East

Adaptrac test trail #1 run west/east. Seen cresting the peak, rider adjusts tire pressure from 50 psi to 25 psi rear, 23 psi front for the is rocky, hard-pack, slick sand dust over sandstone. Descending at this speed requires low tire pressures for maximum traction. Rider: Floppy Bike: Trek Fuel EX 9 with Adaptrac traction system, 26“ Kenda Nevegals.