Bikini

Cut high into the granite spine of the Black Hills, a short distance east of Keystone, Bikini is a challenging, obstacle-course-like trail that packs a serious punch into a short distance. Shaped like a wet noodle, the trail twists and winds through a mix of sparsely shaded pine forest and open rock faces, offering continuous obstacles with nearly no reprieve. Obstacles are a blend of natural rock gardens and narrow V-notches that create steep climbs, deep ruts, and off-camber squeezes. Some climbs feature sharp breakovers with limited visibility, making a good spotter almost as important as lockers. Despite the tough sections, the granite surface provides exceptional grip.

Navigation can be extremely challenging due to the tight turns, low traffic, and thick grass overgrowth. However, the trail is well marked with 42 numeric carsonite signs helping keep users on the correct path. If you look far out to the west while traveling this trail, you will get a glimpse of Mt Rushmore found nowhere else.

This trail should only be traveled by experienced offroaders in purpose-built rock-crawling vehicles. Big tires, lockers, vehicle armor, and spare parts are recommended. Vehicle damage is likely.