Mavic Rush Mountain Bike Shoe 2012, Black/Silver, 8.5 Mavic Rush Mountain Bike Shoes. With cutting-edge power transfer and mud-slashing grip, the Rush mountain shoes are perfectly equipped for cross-country speed. Energy Grip outsole with Contagrip lugs shed dirt and debris like no other. Ergo Fit 2D insole, heel counter and 2-position ratchet boost energy transfer. Ergo Fit 2D insole, heel counter and 2-position ratchet boost energy transfer. Compatible with removable traction studs for excellent grip and mud clearance on the run-ups.