For 2013-down 41mm fork tubes, and 2014-later 49mm fork tubes. Urethane rings approx. 1/4" height each, fits snugly around tube. Stack as many as you need to build front end clearance between your lower tree and lower leg. Easily covered with fork cans. $49.99 pack comes with 30 rings, over 3.5" for each tube. Or buy individual rings for $1.99 each if you know exactly how many you need.