Pair of  5 inch rear drop outs attach the rack frame to the thru axle in your rear wheel. The asymmetrical design is specific to allow attachment to Robert Axle thru axles. Includes hook for attaching the lower part of your panniers. These dropouts are for all mountain and fat bikes with:

• 27.5 inch wheels
• 27.5 inch Plus wheels
• 29 inch wheels
• 29 inch Plus wheels
• Fat bike wheels (26 inch) with up to 5 inch wide tires.