Delta Cycle Bike Hitch 15/20mm Axle (Boost 15x110mm compatible) Transport Pickup Truck Bike hitch for 15mm thru-axles / 20mm axles Remove Boost 15x110mm axle insert to accommodate 20mm axles Easy mounting to any flat surface Rust-free aluminum construction The platform is 3.75 x 1.5" and the holes are 3" center to center. Compatible with following: 15 x 110 mm (Boost, silver insert) ; 15 x 135 mm (Borealis, Fatback, 9zero7 + other Fat Bike forks) ; 15 x 142 mm (Salsa + others) ; 15 x 150 mm (Rock Shox Bluto Fork + others) ; 20 x 110 mm Easily transport your thru-axle bike Works with 15 or 20 mm thru-axle Sturdy aluminum construction