Robert PROJECT RESISTANCE TRAINER Rear Thru Axle 12x142mm 172mm BlackRobert Axle Project thru axles allow modern frames to be used with axle mount trainers. For use with bike trainers such as 1up, Blackburn, Cyclops, Kinetic, Tacx and more IMPORTANT: Before ordering, make sure your specific trainer will accommodate the width of the thru axle equipped bike that you are using Measure trainer at the widest setting and measure the bike frame width at the rear hub The Robert Axle ends will extend 15mm past the frame on each