DUH System - Single Speed Thru-Axle Trail upgrade your bike-supported business’s two-wheeled

upgrade your bike-supported business’s two-wheeled fleet

To offer the best rider experience for every frame size

Customize your Surly or make your shitty non-Surly look like a really bitchin’ Surly

flat-mount brakes

Threaded bottle cage bosses located at the rear of each rail provide mounting locations for accessories: bottle cages

DUH System - Single Speed Thru-Axle Trail upgrade your bike-supported business’s two-wheeledThe Surly DUH system single speed rear axle helps transform your geared bike into a single speeding machine. You will also need a Surly DUH single speed chip and hardware (FS0268 sold separately) to complete the setup. Note: The Surly DUH single speed thru axle only works with the DUH single speed chip and hardware.