Critical Cycles Harper Fixed-Gear / Single-Speed Bike

Sale price Price $189.99 Regular price

Harper single-speed fixed-gear is the next generation of commuter bike. It’s built around a tig-welded steel frame and fork and top shelf componentry and is equipped with front and rear brakes. The hand-built track frame has bar-spin clearance, a flat top tube, no toe overlap, and horizontal dropouts. This is a bike designed for you and your city street adventures.


Harper Single-Speed / Fixed-Gear comes standard with a flip-flop hub. This means you can choose how you ride, whether it’s single-speed with a freewheel or fixed gear. Harper SS comes with the freewheel single-speed side installed. A freewheel allows you to cruise without pedaling, as you would on a traditional bicycle.

You can also ride fixed with an easy switcheroo. All you need to do is remove the rear wheel, flip it around, and then remount it. With a fixed cog, the movements of your bike directly correlate to your pedaling. The faster and harder you ride, the faster and harder you’ll go. The motion of the rear wheel relies on the motion of your feet. But remember, riding fixed is a choice you can make or reject.


A single-speed / fixed-gear bicycle is simple, lightweight, and requires almost no maintenance. There are fewer parts that make up this kind of bike, which means there are fewer parts to potentially damage. Riding fixed is also an efficient workout because you’re always in motion and, therefore, always exercising. When you ride fixed, you are most at one with your bicycle. It doesn’t move unless you move with it. One of the best parts about having a flip-flop hub on a bike is that you can choose which way you want to ride anytime. Riding fixed is a choice you can always say no to.


Riser handlebars encourage a relaxed, upright riding position. This posture is more comfortable and ultimately better for your back.


Harper single-speed / fixie is designed for longevity. The high-tensile strength steel diamond frame is hand-built and tig-welded for the commuter’s lifestyle. Rest assured you’ll be riding on your Critical Cycles frame for a long, long time.


Your safety is very important to us. We’ve equipped Harper SS with dual braking. You’ll have more control over your commute and your stopping with a front and a rear braking system. The rims have machined braking surfaces for safer stopping.


We wouldn’t say we’re control freaks exactly, but we do like to be in control of our rides. That’s why we put so much effort into making every part of our bikes the best it can be. VP freestyle pedals and KMC chain are long-lasting and hard-wearing while the 30mm Deep-V rims and thick, stable Kenda tires make for a softer ride.