A fixie is a bicycle with a single gear that cannot coast

A fixed-gear bicycle, or fixie, has one chainring in front and one sprocket in back, with no freewheel mechanism between them. This means the pedals and the rear wheel are mechanically locked together—when the wheel turns, the pedals turn, and when you stop pedaling, the wheel stops turning. You cannot coast downhill or coast to a stop the way you can on a regular bike.

The chain runs directly from the front chainring to the rear sprocket with no clutch or ratchet in between. This direct connection is what makes a fixie different from a single-speed bike, which has one gear but does have a freewheel—so you can coast on a single-speed, but not on a fixie.

Fixies became popular in urban cycling and bike messenger culture because they are straightforward, lightweight, and require almost no maintenance compared to multi-gear bikes. They are also used by some cyclists who enjoy the direct feedback and control the fixed gear provides.

Key Takeaways

  • A fixie has one gear with no freewheel, so the pedals always turn when the wheel turns and you cannot coast.
  • The pedals and rear wheel are mechanically locked together, giving you direct control but requiring constant pedaling on downhills.
  • Fixies are simpler and lighter than multi-gear bikes because they have fewer moving parts and no derailleur system.
  • Stopping a fixie requires either backpedaling (if the bike is set up for it) or using hand brakes, since coasting is not possible.
  • Fixed-gear bikes are legal on public roads in most places, but some riders add a hand brake for safety.

How the fixed gear mechanism works

On a regular bike with a freewheel, the rear sprocket can spin freely when you stop pedaling—the wheel keeps turning but the pedals stay still. A fixie removes that freewheel entirely. The sprocket is threaded directly onto the rear hub, so every rotation of the wheel forces the pedals to rotate at the same speed.

This creates a fixed gear ratio—the number of teeth on the front chainring divided by the number of teeth on the rear sprocket determines how far the bike travels with each pedal rotation. A typical fixie might have 48 teeth in front and 16 in back, giving a ratio of 3:1. That means one full pedal rotation moves the bike forward about 10 feet (depending on wheel size). You cannot change this ratio while riding, the way you would shift gears on a multi-speed bike.

Because there is no freewheel, you must always be pedaling or actively braking. Many riders find this creates a more connected feeling between their legs and the road, since there is no dead zone where the pedals are stationary while the wheel keeps spinning.

Stopping and braking on a fixie

Stopping a fixie requires either backpedaling or using hand brakes. Some fixies are set up with a flip-flop hub—a rear hub with a fixed sprocket on one side and a freewheel sprocket on the other, so you can flip the wheel around to switch between fixed and single-speed modes. On a true fixed-gear setup, backpedaling creates resistance that slows the bike, though this takes practice and works best on flat ground.

Most modern fixies have at least one hand brake (usually a front brake, sometimes both) for safety and control. Backpedaling alone is not reliable for stopping quickly, especially downhill or in traffic. Some riders use a fixed-gear cog that allows some backward pedal movement without the wheel reversing, giving a bit more braking power than pure backpedaling.

Riding a fixie downhill requires constant pedaling to keep up with the wheel's speed, or you must brake continuously. This is one reason fixies are more common in flat cities than in hilly terrain.

Gear ratios and how they affect riding

The gear ratio on a fixie determines how hard you have to pedal and how fast you can go. A higher ratio (more teeth on the front chainring, fewer on the back) means each pedal stroke covers more distance, but you have to push harder. A lower ratio means shorter distances per stroke but easier pedaling.

Messengers and urban riders often choose ratios between 2.5:1 and 3.5:1 because they balance speed and control for city riding. Track cyclists use much higher ratios—sometimes 4:1 or more—because they ride on smooth, flat surfaces and want maximum speed. Beginners often start with lower ratios to build leg strength and get comfortable with the fixed-gear feel.

Unlike a multi-speed bike where you can shift to match terrain, a fixie rider must choose one ratio and live with it. This is why fixie riders often talk about their gear ratio the way other cyclists talk about their bike model—it is a core part of how the bike feels and performs.

Why riders choose fixies

Fixies appeal to cyclists for several reasons. They are mechanically straightforward—fewer parts mean less can break, and maintenance is straightforward: keep the chain clean and tight, and the bike will run. They are also light, since there is no derailleur, shifters, or extra sprockets. A fixie frame and components often weigh less than a comparable multi-speed bike.

Some riders enjoy the direct connection between their body and the road. With no coasting, every movement of your legs translates when ready to the bike's motion. This feedback can feel more engaging than riding a bike where you can coast and pedal independently.

In urban cycling and bike messenger work, the simplicity and reliability matter most. A fixie is less likely to have a dropped chain or broken derailleur in heavy traffic, and it is faster to fix if something does go wrong. The fixed gear also gives precise control in tight spaces because the rider can slow the bike by resisting the pedals rather than reaching for brakes.

Fixies versus single-speed bikes

The key difference between a fixie and a single-speed bike is the freewheel. A single-speed has one gear but includes a freewheel mechanism, so you can coast. A fixie has no freewheel—the pedals and wheel are always locked together.

Single-speeds are easier to ride for most people because you can coast downhill and coast to a stop, just like on a multi-gear bike. Fixies require constant pedaling or active braking, which takes adjustment. Single-speeds are also safer for beginners because you have the option to coast if you lose control of the pedals.

Both are simpler and lighter than multi-gear bikes, but a fixie is the most minimal option. If you are new to single-gear riding, a single-speed is usually a better starting point than a fixie.

Safety and legal considerations

Fixies are legal on public roads in most places, but some cities or regions have specific rules about brakes. Many jurisdictions require at least one working brake, and some require two. A fixie with only backpedaling and no hand brake may not meet these requirements. Check your local traffic laws before riding a fixie without hand brakes.

Riding a fixie safely requires practice. You need to be comfortable with constant pedaling, backpedaling for resistance, and using hand brakes smoothly. Downhill riding is more challenging because you cannot coast, and you must pedal fast enough to keep up with the wheel or brake continuously. Many fixie riders add a front brake (and sometimes a rear brake) for safety and control, even if they also use backpedaling.

Fixies are not recommended for riders who are new to cycling or uncomfortable with the feel of a fixed gear. Start with a regular multi-speed or single-speed bike to build basic skills, then try a fixie if you are interested in the experience.

Frequently Asked Questions

Can you coast on a fixie?

No. On a fixie, the pedals and rear wheel are locked together, so the pedals always turn when the wheel turns. You cannot coast downhill or coast to a stop. You must either keep pedaling or use hand brakes to slow down. Some fixies allow backpedaling for braking, but this is not the same as coasting.

Is a fixie harder to ride than a regular bike?

Yes, for most people. You must pedal constantly, even downhill, and you cannot coast to rest your legs. Stopping requires backpedaling or hand brakes. Fixies work best on flat terrain and for riders who have practiced the technique. Beginners usually find single-speed or multi-gear bikes easier.

Do fixies have brakes?

Many fixies have at least one hand brake, usually a front brake. Some riders rely only on backpedaling, but this is slower and less reliable for emergency stops. Most modern fixies include hand brakes for safety, and many places legally require at least one brake on any bike ridden on public roads.

Why are fixies popular with bike messengers?

Fixies are straightforward, lightweight, and reliable. They have fewer parts that can break, and a messenger can fix most problems quickly. The direct pedal control also helps in heavy traffic and tight spaces. Messengers value speed and dependability over comfort, which makes fixies ideal for that work.

Can you change gears on a fixie?

No. A fixie has one gear ratio that cannot be changed while riding. You choose the ratio when you build or buy the bike, and it stays the same. If you want to change the ratio, you have to remove the rear wheel and swap the sprocket, which takes tools and time. This is why fixie riders talk about their gear ratio as a permanent choice.