A fixed gear bike has one gear ratio with the rear cog bolted directly to the hub, so the pedals turn any time the rear wheel turns — you cannot coast.
The first ride on a fixed gear humbles almost everyone: you push the bike forward, and the pedals push back at your shins. A single speed looks nearly identical and coasts normally, which is why the two get confused at every bike shop counter. Both carry one gear ratio, one chainring, and one rear sprocket; the difference lives entirely inside the rear wheel.
Fixed Gear vs. Single Speed: What Actually Splits Them?
Single speed counts gears. Fixed gear describes the drivetrain mechanism, and a fixed cog couples the pedals permanently to rear-wheel rotation. A freewheel single speed uses the same one-ratio setup but disengages when you stop pedaling, letting the bike roll freely like any geared bicycle. Every fixed gear bike is single speed in the mechanical sense; plenty of single speeds are not fixed.
On a fixed gear, forward and backward crank movement is always available, and a rider can resist pedal rotation as a supplemental way to shed speed. BikeRadar’s buyer’s guide draws the same line plainly: the label describes the rear-wheel drivetrain, not the number of ratios, so calling every one-ratio bike a fixie is technically wrong.
How a Flip-Flop Hub Changes the Bike
A flip-flop hub turns one rear wheel into two bikes. Many models sold as fixed gear ship with a reversible wheel — fixed cog threaded on one side, freewheel on the other — and swapping the wheel around switches the bike between fixed and coasting operation.
- Brake check: a fixed cog needs a properly secured lockring, and a standard freewheel hub is not automatically suitable for fixed-gear use.
- Component match: confirm the cog, lockring, hub, chain, axle, and chain tension all agree before riding.
- Label skepticism: a bike tagged “fixie” may ship with a freewheel, so inspect the rear wheel instead of trusting the sticker.
How Do the Two Ride Differently?
Pedals keep moving whenever a fixed gear bike moves, so the rider manages crank rotation constantly — over bumps, through corners, and down every hill. That same coupling lets a skilled rider slow the bike by resisting the cranks, though leg resistance is a supplement, never a replacement for a reliable independent brake. A freewheel single speed is friendlier for beginners because you can stop pedaling, level the pedals over obstacles, and coast on descents.
Braking laws vary by state and municipality, and local rules may require one or more working brakes. Pedal resistance should not be treated as the legally required brake. Wear a fitted helmet while learning, and start at low speed in a traffic-free area with secure footwear, since the instinct to coast mid-turn is what causes most early wobbles. Stop riding if the brake, crank, pedal, chain, cog, lockring, axle, wheel, frame, fork, handlebar, or stem is loose or damaged.
| Feature | Fixed Gear | Freewheel Single Speed |
|---|---|---|
| Rear hub connection | Cog bolted rigidly to the hub | Freewheel disengages drivetrain |
| Coasting | Impossible while moving | Normal, like a geared bike |
| Pedal control | Continuous, forward and back | Stops whenever you stop |
| Beginner difficulty | Steep learning curve | Easy to pick up |
| Braking options | Resist cranks plus a real brake | Standard brakes only |
| Hills and descents | Pedals push back all the way down | Coast and rest |
| Typical setup | Flip-flop hub, or track frame | Single chainring and sprocket |
What Does a Fixed Gear Bike Cost in the US?
Current US listings put practical fixed gear bikes in the low hundreds and serious builds well above that. Verify frame size, wheel size, gearing, brakes, tire clearance, and included components on the specific product page before buying, because no universal spec applies to these mechanical bikes. Our tested roundup of fixed gear bikes compares the models that hold up under real riding.
These are not permanent quotations and can change.
Detailed specs — including hub threading and lockring requirements — are worth confirming against reference material such as the Wikipedia fixed-gear bicycle entry before swapping parts.
Common Questions
Can I turn a single speed into a fixed gear bike?
Sometimes, but the rear hub decides it. A dedicated fixed cog needs hub threading that accepts a cog plus a lockring, and standard freewheel hubs are not automatically suitable. Many one-ratio bikes ship with a flip-flop hub that already has both sides, so check the wheel before buying parts.
Is riding a fixed gear without brakes legal?
Rules differ by state and municipality, and many US jurisdictions require one or more functioning brakes. Pedal resistance does not count as the legally required brake. Check your local law and fit a proper front brake, especially while learning or riding in traffic.
Are fixed gear bikes good for beginners?
A freewheel single speed is the easier start because you can coast, level the pedals over obstacles, and rest on descents. A fixed gear demands constant pedal awareness and rewards practice — begin at low speed in a traffic-free area with secure footwear and a fitted helmet.
Sources
- BikeRadar. “Buyer’s Guide to Fixies and Single Speed Bikes” Explains the drivetrain distinction and flip-flop hub setup.
- Wikipedia. “Fixed-gear bicycle” Describes the rigid cog-to-hub coupling and crank resistance.