Single-speed bikes — fixed or freewheel — have seen a surge in popularity over the last few years, and it is not hard to see why. They are simpler, lighter, cheaper to maintain, and surprisingly fun to ride. Here is what you need to know before making the switch.
What Is a Single-Speed Bike?
A single-speed bike has one gear ratio, meaning the chainring at the front and the sprocket at the back are fixed in a set relationship. You cannot shift up or down. Freewheel single-speeds allow you to coast; fixed-gear (fixie) bikes mean your legs keep turning whenever the wheels do.
Benefits of Going Single-Speed
- Almost zero drivetrain maintenance. No derailleurs, no cables, no cassette. A single-speed drivetrain can last years with basic chain lubrication.
- Lighter weight. Stripping away the gearing hardware saves several hundred grams — enough to notice on climbs.
- Lower cost. Fewer parts means fewer things to replace. A quality single-speed chain and sprocket together cost under £20.
- Better power transfer. A straight chainline is mechanically more efficient than a cross-chained derailleur setup.
- Builds strength. Riding without the option to drop into an easier gear forces your legs to work harder, improving muscular endurance over time.
Choosing the Right Gear Ratio
Gear ratio is the number you get when you divide the chainring teeth by the sprocket teeth. A 46/16 ratio (2.875) is a popular all-rounder for flat urban riding. If you live somewhere hilly, drop to a 42/16 or 44/16. If speed is the priority on flat roads, try 48/16.
An easy way to test a ratio before committing: shift your current geared bike into an equivalent gear and ride a typical route. If it feels right, that is your number.
Fixed Gear vs Freewheel: Which Should You Choose?
Fixed gear gives you more control — you can modulate speed with your legs, and the direct connection to the wheel sharpens your feel for the road. It does require a learning curve, and braking takes practice. Freewheel single-speeds are more forgiving for everyday riding and commuting.
Most single-speed frames are compatible with both via a flip-flop hub, so you can experiment without buying a second bike.
Is a Single-Speed Right for You?
Single-speeds work brilliantly for flat or gently rolling terrain, urban commuting, and riders who want a low-maintenance daily bike. They are less suited to long hilly routes where having 10+ gears genuinely helps. If your rides involve significant climbing, a geared bike will serve you better. For everything else, a single-speed is hard to beat for simplicity and fun.