fixedgear

Fixed-gear bicycles, commonly referred to as fixed-gear or fixies, are bicycles in which the rear wheel is driven by a fixed gear cog. Because the cog is fixed to the wheel, the pedals move whenever the wheel moves and the rider cannot coast. Most fixed-gear bikes include at least one brake, typically a front brake; some track-oriented or brakeless setups are used on velodromes or by certain riders, though many jurisdictions require functioning brakes for street riding. Braking is achieved by applying hand brakes and, on a fixed gear, by resisting pedal motion to help slow the bike.

The concept originated in track cycling in the early 20th century, where fixed gears ensured maximum power transfer and simple mechanics for racing on velodromes. Street use began to rise in the 1980s and 1990s as riders valued low maintenance, light weight, and a minimalist aesthetic. The term fixie is often applied to street-oriented fixed-gear bicycles, while track bikes remain specialized for racing on banked tracks.

Technical characteristics typically include a single front chainring and a single fixed rear cog, with no derailleur. The drivetrain requires careful chain tensioning, often using horizontal dropouts or a tensioner. Frames are commonly steel or aluminum, with geometry favored for quick handling and a straightforward build. Gear ratios are relatively low compared with geared bikes, and many riders customize ride quality through tire choice, wheel setup, and brake configuration.

Riding fixed gears emphasizes cadence control, precise braking, and awareness of pedal motion, especially in urban traffic. The style has influenced urban cycling culture and design, though it also sparks discussion about safety and appropriate use in different environments.