Why the jargon exists
Cycling has picked up a lot of specialist words, borrowed from engineering, racing, mountain biking, BMX and everyday repair shops. Most of them describe something simple once you have seen it. This glossary groups the common ones by topic so you can scan for the area you need. Definitions are general: exact parts and names vary between bike types and brands, so check your own bike’s manual when it matters.
Parts of the bike
- Frame: the main structure that everything else attaches to. Common shapes include diamond frames and step-through frames.
- Fork: the part that holds the front wheel and connects to the handlebar through the steerer tube.
- Headset: the set of bearings that lets the fork and handlebar turn smoothly in the frame.
- Stem: the short piece that joins the handlebar to the fork.
- Saddle and seat post: the saddle is the seat; the seat post is the tube it sits on, which slides in the frame so the height can be adjusted.
- Crank and chainring: the cranks are the arms your pedals screw into, and the chainrings are the toothed rings at the front that drive the chain.
- Cassette: the stack of different-sized cogs on the rear wheel. Some bikes use a freewheel, a similar idea in a single screw-on unit.
- Derailleur: the mechanism that moves the chain between cogs or chainrings. Bikes with these are often called derailleur bikes.
- Hub: the centre of a wheel, where the axle and bearings sit. Some hubs contain the gears, which is the idea behind hub gears.
- Rim, spokes and tyre: the rim is the metal or carbon hoop, the spokes connect it to the hub, and the tyre fits on the rim.
- Tube and tubeless: a tube is the inflatable inner part of most tyres. Tubeless tyres seal against the rim and use liquid sealant instead.
- Quick release and thru-axle: two ways of holding a wheel in the frame. Both need to be closed or tightened correctly, which is why they appear in any pre-ride bike check.
Gears and pedalling
- Gear ratio: how far the bike moves for each turn of the pedals. A “low” gear is easier to turn and good for climbing and starting off; a “high” gear is harder to turn and suits flat or downhill riding.
- Cadence: how fast you turn the pedals, usually counted in revolutions per minute. Pedalling cadence is a personal and situational thing, and there is no single correct figure for everyone.
- Shifting: changing gear. Smooth shifting generally means easing off the pedal pressure for a moment as the chain moves.
- Cross-chaining: using the chain at an extreme angle, such as the largest front ring with the largest rear cog. It tends to cause extra wear and noise.
- Single-speed: a bike with one gear. A fixed-gear (or “fixie”) bike has no freewheel, so the pedals turn whenever the wheel does.
- Clipless pedals and cleats: despite the name, these clip your shoe to the pedal. The cleat is the fitting on the shoe sole. They take practice to release from.
- Spinning: pedalling quickly in an easy gear. Grinding or mashing: pedalling slowly in a hard gear.
Handlebars and braking
- Drops, hoods and tops: on a drop-handlebar bike, the drops are the curved lower sections, the hoods are the brake-lever housings, and the tops are the flat parts near the stem.
- Flat bar and riser bar: straight or slightly raised handlebars common on hybrid and mountain bikes.
- Rim brakes and disc brakes: rim brakes squeeze the wheel rim; disc brakes grip a metal disc at the hub. Both work well when kept adjusted.
- Brake lever reach: how far the levers sit from the handlebar, often adjustable for smaller hands.
- Modulation: how finely you can control braking force, as opposed to simply on or off.
- Skid: a locked wheel sliding along the ground. This is generally something riders try to avoid, and a skid stop is a specific technique for stopping a fixed or BMX bike.
Riding position and skills
- Neutral position: standing or sitting with level pedals, relaxed arms and a slight bend in the knees and elbows.
- Attack position: a ready stance, usually standing on level pedals with the weight low and the elbows bent, used on rough ground.
- Line: the path you choose through a corner, trail or obstacle.
- Countersteering: a small, brief push on the bar in the opposite direction that helps start a lean. Most riders do it without noticing; it is explained properly in a dedicated article.
- Track stand: balancing almost still on the bike without putting a foot down.
- Bunny hop: lifting both wheels off the ground together. Bunny hop basics are best practised in small steps on soft, flat ground with protective gear.
- Manual and wheelie: a manual lifts the front wheel without pedalling, using balance and body position; a wheelie lifts it using pedal power. Both carry a real risk of falling backwards.
- Drop: riding off an edge or step to a lower level. A drop-in is entering a steep ramp or bowl from the top edge, with the front wheel rolling over the lip.
Places and surfaces
- Singletrack: a narrow trail wide enough for one bike.
- Berm: a banked, raised outer wall on a corner, common at bike parks.
- Pump track: a looping course of rollers and berms that riders can ride by “pumping” with their body rather than pedalling.
- Skills park: a purpose-built area with features of different sizes for practising bike handling.
- Gravel: loose stone surfaces and, by extension, a style of bike and riding built for them.
- Rail trail and greenway: former railway lines or dedicated routes turned into cycling paths, usually fairly flat.
Group riding and general terms
- Peloton: the main bunch of riders in a road race or fast group.
- Drafting: riding closely behind another rider to use their slipstream. It needs experience and clear communication.
- Paceline: a line of riders taking turns at the front. Many groups use paceline riding on training rides.
- Singling out: moving from two abreast into one line, usually when a car approaches.
- Bonk: sudden exhaustion from running low on fuel, generally avoided by eating and drinking regularly on longer rides.
- ABCDE quick check: a short pre-ride routine that looks at air, brakes, chain, and other basic points before setting off.
- Chamois: the padding sewn into cycling shorts.
- Kit: the clothing and gear you wear for riding.
How to use this list
You do not need to memorise any of this. Pick up words as they come up, and ask a rider or a bike shop when something is unclear. If a term describes a skill with a crash risk, such as a wheelie or a drop, treat the definition as vocabulary only, not instruction. Learn those skills gradually, in a safe, flat, traffic-free place, wearing a helmet and suitable protection.