🚴 Cycling Glossary A–Z

This glossary collects cycling terms — from basic to technical — helping riders, mechanics and curious readers understand bikes, components, gear, training and culture. Where relevant, entries link to BikeToday spokes and guides.

A

Aero / Aerodynamics — How airflow affects drag; position, wheels and helmets influence speed. 👉 Read about road & aero considerations
Axle — The shaft that passes through a hub and attaches the wheel to the frame or fork. 👉 Wheel basics
Accessories — Helmets, lights, locks, pumps, computers and bags. 👉 Explore accessories
Air pressure — Optimal tire pressure for comfort, grip and rolling resistance. 👉 Air retention & tubeless

B

Brake — Device that slows or stops the wheel (rim, mechanical disc, hydraulic disc). 👉 Brake systems
Bottom bracket (BB) — Bearing assembly that allows the crankset to rotate. 👉 Components & maintenance
Bell / Helmet light — Safety accessories for urban riding. 👉 Accessories

C

Cassette — Cluster of sprockets on the rear hub that sets gear ratios. 👉 Cassette guide
Chain — Metal links that transfer power from chainrings to the cassette. 👉 Chain maintenance
Chainring / Crankset — The front sprockets and arms converting leg power to drivetrain motion. 👉 Components
Clipless pedals — Pedal systems that attach to cleats on shoes for efficient power transfer. 👉 Pedals
Components — Collective name for drivetrain, brakes, wheels, cockpit. 👉 Read more
Cadence — Pedal revolutions per minute (RPM); used to manage effort. 👉 Training & cadence

D

Derailleur — Mechanism that shifts the chain across sprockets or chainrings. 👉 Components
Dropper post — Seatpost that can be lowered or raised on the fly (MTB). 👉 Seatposts
Dropout & Hanger — Frame slot that holds the wheel axle and the replaceable derailleur hanger. 👉 Dropouts & hangers

E

E-bike — Electric-assist bicycle; different classes and regulations apply. 👉 Types of bicycles
Ergonomics / Bike fit — Adjustment of saddle, stem, handlebar and cleats for comfort and power. 👉 Components & fit
Escapement / freehub — Mechanism that allows the hub to coast while the pedals stay still. 👉 Wheels & hubs

F

Fork — Front assembly that holds the front wheel and connects to the head tube. 👉 Components
Frame — The main structure of the bike; made from steel, aluminium, carbon or titanium. 👉 How a bicycle works
FTP (Functional Threshold Power) — Power a rider can hold for approx. one hour; used to set training zones. 👉 Training

G

Groupset — All drivetrain and brake components sold together (shifters, derailleurs, chain, cassette). 👉 Components
Gravel — Bikes and riding on mixed surfaces; a fast-growing discipline. 👉 Gravel bikes
Gearing ratio — Relationship between chainring and sprocket teeth determining effort and speed. 👉 How shifting works

H

Handlebars — Control interface for steering and body position; many shapes exist. 👉 Handlebars
Hub — Central part of the wheel containing bearings and axle interface. 👉 Wheels & hubs
Hydraulic — Fluid-actuated brake systems offering strong, smooth braking. 👉 Brakes

I

Inner tube — Inflatable tube inside a clincher tire; alternative to tubeless systems. 👉 Tire types
Intervals — Structured high-intensity training blocks to improve power and endurance. 👉 Training
Indoor training — Rollers, trainers and virtual platforms for structured workouts. 👉 Indoor cycling

J

J-bend spoke — Spoke type bent into a J to hook into the hub flange. 👉 Spokes & patterns
Jet / aero helmet — Helmet designed for low drag in time-trial and road racing. 👉 Road & aero

K

KOM / QOM — King/Queen of the Mountain: fastest segment climber (popular on Strava). 👉 Races & events
Kickstand — Simple stand for parking urban and commuter bikes. 👉 Accessories

L

Lens / eyewear — Eye protection from wind, debris and sun; important accessory. 👉 Clothing & footwear
Lights — Front & rear lamps for visibility; crucial for commuters. 👉 Lights guide
Lock — Security device for bikes; choose robust options for urban use. 👉 Accessories

M

Mountain bikes (MTB) — Bikes for off-road, with suspension and wider tires. 👉 MTB guide
Mudguard / fender — Keeps spray off rider, common on commuters and touring bikes. 👉 Accessories
Maintenance — Cleaning, lubrication and checks to keep the bike safe & efficient. 👉 Components & maintenance

N

Nutrition — Fuel and hydration strategies for training & events. 👉 Nutrition
Noise / creak diagnosis — Methods to localize and fix unwanted noises (BB, pedals, seatpost). 👉 Components

O

Open (tubular)** — Tubular tires are glued to rims (used in pro racing). 👉 Tires
Off-road — Any unpaved terrain; determines tire choice & bike type (gravel/MTB). 👉 Gravel & off-road

P

Pedals — Platform or clipless systems for foot engagement. 👉 Pedals
Power meter — Device that measures rider power (watts); key for training. 👉 Training & power
Puncture protection — Tire features/liners to reduce flats. 👉 Tires
Professional fit — A service to tune bike geometry for performance & comfort. 👉 Components & fit

Q

Quick release / thru-axle — Wheel retention systems; thru-axles increase stiffness. 👉 Wheels & axles
Q-factor — Lateral distance between pedal attachments; affects comfort & alignment. 👉 Training & ergonomics

R

Rim — Edge of the wheel that holds the tire (aluminium or carbon). 👉 Wheel construction
Rider position — The combination of saddle height, reach and handlebar setup. 👉 Fit & components
Road bikes — Built for speed on pavement; narrow tires and lightweight frames. 👉 Road bikes
Rims / tubeless-ready — Rims compatible with tubeless systems for fewer punctures. 👉 Wheels

S

Saddle — The seat; fit is crucial for comfort. 👉 Saddles
Shifter — Mechanism used to change gears; can be mechanical or electronic. 👉 Gears & shifting
Suspension — Fork and/or rear shock systems to absorb impacts. 👉 Suspensions
Spokes — Rods that connect hub to rim; lacing patterns affect strength and torque transfer. 👉 Spoke patterns
Stems — Connect handlebars to the steerer tube; affects reach & handling. 👉 Stems

T

Tire — The rubber element that contacts the road; width and tread affect performance. 👉 Tires
Tubeless — Tire system without inner tube using sealant to stop small punctures. 👉 Tubeless & air retention
Training zones — Intensity ranges based on power or heart rate used to structure workouts. 👉 Training
Tours & bikepacking — Long-distance travel by bike; requires specific gear & planning. 👉 Tours & travel

U

Urban / commuter — Bikes and gear optimized for city use and daily transport. 👉 Urban & commuter bikes
USB charging — Modern lights and devices often recharge via USB. 👉 Lights & power

V

Valve (Presta / Schrader) — Types of valves used on inner tubes and tubeless valves. 👉 Tires & valves
VO2 max — Maximum oxygen uptake; important physiological metric for endurance. 👉 Training metrics

W

Watt — Unit of power; power meters measure rider output for training. 👉 Training & power
Wheelset — The pair of front and rear wheels chosen for weight, strength or aero properties. 👉 Wheelsets
Where to buy — Guidance on choosing shops and marketplaces for new & used gear. 👉 Where to buy

X

XCO / XC — Cross-country Olympic mountain bike discipline. 👉 MTB disciplines
XDR / XD / Microspline — Freehub standards affecting cassette compatibility. 👉 Cassette standards

Y

Young rider — Classification for U23/junior athletes in stage races. 👉 Races & events
Yield / recovery — Easy sessions or rest days to allow adaptation after heavy training. 👉 Training & recovery

Z

Zones (training zones) — Power or heart-rate based intensity bands used to plan workouts (Z1–Z5+). 👉 Training zones
Zip (race zip) — Colloquial: to accelerate quickly; also brand names for aero gear (contextual).
Zipper (clothing) — Fastening on jackets & overshoes; practical detail for commuting & touring. 👉 Clothing & footwear