Glossary

A glossary of bicycle and bicycle parts and their functions.

Patch kit

A selection of tools and materials that allows the repair of bicycle inner tubes.

Planetary gearing

A system which provides two or more gearings in the rear wheel hub, or rarely, into the bottom bracket.

Pre-stressing

A newly built wheel typically needs tensioned, stress-relieved, then re-trued to provide a stable, solid ride.

Presta valve

A type of air fill valve used on high-pressure bicycle tires. It is thinner than Schrader-type valves.

Puncture

A hole or leak in the inner tube, causing loss of air pressure. The result is a flat tire.