Editing Bicycle (section)

===Wheels and tires===
{{Main|Bicycle wheel|Bicycle tire}}

The wheel axle fits into fork ends in the frame and fork. A pair of wheels may be called a wheelset, especially in the context of ready-built "off the shelf", performance-oriented wheels.

Tires vary enormously depending on their intended purpose. [[Road bicycles]] use tires 18 to 25 millimeters wide, most often completely smooth, or [[slick tire|slick]], and inflated to high pressure to roll fast on smooth surfaces. Off-road tires are usually between {{Convert|38|and|64|mm|abbr=on}} wide, and have treads for gripping in muddy conditions or metal studs for ice.