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Off-road cycle tires, colloquially called knobbies, [4] may be found on motocross and enduro motorcycles, ATVs, and mountain bikes. [1] Tires for single-track vehicles and ATVs have a curved profile such that some tread only contacts the ground during turning. Depending on the model of tire, an off-road capable tire may or may not be approved ...
ISO 5775 is an international standard for labeling the size of bicycle tires and rims. The system used was originally developed by the European Tyre and Rim Technical Organisation (ETRTO). It is designed to make tire sizing consistent and clear. It replaces overlapping informal systems that ambiguously distinguished between sizes.
Prior to 1964, tires were all made to a 90% aspect ratio. Tire size was specified as the tire width in inches and the diameter in inches – for example, 6.50-15. [29] From 1965 to the early 1970s, tires were made to an 80% aspect ratio. Tire size was again specified by width in inches and diameter in inches.
Increasing the aspect ratio will increase the height of the tire and hence the circumference. Off-roading tires may use a different measurement scheme: Tread width × Outside diameter, followed by wheel size (all in inches) – for example 31×10.50R15 (787 mm × 267 mm R380 in metric designation). The size of the wheel, however, is denoted as ...
There are tires designed for dirt bikes, touring, sport and cruiser bikes. Dirt bike tires have knobbly, deep treads for maximum grip on loose dirt, mud, or gravel; such tires tend to be less stable and noisier on paved surfaces. Sport or performance tires are designed to provide maximum grip for street use on paved surfaces but tend to wear ...
A rear motorcycle tyre for street use. A motorcycle tyre (spelt tire in American English) is the outer part of motorcycle wheel, attached to the rim, providing traction, resisting wear, absorbing surface irregularities, and allowing the motorcycle to turn via countersteering.