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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 ...
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 ...
As the early motorcycle industry progressed, larger tyre sizes accompanied larger engine displacements, so that by 1909–1914, 2 + 1 ⁄ 4 in (57 mm) section, 26 in (660 mm) diameter tyres were used on 250 to 350 cc (15 to 21 cu in) motorcycles, and 2 + 3 ⁄ 8 to 2 + 1 ⁄ 2 in (60 to 64 mm) section tyres appeared on motorcycles with ...
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 ...
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.
A diagram showing the effect of decreasing the head tube angle, the fork offset, or the wheel size (diameter) on the trail. Animation showing how fork offset must change with changes in steering axis angle to keep trail constant. Animation showing how fork offset must change as trail changes to keep steering axis angle constant.
ETRTO sizes apply to rims and tyres for vehicles of all types, including bicycles. The great advantage of ETRTO sizing is that it is unambiguous; previously, nominal dimensions were used which were interpreted in different ways by different countries and manufacturers - a problem for the end user.
The following outline is provided as an overview of and topical guide to tires: Tire (North American) or tyre (British) – ring-shaped covering that fits around a wheel rim to protect it and enable better vehicle performance by providing a flexible cushion that absorbs shock while keeping the wheel in close contact with the ground.