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Off-road tires (Off-road tyre) are a category of vehicle tires that use deep tread to provide more traction on unpaved surfaces such as loose dirt, mud, sand, or gravel. [1] Compared to ice or snow tires, they lack studs but contain deeper and wider grooves meant to help the tread sink into mud or gravel surfaces.
They were used on the first production motorcycle, the 1894–1897 Hildebrand & Wolfmüller, and have been on nearly all production and special motorcycles ever since. [5] [6] During this period tyre sizes were usually 22 to 28 inches (560 to 710 mm) diameter and 1 + 1 ⁄ 2 to 2 in (38 to 51 mm) wide. [6] A: Typical outer casing of a tyre.
Modern road tires have several measurements associated with their size as specified by tire codes like 225/70R14. The first number in the code (e.g., "225") represents the nominal tire width in millimeters. This is followed by the aspect ratio (e.g.,"70"), which is the height of the sidewall expressed as a percentage of the nominal tire width.
The fastest model, with a top speed of 36 mph (58 km/h). Lighting system. Several deluxe variants with white-wall tires and red seats and grips were also made. 671: Similar to 670, except with lower gear ratio and slower speed and possibly, after 1968, a rear grab bar. 675: Same frame and engine as 670, however, gearing was lower. Was released ...
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. [24] 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.
[4] 1979 and 1980 versions had a 23-inch front wheel (3.00 x 23 tire size). Unlike the CRF230F, which effectively replaced the XR200R in Honda's lineup as an air-cooled off-road motorcycle, the XR250R has no air cooled successor until the CRF250F in 2019.