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Willys M38 Jeep with bar grip tyres. Bar grip tyres, or 'NDT' (Non-Directional Tire) in US military parlance, are an early tyre tread pattern developed for off-road use.. Bar grips are characterised by a solid rubber circumferential centre strip, with large solid cleat alternately to either side.
Studded mountain bike tires for icy conditions. Off-road tires used in mud or dirt feature individual knob patterns to allow the tire to bite into the surface and lever the sides of the tread to get a better grip. Given the smaller contact patch, these tires tend to wear quickly when used on asphalt (depending on type of rubber).
Billy Boat siping a sprint car tire. Fine slits are cut into the tire with a narrow blade, not near the size of a groove. [8] Racing tires are siped to increase speed. [8] The increased traction allows better contact to the racing surface for increased braking, acceleration, and turning. [8]
Tractor tires have substantial ribs and voids for traction in soft terrain. A tire (British spelling: tyre) is a ring-shaped component that surrounds a wheel's rim to transfer a vehicle's load from the axle through the wheel to the ground and to provide traction on the surface over which the wheel travels.
Softer tires also cushion against rough terrain and road damage, such as washboarding, more effectively. Reducing tire pressure also reduces the extent to which the tires grind against loose surfaces, significantly reducing dust and silt. Another function of CTIS is to maintain tire pressure if there is a slow leak or puncture.
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.
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