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  • Bar grip


    alt=Military jeep, showing the prominent bar grip tread pattern of its nearest front tyreBar 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. These span the full width of the tread. It is characteristic of this pattern that they do not have any tread pattern or sipes cut into the rubber to clear water. Bar grip tyres were developed in the 1930s and were the standard military pattern throughout World War II, for vehicles from Jeeps to heavy trucks and armoured cars. They fell from favour in the 1970s and largely disappeared by the 1990s, having been replaced by newer patterns with better all-around performance.

  • Mecanum wheel


    FRC Team 2865, Roboteknix A wheelchair using Mecanum wheels URANUS omni-directional mobile robot Container loader with numerous powered mecanum wheels for shifting and rotation of containers. The Mecanum wheel is a design for a wheel which can move a vehicle in any direction. It is sometimes called the Ilon wheel after its inventor, Bengt Erland Ilon, who came up with the idea when he was an engineer with the Swedish company Mecanum AB. The US-Patent was filed on the 13 November 1972. It is a conventional wheel with a series of rollers attached to its circumference. These rollers typically each have an axis of rotation at 45° to the plane of the wheel and at 45° to a line through the centre of the roller parallel to the axis of rotation of the wheel. A typical configuration is the four-wheeled one of the URANUS omni-directional mobile robot (pictured) or a wheel chair with Mecanum wheels (similar to that pictured).

  • Tire rotation


    Tire rotation is the practice of moving the wheels and tires of an automobile from one position to another, to ensure even tire wear. Even tire wear is desirable to extend the useful life of a set of tires. The weight on the front and rear axles differs which causes uneven wear. With the majority of cars having the engine in front, the front tires typically bear more weight than the rear tires. Front-wheel drive vehicles have not only the engine but also the transaxle in front, adding to the weight differential. Moreover, additional stress is placed disproportionately on the front tires by braking and steering. Thus, tire rotation needs to occur more frequently for front-wheel drive vehicles. Turning the vehicle will cause uneven tire wear. The outside, front tire is worn disproportionately.

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