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tyre grip
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. 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 They fell from favour in the 1970s and largely disappeared by the 1990s, having been replaced by newer patterns with better all-around performance.
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