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TeutonicShift89: think that grip is made not just by area, but also from pressure per area. In some cases insufficient pressure might put too wide tire in mode that's way less grippy then it's possible to get with narrower. For example - aquaplaning, where wider tire on same speed need way more pressure to push water through groves for longer distance and in bigger volumes. On snow/ice in some cases it's advantageous have less pressure/wider patch, in some - narrower to push stronger in it to stick to ground/ice beneath snow, or push deeper tire studs in it. Puddle of mud. One thing to float in porridge spinning tyres, another - have wheels touching harder ground beneath. Have not enough experience with different width tires on same car and driving on gravel roads to say what is preferred on gravel.
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