Do We Have Contact?: When a tire rolls, the part that hits the pavement flattens out, becoming the contact patch. As forward motion continues, the contact patch travels away from the pavement and returns to its rounded shape. This constant flexing from round to flat causes plies to rub against each other, generating heat. Unfortunately, not many cruisers are built to use radials, which heat up less and wear better, but improvements in bias-ply technology have produced bias tires which are as good as radials for cruising.