![]() Numerous rubber coated steel belts are then constructed into the "crown" of the tire (under the tread) to from a strong two-stage unit which helps in heat dissipation as well as puncture resistance. This makes the tire more flexible which reduces rolling resistance to improve fuel economy. ![]() The bias "footprint" of the tire does flex/distort under load which decreases heat dissipation as well as decreasing the life of the tread.Ī radial tire is constructed with rubber coated reinforcing polyester/steel cable belts that are assembled parallel and run from side to side (bead to bead) at an angle of 90 degrees to the circumferential centerline of the tire (hence the name radial). Bias tires are sometimes referred to as cross-ply as well. Internally, bias tires have the plies (support) of nylon/polyester cords laid at a 30-45 degree angle which typically alternate direction between plies: hence the name bias.
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