CPC B60C 1/0016 (2013.01) [C08L 9/06 (2013.01); B60C 2200/04 (2013.01); C08L 2205/035 (2013.01)] | 14 Claims |
1. A pneumatic tire having a flattening ratio of 35 to 70%,
wherein, when Y is defined by the following formula:
where A (mm) is a total width of the tire and B (mm) is a breaker width of the tire when a tread of the tire, the tire being rim-assembled on a normal rim and being in a normal state with a normal internal pressure and no load, is pressed against a flat surface with a normal load being applied,
a range of the value of Y changes according to the flattening ratio as follows:
when the flattening ratio is 35% or more and less than 40%, Y is 0.80 or less,
when the flattening ratio is 40% or more and less than 45%, Y is 0.79 or less,
when the flattening is 45% or more and less than 50%, Y is 0.78 or less,
when the flattening ratio is 50% or more and less than 55%, Y is 0.77 or less,
when the flattening ratio is 55% or more and less than 60%, Y is 0.75 or less,
when the flattening ratio is 60% or more and less than 65%, Y is 0.72 or less,
when the flattening ratio is 65% or more and less than 70%, Y is 0.69 or less,
when the flattening ratio is 70%, Y is 0.67 or less, and
wherein an elongation at break of a rubber composition of the tread measured under the following test condition is 180% or more:
(Test condition)
Tensile rate: 14.0 m/sec
Temperature: 100° C.
Test piece: Dumbbell-shaped No. 7.
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