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Originally Posted by GJKH
My car came with 165/70/13 OEM. Those are harder to source these days.
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I remember when 145/80 R13 were quite common on European-designed small cars, which were prevalent in my country in the '90s, until 165/70 R13 started to become more common even on models which previously featured 145/80 R13 tire size. Now it's almost impossible to find any 13-inch other than 165/70 or 175/70 in Brazil.
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Between the choice of 175/70/13 and 155/80/13 it would seem that the 155s would be more efficient.
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155/80 has a slightly larger diameter.