New tyres on a 1275 with 5j 13 alloys
Discussion
The original tyres would be 145/80/13, using one of the many on-line tyre calculator gives a circumference of 69.5", changing to 155/80/13 would increase that to 71.5", using 155/70/13 would give 67.6". So you can go up by 2" or down by 1.9" the choice is yours, less then 3% either way.
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