As I understand it the original tyres were all 80 section and a 145/80/13 would have 116 mm sidewalls on top of the wheel radius of 165 mm. So the 155/80 tyres specified for the later cars should show a 3% increase in speed (per engine speed) over the 145s and a 155/70 should run 3% slower than a 145/80 and 6% slower than a 155/80. 3% is 1 mph at 33 mph.
26/4088 1965 S1½ Old and scruffy but in perfect working order; the car too.
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Quart Meg Miles
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