[quattro777]

What modern tyre size corresponds to 165/SR/14?

Thanks.

[Tallon]

165/78/14 afaik

[quattro777]

Thanks, do you know which of these would be the best fit or is the difference minor?

185/70/14 or 175/70/14

[Nissan doctor]

Originally Posted by Tallon

165/78/14 afaik

No such size,


A 165R14 in old money translates into a 165/70/14 in a car tyre or a 165/80/14 in a van.

Its not an escort van by chance?

[quattro777]

Originally Posted by Nissan doctor

No such size,


A 165R14 in old money translates into a 165/70/14 in a car tyre or a 165/80/14 in a van.

Its not an escort van by chance?

No, a 1973 Audi 100

[zapata]

The OEM 165SR14 tires have an aspect ratio of 78. (That's 78% of 165 mm.) In those days, aspect ratios where not mentioned with the tire size. Had that been done, the size would have been stated as 165/78-14. This determines the height of the sidewall, which affects the overall diameter of the tire. The OEM tires also came with inner tubes.

Three sizes that can replace the OEM 165/78-14 size (24.13" in diameter), which would still be within spec for the speedometer to record the correct speed and mileage covered. Listed in order from the thinnest width to the widest width, these sizes would be:
185/70-14 (24.20" in diameter)
195/65-14 (23.98" in diameter)
205/60-14 (23.68" in diameter)

[Tallon]

Originally Posted by Nissan doctor

No such size,


A 165R14 in old money translates into a 165/70/14 in a car tyre or a 165/80/14 in a van.

Its not an escort van by chance?

Hmm, you sure?

[Nissan doctor]

Originally Posted by Tallon

Hmm, you sure?

Am I sure there is no such size as 165/78/14? Absolutely.


As for the modern replacement size, the reason for the sizes is that its is almost impossible to get 165/80/14 standard cars tyres these days as extra load(light van) tyres are all thats readily available.

165/75/13 also doesn't exist so the next matching size, keeping the 165 width, is a 165/70/14. You can move to a wider 175 or 185 tyre but the problem with that is older cars, like the audi the OP said he has, have very narrow wheels so fitting wider tyres on them can cause handling issues due to excessive tyre flex.