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Hi, The Tyre size on my Nissan DX reads Dunlop SP 175 M, how can I find out the Aspect ratio and diameter figures associated with this tyre?

Many Thanks Mark

Hello Mark,
Dunlop SP175M is a make and type of tyre - not the size.
Your tyres will also have some other writing on them, saying something like 265/75/R16 (or similar sort of configured number sequence).
For the size I've quoted, this would be a tyre which is 265mm wide, with the tyre wall height being 75% of the width, and the rim size 16 inch. Obviously, yours may be different, but you can work out your tyre size by applying the same principals.

Many Thanks AB, I'm onto it now.
Merry Xmas.