Quote:
Originally Posted by Mister Towed
SR refers to the speed rating, not the size of the tyre. 165 SR 15's are 80 series aspect ratio: that means that the side wall height is 80% of the width of the tyre 165mm x 0.8 = 132mm. You need to multiply that by 2 and add it to the diameter of the wheel to calculate a total wheel and tyre height. Or you could just paste this link into your browser...
http://www.kouki.co.uk/utilities/vis...ize-calculator
It's quite a useful tool for checking how different sized wheels and tyres compare to the standard Herald/Vitesse 155/80/13's.
175/65/15's are a common size and add only 5% to the diameter of the standard tyres so fitment shouldn't be a problem. The bonus is you get much more modern tyres (so you can actually stop!) at half the price of classics. Try this link -
http://www.tyre-shopper.co.uk/ts/search/SizeSearch.aspx
Good luck finding the right combination and let us know what you end up with.
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SUPERB reply! Just what i was after, i owe you a pint for this!!
So the 2nd figure is simply the side wall height aspect ratio?
So that works out that atm i have 165/80/15's ?
Which gives a total diameter of: 64.50 cm
If i go to 175/65/15's
Then that gives a diameter of: 60.85
So effectively loosing 2cm of radius, which will sort the fouling problem. Nice!
You mention that you're going for: 175/80/14's which is a diameter of: 63.56, which is only 5mm radius from what i've got atm! You "should" get away with that.
This has cheered me up endlessly now! thanks once again
