my rr has 255/55/18 tyres ,is it poss,for to fit 285/55( or65)/18 instead? It looks like there is plenty of room. Any ideas? thanks
- posted
20 years ago
bigger tyres?
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- posted
20 years ago
On or around 05 Mar 2004 08:05:22 GMT, snipped-for-privacy@aol.comnojunk (Cdunn53) enlightened us thusly:
why, in particular? 255 are plenty wide enough for normal purposes. I've got 10.5" wide on my 110, (about 265mm) which, sometimes, are too wide.
The normal rule is "up 2 sizes, down 10% profile". But it's easy enough to work out:
nominal tyre height is 255*0.55*2/25.4 inches (11", if you work it out) so nominal diameter is 18+11 = 29"
working it backwards, you'll want 285/50 if such are available, to keep the diameter the same.
if you fit 285/55 then you've upped the nominal diameter to 30.3", which will upset yer speedo and milometer slightly (about 4.5%).