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
bigger tyres?
Mar 05, 2004
1 Replies
First reply
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…
Read the full replyOn 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%).
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