Stargazer, 225/40/18 is the right size. Thats what most people with 18" wheels are running on including myself. Check your calcs again, the diameter should not have increased by 16mm.
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Stargazer, 225/40/18 is the right size. Thats what most people with 18" wheels are running on including myself. Check your calcs again, the diameter should not have increased by 16mm.
Sorry, I'm a bit of a noob with tyres. I used the calc on http://www.carbibles.com/tyre_bible_pg2.htmlQuote:
Originally Posted by racerwannabe
It calculates the circumference of my 205/55/16 to be 1985.17mm and the circumference of the 225/40/18 to be 2001.82mm, a diff of 16.65mm.
The 245/35/18 only gave a 10mm difference (decrease) in circumference. I did notice this tyre size seems to be less popular - some manufacturers don't seem to even make this size. But I do like the thought of having wider tyres too. My mind is boggling at all these numbers and choices! Will the 245/35/18 fit a 18x7.5 wheel?
You would be pushing it, you really need an 8 inch wheel for a 245. Max on a 7.5 inch would be a 225.Quote:
Originally Posted by Stargazer
Try this calculator I found it useful when I was looking for wheels.
http://wheelsmaster.com/rt_specs.jsp
Quote:
Originally Posted by Sludge
Thanks. Gave it a go. I should be looking at diameter difference and not circumference? I think that may have been my mistake.
But that above site shows the tire diameter to be 20mm less (and circumference to be 62mm less??).
(Just tried yet another calc at miata.net and it's only 6mm diff... Am I being RTA paranoid about the whole thing?)
you should use the rolling diameter calc on www.1010tires.com.
you can compare with stock rolling diameter.
http://www.1010tires.com/tiresizecalculator.asp
best to stay within aprox 1.5% imo, but ppl do crazy things.
depends how wide your tyres, if you were on a 7.5" i would preferably go with a 225 or max 235,Quote:
Originally Posted by racerwannabe
8 inch max i'd go is around 245 no more.
Sorry, didn't make it clear. I was going for 18x7.5 wheels (but will 18x8.0 fit a 2004 accord euro?)
yeah. right offset though. :)Quote:
Originally Posted by Stargazer
Quote:
Originally Posted by racerwannabe
yeh choose the right offset.Quote:
Originally Posted by Stargazer
Between +40(lower) to +55(higher) will work. (Not the only offsets available though, but the range the euro would be suitable for)
+40 more likely to touch wheel arches at a higher ride height.
+55 sits inside wheel arch so has more room for lowering.
+40 will give you a flush look, and by having it further out will mean you will have more negative camber than someone who has a higher offset wheel.
Ingalls or any camberkit is a must when lowering.
hope this helps you even though it's all been covered....
Thanks for all the help guys. Think I will go with the 18x7.5 with 225/40/18 combo.
Another suitable one would be 18x8 with 235/40/18Quote:
Originally Posted by Stargazer
Quote:
Originally Posted by Crapdaz
Ugh, you've just given the king of indecision another choice to make!
Ok, thanks for all the advice guys. Found a nail in my rear tyre, so took that as a sign from above and went to get the new wheels and tyres today.
Ended up getting the 18x7.5 Lenso GF7 black with chrome lip, and a set of kumho KU23 tyres.
One thing I forgot to ask the tyre place is what is the correct pressure for these tyres (225/40/18R).