Tyre profile question

[XPfalcon170]

Hey. Just a query as to what tyre profile and width people are running for 18" rims on the e-series. I've got a set of 18' rims less tyres and am not sure whats the best profile to go with as to cause minimal upset to the speedo reading.

[EF Futura 07]

235/40/18

these are only 3mm(643mm) in overall diameter smaller that 205/65/15 wich are 646mm. you can have up to -2/+2% difference without affecting speedo.

go to www.kumho.com.au/tips_diameter :

EDIT.

What car is this for?

[XPfalcon170]

ok, thanks mate. Its for my el. 18s be a bit to big for the xp i would think.

[EF Futura 07]

lol yer i just wasnt sure, i just saw your name and pic ! :

have fun :

[ratter]

Your tyre profile should be based on how wide a tyre you are going to use, you need to keep the rolling diameter as close to standard as possible

[EF Futura 07]

Originally Posted by ratter

Your tyre profile should be based on how wide a tyre you are going to use, you need to keep the rolling diameter as close to standard as possible

yes thats correct, but the question was, what size/width were we running! and what would cause minimal upset to the speedo, you could not get any closer to 646mm with 18's if you tried. i also gave a website with info on sizes!

[XPfalcon170]

yeh, going from that calculator, the 235/40 would be the best match to go with. thanks for that guys. time to hunt down some tires.