Replacing 245/40/18 With 235/40/18

[astroinc]

I apologise if this has been answered elsewhere, I cant seem to find anything.

Can you replace the stock 245/40/18's with 235/40/18's. I was looking at the KU31's and its a difference of $75 per corner?

Is there a different size that's more compatable with the stock 245/40/18?

Any advice would be greatly appreciated.

Cheers

[arronm]

what is the load rating of the 235

[ms700]

If you go from 245/40 to 235/40 the rolling diameter will change, so your speedo will be further out, and revs will change on the highway.

And I think not for better......

[tekaani]

235 is the width. still the same diameter

[Never had any say Panda]

Because the width changes the sidewalls will be angled which changes the rolling diameter.. Calculators all over the net for it to tell you how bad.

[astroinc]

The stock load is 93Y and the rating of the KU31 is 95. I am guessing if the replacement tyre load is the same or higher then it should be ok.

I have heard there is a rolling diameter tolerance of 15%, is that correct?

I am really curious if there is anyone who has substituted the 235's.

[sexual harrassment panda]

go for it mate, saving $300 bucks.

is your car tuned?

[astroinc]

It looks like the 235's will add 1% or 101km/h. I just need to see if its legal.

Yeah just a mild 290rwkw tune.

[sexual harrassment panda]

you can get the tyre size changed in the computer in a few minutes, get your tuner to do it for you. Speedo will probably be more accurate if you don't though, they are all out on the + side from factory

[Worm]

235's will make the diameter smaller and hence you will be doing prob 94km/h when your speedo shows 100...