Jump to content

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


astroinc

Recommended Posts

  • New Member
  • Member For: 20y 22d

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

Link to comment
Share on other sites

  • Replies 20
  • Created
  • Last Reply

Top Posters In This Topic

  • Moderating Team
  • Member For: 21y 1m 26d
  • Gender: Male
  • Location: Sydney

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......

Link to comment
Share on other sites

  • I <3 Floods
  • Silver Donating Members
  • Member For: 12y 7m 27d
  • Gender: Male
  • Location: South West QLD

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.

Link to comment
Share on other sites

  • New Member
  • Member For: 20y 22d

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.

Link to comment
Share on other sites

  • I see a red door and I want to paint it black
  • Donating Members
  • Member For: 14y 5m 3d
  • Gender: Male
  • Location: Far north queensland

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

Link to comment
Share on other sites

  • A much better forum
  • Silver Donating Members
  • Member For: 15y 8m 5d
  • Gender: Male
  • Location: Victoria

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

Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
  • Recently Browsing   0 members

    • No registered users viewing this page.



×
  • Create New...
'