astroinc New Member 23 Member For: 20y 8m 25d Posted 24/01/12 05:10 AM Share Posted 24/01/12 05:10 AM 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 More sharing options...
arronm Dropping a turd Gold Donating Members 9,520 Member For: 17y 1m 5d Gender: Male Location: Perth Posted 24/01/12 06:20 AM Share Posted 24/01/12 06:20 AM what is the load rating of the 235 Link to comment Share on other sites More sharing options...
ms700 Moderating Team 10,170 Member For: 21y 10m Gender: Male Location: Sydney Posted 24/01/12 10:01 AM Share Posted 24/01/12 10:01 AM 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 More sharing options...
tekaani Donating Members 163 Member For: 15y 5m 13d Posted 24/01/12 10:28 AM Share Posted 24/01/12 10:28 AM 235 is the width. still the same diameter Link to comment Share on other sites More sharing options...
Never had any say Panda I <3 Floods Silver Donating Members 11,198 Member For: 13y 4m 1d Gender: Male Location: South West QLD Posted 24/01/12 10:43 AM Share Posted 24/01/12 10:43 AM 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 More sharing options...
astroinc New Member 23 Member For: 20y 8m 25d Posted 24/01/12 11:54 AM Author Share Posted 24/01/12 11:54 AM 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 More sharing options...
sexual harrassment panda I see a red door and I want to paint it black Donating Members 5,919 Member For: 15y 1m 6d Gender: Male Location: Far north queensland Posted 24/01/12 12:00 PM Share Posted 24/01/12 12:00 PM go for it mate, saving $300 bucks.is your car tuned? Link to comment Share on other sites More sharing options...
astroinc New Member 23 Member For: 20y 8m 25d Posted 24/01/12 12:09 PM Author Share Posted 24/01/12 12:09 PM 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. Link to comment Share on other sites More sharing options...
sexual harrassment panda I see a red door and I want to paint it black Donating Members 5,919 Member For: 15y 1m 6d Gender: Male Location: Far north queensland Posted 24/01/12 12:23 PM Share Posted 24/01/12 12:23 PM 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 More sharing options...
Worm A much better forum Silver Donating Members 3,808 Member For: 16y 4m 9d Gender: Male Location: Victoria Posted 24/01/12 01:37 PM Share Posted 24/01/12 01:37 PM 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 More sharing options...
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