Isblue

Ok just got some OEM 18s off an 07 is250.... the tires are 225/40/18 fronts and 255/40 rears i think...

The fronts i know need to be 225/45/18 and on the way home my awd warning came on and then the sensor(something else came on) is it ok if i drive like this for like a week?

or do i need to replace the tires asap like tommarow>? thanks

Clay Easto

I believe the OEM's are 17'.

Byprodrive

iTrader: (1)

I would consult your owners manual

Isblue

Thats what my awd came with but his rwd came with the 18s.

Yeah didnt want to do that lol thought someone could answer it

mikez

The default 18" tire setup will not work. I would not even drive with them on to be honest. Which is why I am scared since I am running a larger overall setup, if I ever bust a tire on a road trip I don't think I even can drive home on the smaller spare

lobuxracer

iTrader: (2)

Sounds like you're really pissing off the center differential. It might be very expensive to continue driving on it.

Clay Easto

Exactly why I would not do it. My guess is you are asking for an expensive problem.

love67

iTrader: (6)

if the warning comes on...then better go change it. but its funny that i was using 225/35/19 and 255/35/19, for 2-3 months and nothing happens to me.

Isblue

Um well i replaced the fronts and got 225 45 18 which is the same overall diameter as the 255/40s.... so the dealer said im fine i took it in there and they tried to reset it but couldnt and said it was fine to drive on except that they have to go in and change everything manually.

Yeah i woke up this morning and went and got two new tires.

Nope not asking for one but i hate the oem 17s...

Thats what i did....lol thats funny... i hate this AWD crap but thats the only thing the dealer had and could put me in

mikez

What can I say

Isblue

^^ lol now i talked to my friend at a local shop he said to go and just get 2 more 225/45/18s and then everything will be fine and back to normal with no light on. so i guess thats what im going to have to do...

is anyone sure this will work?

mikez

This is what I went by when I did my staggerd.

http://www.miata.net/garage/tirecalc.html

My rear tires were .5" larger but it still didn't trip the light

Isblue

YEah i checked there first and i thought only diameter had to be the same...

what did you go by?

mikez

What do you mean? I just saw love67 mention that he heard from Lexus tech that its okay within a 1" diameter, so I just did mine according to what is okay for my rim width.

235/40/18
275/35/18

Your warning should of went away after, if not then the dealer should take a closer look to see if there are issues or that the code just got stuck. :/

Isblue

I did 225/45/18 and 255/40/18 and they are the exact same almost... but could it be because i already tripped the sensor and then replaced the tires, thats why i still have the light on?