Best fit tyre size for GTT

[zymotic]

Looking for best combo on stock wheels on GTT.

Eg. 235/45ZR17 fronts

255/45ZR17 rears

Just wondering if I will have any issues with

these tyres not fitting. Everything is stock ride

height, suspension etc.

[MANWHORE]

um, why would you wanna put 235 on the front and 255 on the back?

255 is supposed to go on 9" wheels and

235 is supposed to go on 8" wheels

It's not that you can't fit it on (you could probably squeeze on 275 if you really wanted to), but basically, it's just too ridiculously big for the wheel. You'll get the sidewalls crazily floppy, and the tyre might rotate on the rim.

This is what I reckon is a good width:

6.5" (r33/r32 gtst wheels) - 205

7" - 205 or 215

8" - 225 or 235

9" 245 or 255

[leech_]

not sure if you can get 255's on them properly remember they are only 7.5" wide. i reckon 235 all round would be the best bet.

[MANWHORE]

If you want firmer tyre walls when cornering etc, i would not go for 235. If you put on a 235, the tyres will be a bit wide.

If you look at a 225 on an r32 gtr wheel (8"), the tyre walls are perfectly straight up and down. That's how I like to run it.

so for the gtt wheel, i'd probably put a 215.

But say for drags, it's different. Having a wider tyre is better, and you don't have to worry about lateral movement of the tyre, so putting a 235 on would be good.

[zymotic]

Ok so 235/45/17's on all 4.

4.6mm larger sidewalls won't be much of

an issue will it?

This is assuming the compliance place

will let me put on non-standard tyre sizes.

Otherwise itll be the stock 225/45/17 all round.

Thinking about Hankook K104's, had Falken ZE326

last time - hopeless in wet.

[ecl]

i've got:

235/45/17 front

255/45/17 backs

i have stock suspension but my wheels are 8'' front and 9'' back

no scubbing etc

[IanH]

ECL - Do you have any Traction contol problems (TCS) or do you turn it off?

I had 235/40-18 front and 255/35-18 rear and the TCS could see that there was 1inch difference in Circumfrence and activated the TCS over 80mph

I changed the rears to 265/35-18 and solved the problem (1/3rd of an inch difference which the TCS can't see).

info from - http://www.miata.net/garage/tirecalc.html

[3R1K]

I have problem with tcs , it keeps sending the signal to ecu that the car is slipping but it's not. I got the problem since i change 255/45/17 to 245/45/17 for my back tyres, I'm going back to 255 soon. Btw i got 8" front and 9" back

[kudos.motorsports]

I think you might find that the width is not the problem here only the rolling diameter. Think if it logically for a larger diameter (55 profile) to complete one rotation it will have to be rotating fast then a smaller diameter (45 profile). Seeming both are traveling at the same speed (unless traction has really been lost) the small profile wheel will complete a rotation before the larger therefore the ECU calculates this as a lost of traction hence the TRC warning light and related issues.

I hope this helps.

I know that this doesn't stay true for eriktufa's case, I have no idea why your having troubles your 45s shouldn’t confuse the system at all.

Someone please correct me if I'm wrong,

Sully

[ecl]

hmm, no probs with TCS as such

but i mostly turn it off when i start the car

(force of habit)

[Bass Junky]

I have 8 inch rims on the front, 9 on the back.

I run 235 on the front and just recently changed to 255 on the read, previously 235 stretched to fit.

Didn't have problems before and don't have problems now.