32 Gtr Tyres And Attessa

[Cosa]

I need new rear tyres for my 32 gtr. Currently have some dunlop dz101 at 265 40 17. Im finding it a little hard to source some tyres in that size, and have been quoted upto a ridiculous 600 a tyre.

If i were to put a 255 40 17 on the rears, with the 265 40 17 on the front would this have an effect on the 4wd system?

Since the rears would be stretched in effect they would have a smaller diameter and cause attessa to kick in?

[Nee-san]

I need new rear tyres for my 32 gtr. Currently have some dunlop dz101 at 265 40 17. Im finding it a little hard to source some tyres in that size, and have been quoted upto a ridiculous 600 a tyre.

If i were to put a 255 40 17 on the rears, with the 265 40 17 on the front would this have an effect on the 4wd system?

Since the rears would be stretched in effect they would have a smaller diameter and cause attessa to kick in?

Hey mate,

Run a search in this section of the forum as this particular problem has been covered a number of times.

As far as I am aware it is the actual rolling diameter of the wheel and tyre that is important for the ATTESSA ETS system.

So having variance between front and rear diameters has been known to cause the ATTESSA ETS to behave in some pretty strage ways, like I said, do a search.

Cheers,

Mitch.

[Cosa]

thanks for that.

Did a search, seems to have answered my question. Attesa will tolerate up to 3% diameter difference.

Based on this caculator http://www.1010tires.com/TireSizeCalculator.asp and factoring in the wear on the fronts i think i might be able to get away with fitting the 255 40 17.

If not i have a 4d controller, so ill turn if off all together

[blind_elk]

Fitting a narrower tyre on a rim will affect the rolling diameter in 2 ways:

1 - narrower tyre has a smaller sidewall height, therefore smaller overall diameter.

2 - stretching a tyre onto a rim will further decrease the rolling diameter.

[Cosa]

i was assuming the above calculator takes that into account, i guess i will find out when i get the 255 fitted

[Nee-san]

i was assuming the above calculator takes that into account, i guess i will find out when i get the 255 fitted

Hey mate,

Do you really think it's worth chancing it ?

Realistically you could be looking at buying another 2 tyres anyway which means your not really saving any money, obviously it's totally up to you but you might just be better off buying 4 tyres of the same type and selling off your other two

[blind_elk]

Or you could move the fronts to the back and put the new tyres on the front.

[Cosa]

i was contemplating doing that elk. I was under the impression that it would still cause problems with the 4wd if the rears are larger than the fronts or vice versa.

And if they do cause big problems, ill chuck it in rwd and use them for mad skids

[blind_elk]

It's only a problem when the rears are SMALLER than the fronts - that combo tricks the ECU into thinking that the rears are slipping.