Hi all,

 

might sound like a silly question, but I am treating my Z to a new set of front rubbers tomorrow. The old tyres are 225x40x18 but I know a few people have got 235x40x18's on the front.

What should I go for? Same as old ones 225's or replace them with 235's. Does it actually make any difference to the way the car will drive?

Any help or suggestions would be most welcome.

 

Thanks

 

Glenn

You haven't said what size wheels you have.

I had 235's 18's on the front tramlined like a bugger, switched to 225 all is well! IMHO

Good point Andy, all I know is that they are 18inch alloys:confused: The wheels came with the car when I bought it so I am not sure about all the other dimensions. The tyres on the car now are 225x40x18 fronts and 285x35x18 rears. I will have to try and find out the exact dimensions of the wheels.

 

Thanks

Glenn

Thanks for the tip Big Roy, maybe I should stick with the 225's

 

Glenn

Originally posted by BigRoy

I had 235's 18's on the front tramlined like a bugger, switched to 225 all is well! IMHO

 

IMHO too,had the same thing happen to me!

Macca

 

Aren't you running on 235s now?

 

I'm running 245s all round and don't seem to have that much of a problem, or maybe I've just got used to it.

 

Bigroy, don't you get any understeer now?

On 235's too. No problems no tramlining. On 8.5" rims. I think its already too easy to mark a rim on the kerk and this would be even worse with 225's unless you are on a narrower rim.

 

If its good enough for Maserati its good enough for me. Similar size coupe similar weight. Front engine GT.

 

I accept that the tramlining effect does get worse with wider rubber but 235 is only about 4% more than 225. Its hardly definitive.

 

Maybe the effects are more related to uneven wear and stuff like that on the previous rubber. I think mine might have a tad too much toe in as the tyres are wearing a little more on the outsides than insides.

 

Ive 265/35 on the rear. I think this already puts the gearing out by a couple of percent so Glen if you have 285/35 you will be even further out. There's a calculator that'll show you the gearing effect.

Willie

Originally posted by Cos

Macca

 

Aren't you running on 235s now?

 

I'm running 245s all round and don't seem to have that much of a problem, or maybe I've just got used to it.

 

Bigroy, don't you get any understeer now?

 

No mate 225s on the front,and 275s on the rear.

No I dont get any understeer, get alot of oversteer though! LOL