285 rear tires on SP wheels?

cossie1600 · 05-16-2010, 08:07 AM

Nismo put the wider tires to justify the bigger wheels and the extra $5000 premium. It gives you better tire compound and better traction off the line, that's pretty much it unless they tune the suspension differently. It's simple physics that your car will understeer more if you put wider tires in the rear than the front. Can you feel it? It all depends on how you drive or if you know how to drive. I have 265F and 285R RE11, the car still plows like a mofo when I race.

Oh yeah, changing to RE11 in the back and stockers in the front, I can tell you the car will definitely understeer a lot.

Auston · 05-16-2010, 09:11 AM

Quote:

Originally Posted by cossie1600

Nismo put the wider tires to justify the bigger wheels and the extra $5000 premium. It gives you better tire compound and better traction off the line, that's pretty much it unless they tune the suspension differently. It's simple physics that your car will understeer more if you put wider tires in the rear than the front. Can you feel it? It all depends on how you drive or if you know how to drive. I have 265F and 285R RE11, the car still plows like a mofo when I race.

Oh yeah, changing to RE11 in the back and stockers in the front, I can tell you the car will definitely understeer a lot.

So you're basically saying that the NISMO does understeer a lot because
they have the 245s up front and 285s in the back. What do you
recommend?

cossie1600 · 05-16-2010, 08:26 PM

Quote:

Originally Posted by Auston

So you're basically saying that the NISMO does understeer a lot because
they have the 245s up front and 285s in the back. What do you
recommend?

I can't speak for the Nismo, but your car will understeer even more than now if you put 285s in the back and keep 245s in the front. I have 265 in front and 285 in the rear, the car still understeers a little bit.

Auston · 05-16-2010, 10:29 PM

Quote:

Originally Posted by cossie1600

I can't speak for the Nismo, but your car will understeer even more than now if you put 285s in the back and keep 245s in the front. I have 265 in front and 285 in the rear, the car still understeers a little bit.

Ok, but what is your motivation for going with wider tires? I'm primarily
interested in straight away speed and I'm looking for an upgrade to
increase traction to the rear tires (i.e. better launch).

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05-16-2010, 08:07 AM	#1 (permalink)
cossie1600 A True Z Fanatic Join Date: Jun 2009 Location: californee way Posts: 5,380 Drives: 370, Leaf Rep Power: 31	Nismo put the wider tires to justify the bigger wheels and the extra $5000 premium. It gives you better tire compound and better traction off the line, that's pretty much it unless they tune the suspension differently. It's simple physics that your car will understeer more if you put wider tires in the rear than the front. Can you feel it? It all depends on how you drive or if you know how to drive. I have 265F and 285R RE11, the car still plows like a mofo when I race. Oh yeah, changing to RE11 in the back and stockers in the front, I can tell you the car will definitely understeer a lot.