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Old 03-23-2012, 07:38 AM   #1
swift996
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The grip dilemma - tires

Any idea of how wide of a tire you can stick out back without rubbing? I know it probably won't be known until people try. 215s are a joke! I like to stick to the road. While getting the back end out a little is fun, I'd love a 245/255 out back. It seems the car is set up to be neutral/fun to drive for the average-joe. I'm assuming with just 200hp and the solid chassis, it's probably very easy to control when losing grip. I like my cars on rails
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Old 03-23-2012, 07:48 AM   #2
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what makes you think you won't stick to the road on 215s?
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Old 03-23-2012, 07:50 AM   #3
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Id hope 245s could be fit back there for future plans. Im interested in reviews of these 215s at high levels of driving.
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Old 03-23-2012, 07:52 AM   #4
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Really hoping a 17x9 wheel with 245s on will fit without issue. Want to know before I order some Hankook R-S3s!!
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Old 03-23-2012, 07:57 AM   #5
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Somewhat hard to find 17x9 in 5x100. I'm doing 17x8 +35 with 235/40 all around.
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Old 03-23-2012, 08:07 AM   #6
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Quote:
Originally Posted by 7thgear View Post
what makes you think you won't stick to the road on 215s?
Physics..lol, I've ran 275-305 on my last several cars (RX8, 911, M3) and it's a world of difference from previous cars I owned (especially in high speed corners).
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Old 03-23-2012, 08:10 AM   #7
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I could have sworn we had a couple of good threads on this topic in the tire and wheels section? OP, you might look there as well as there was some good info posted.
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Old 03-23-2012, 08:13 AM   #8
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Originally Posted by swift996 View Post
Physics..lol, I've ran 275-305 on my last several cars (RX8, 911, M3) and it's a world of difference from previous cars I owned (especially in high speed corners).
Well then you should know that sticking fatter tires out back and leaving skinnier ones on the front (which your op implies is your planned strategy) is going to shift your car's balance to serious understeer. And going super-fat on all four corners will numb the steering feel this car is being so praised for.
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Old 03-23-2012, 08:29 AM   #9
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245 is not super-fat though, relax.
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Old 03-23-2012, 08:40 AM   #10
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245 is not super-fat though, relax.
215 to 245 is quite enough to make a difference in balance, 9% more contact area.
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Old 03-23-2012, 09:36 AM   #11
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I would say get some V7 STi Goldies (WRB BRZ) 17x7.5 and run 225 Square for Daily Driving. Than rock some 245 Square Hoosier A6's for Stock class AutoX on the stock wheels.

(You may substitute whatever wheel you want)
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Old 03-23-2012, 09:53 AM   #12
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I think the first thing to change would be tire compound/type rather than tire size lol...these are summer touring after all, changing them to summer performance or high performance or something should see a benefit already.
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Old 03-23-2012, 09:55 AM   #13
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I think the first thing to change would be tire compound/type rather than tire size lol...these are summer touring after all, changing them to summer performance or high performance or something should see a benefit already.

I can agree with that. The stock tires sound like fun. Will definitely use them until they die and then decide if I want OEM tires again or go with something different.
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Old 03-23-2012, 10:42 AM   #14
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The contact patch between a narrower tire and a thicker tire on this car should be roughly the same given the weight and PSI are held constant. It's the shape of the contact patch that changes which, using a thicker tire, will help cooling of the compound and that is what increases your effective grip.

That said, while I was at the auto show I did some simple measurements (sticking my arm under the fender) and I don't think you can fit that thick of a tire on this car. The front doesn't have much room at all... I think 235 at the most with some negative camber. The rears maybe 245 since they gain negative camber on compression? Either way, square setup would probably be the best in terms of maintaining a neutral handling feel.
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215 to 245 is quite enough to make a difference in balance, 9% more contact area.
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Old 03-23-2012, 11:05 AM   #15
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Originally Posted by Dave-ROR View Post
Somewhat hard to find 17x9 in 5x100. I'm doing 17x8 +35 with 235/40 all around.
I think this will be a popular tire size/wheel spec. I'll be doing the same.
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Old 03-23-2012, 11:29 AM   #16
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Quote:
Originally Posted by serialk11r View Post
I think the first thing to change would be tire compound/type rather than tire size lol...these are summer touring after all, changing them to summer performance or high performance or something should see a benefit already.
So you see more grip on this car as a benefit?
I thought it's legal speeds adjustability was one of the huge selling points of the car?
Adding more grip is just going to dial that out. On the track sure fine, on the road, not so much.
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Old 03-23-2012, 11:38 AM   #17
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Quote:
Originally Posted by tranzformer View Post
I can agree with that. The stock tires sound like fun. Will definitely use them until they die and then decide if I want OEM tires again or go with something different.
Best case senerio I kill the stockers in a summer cause I cant stop driving the car, then make the stock wheels my winter setup. I still have a set of decent Yokohama ice guards which should fit.
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Old 03-23-2012, 11:56 AM   #18
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With this car I'm thinking 225 up front and 245/255 out back.
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Old 03-23-2012, 12:42 PM   #19
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^Enjoy the understeer and inability to break rear tires loose.
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Old 03-23-2012, 12:43 PM   #20
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I plan to go with 235/40-17 Dunlop Star Specs all around. On stock or stock sized wheels if possible, although I realize 7" of wheel width is a little narrow for that size, I'll at least give it a try.
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Old 03-23-2012, 07:29 PM   #21
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Quote:
Originally Posted by Capt Canuck View Post
So you see more grip on this car as a benefit?
I thought it's legal speeds adjustability was one of the huge selling points of the car?
Adding more grip is just going to dial that out. On the track sure fine, on the road, not so much.
Not particularly, I wouldn't bother changing the tires out if I got the car. It would be best if they came with 16" wheels since tires are cheaper. If I were to buy the car, whatever tires it comes with, I'll use them up, and then buy the next set based on whatever good deal I can find, maybe summer performance to see what the craze is all about.

However a lot of people appear to see higher grip tires as something very important, so I'm suggesting that perhaps they shouldn't be focusing on tire size but rather tire compound.
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Old 03-23-2012, 10:35 PM   #22
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^Enjoy the understeer and inability to break rear tires loose.
I've only been reading this forum for a few hours but sheesh this line of thinking is already getting old. There are plenty of ways to remedy the understeer.
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