more like a performance loss... when the tire becomes that wide, you'll get sidewall flex when you turn.. the car will feel sloppy and the steering gets heavy.. braking and accelerating will also feel a little slow as well.

The tire wear will depend on your alignment.. I am not familar of at what point where "too wide" get to be "really bad" because I dont know the suspension very well..

I have seen a few show cars that do something like 315s on 11"s, but that's not anything special since you are probably going to drive your car on the street.

 

you can do it, but no one is going to be dumb enough to drive on it.

 

How wide would it have to be to start seeing performance loss on the 8.5" width? 275? Would 265 be ok without performance loss?

 

dumb enough to drive it? Um they track it all the time! Handles and performs GREAT! Watch the video. Smart guy.

 

275/40s on my stock 8.5 rears. I run 275/35 Hoosiers all the way around on a second set of stock track wheels for Solo II.

I could -- maybe -- get 285/30 V710s on the stock track rear wheels.

 

8.5" is great with a 245 and 255.. so going to a 265 would be a limit.. 275 and 285 gets really sloppy from what I know.

Nominal 8.5" width rim is really measures 9.5" or so.. converting that to mm is 9.5 x 25.4 = 241.3.. so really a 245 tire is great with a 8.5" rim..

 

285 on a 8.5 is a bit much for the rim to handle. Even tire manufacturers dont really list 285s to mate up with a 8.5" wide rim.. 9" is more doable..

275 on a 8.5 is doable.. 285 is really pushing it.. just like how I crammed my 18x8 with a 255 on it.. I dont think I would want anymore than that on my GT. Fitting a 265 on an 8" wide rim is going to feel slow in the steering.

Btw, who's tracking 285s on a 8"??? Most people run 10" minimum with 285s..


If you want to hear some crazy fitments, one of the Solo2 national drivers with his STi fitted 275s on the stock 7.5" wide rims.. it's just too much making the sidewall actually trap in instead of being vertical.

I can understand the fitment for Solo2 racing, but for daily driving? why cram a 285 on a 8" wide rim? Are you trying to sport an SUV look or something?

 

Not anywhere did I mention someone running 285's on an 8inch rim. They are how ever running them on 8.5inch rims just fine 285/30 on an 8.5 and 315/30 on a 9.5. They TRACK these tires at Willow Springs all the time. If you had taken the time to read the posts and follow the links you would understand.

If you don't believe they have the videos of their cars on their web site, which is on the posts above, or better yet why dont you take your Subaru to Willow and run against them and see for yourself?

And as for running 285s on a 10inch rim minimum, that is just not the case. I had ran 285's on a 9 inch rim for almost 2 year trouble free, handled like a dream. All depends on the profile you run.

 

OK not to umm stir up any debates or look like a pesterring fool but..

What would be the optimum width and height for my 19 x 8.5 rears.. I drag my car at the strip and I'd like optimal grip without sacrificing daily driving and steering.. I also like the way a fatter tire looks in the rear.. looks much more aggressive... so if you guys were to pick.. which width and height would you suggest?

I really appreciate all the input guys. REALLY!

Thanks!

 

I would run 275/35-19 but if you have VDC you are going to run into problems if you run those other tires up front.

 

you can get away with a 285 on a 9, but it's still pushing it.. yea, it can be trouble free, but try running a wider rim on that tire and you'll feel the difference..

no one here said that it wouldnt work, I am just pointing out that there are also better alternatives than running a narrower rim on a wider tire, namely a well matched width rim and tire. Not sure if anyone here even reads up any of the Tire Rack information about better fitment:
http://www.tirerack.com/tires/tirete....jsp?techid=64
"Wheels - Always use the widest wheel allowed on your car's class, that fits your car and/or is recommended by the tire manufacturer for your tire size."

Just because someone runs them on the track all the time doesnt mean it's the best setup. If I wasnt so far from Streets of Willow, I would run my Subaru there, believe me, I would.

My question is, why do you want such as sloppy sidewall? You do know you are running a sloppy sidewall right? Yes, I do understand it's a profile issue, but do you know how much a difference it becomes in terms of overall tire diameter when running a 285/30/18 vs a 285/35/18 or even a 285/40/18... I guess none of you guys like using the plus sizing method huh? Might as well if you guys plan on running that much tq and hp to the wheels and add more drivetrain loss by going with an oversized wheel, what's a few hp loss when you guys are already making 400+ hp right?

 

Get a wider rim so you can cram a 315s in the rear. I like the 18" look (so it doesnt make your brakes/rotors too small).. 18x9.5 front and 18x11 in the rear is my opinion.. just get the right offset so that you dont have to roll fenders or anything like that.

 

I'll have to take some pix for you. I have a Brickyard.

 

That isn't an option. I just bought rims. 8 front 8.5 rear. What tire option would youwith with for this setup.. for drag racing with daily driving in mind. thanks.

 

Thanks, I'd appreciate it alot!

 

Nope. No VDC. Thanks.

 

I'm still waiting for someone to post pics of a 285/30 mounted on a 8.5" rim and even more so a 315/30 on a 9.5' rim.

I guarantee if it can even hold air or not collapase under the vehicles own weight, that it will look like something glazed from krispy Kreme.

the contact patch would be like 3" on a 315 LOL

You can have a much bigger contact patch running a 225 on a 9.5" which is wrong too.

 

Nope that would be perfect... i am using a 285/40/18 8.5

 

8 wide you can do 255
8.5 wide for the rear, you might as well get 275s if you are going to drag.. get a softer sidewall tire so that it can wrinkle a little on the launches for you.. if you can opt to get a taller sidewall somehow, get it.