Sponsored by The Tire Rack

[02rsxpilot]

Originally Posted by Stohlen

People complain about understeer because they can't keep from overcoming the grip of the front tires. More of a driver thing than anything imo.

Completely agree. I've actually found on the track with a bone stock 135i (RFTs and all) that whenever I do encounter a little understeer (T2 at Thunderhill), often times just backing off the steering input a little actually allows the front to regain some grip and rotates the car to where I need it. If instead the driver tries to add more steering, it just makes the front scrub even more and the problem even worse.

If you are overworking the front tires, you are sacrificing exit speed for the sake of entry or mid-corner speed. This is not the recipe for optimal lap times.

[Fifty3bags]

285/35R18's on a slight roll

[Stohlen]

Originally Posted by Fifty3bags

285/35R18's on a slight roll

Irrelevant. This would never work with that drop. Leave them for the corvette they came off of.

[Fifty3bags]

Originally Posted by Stohlen

Irrelevant. This would never work with that drop. Leave them for the corvette they came off of.

Yes, they would work on that drop because I drove around with them on at this height. I didn't drive on them for long because they aren't my wheels and it was getting dark out and I needed to drive home.

Just because you don't "think" they'll work doesn't mean they won't.

[Stohlen]

Originally Posted by Fifty3bags

Yes, they would work on that drop because I drove around with them on at this height. I didn't drive on them for long because they aren't my wheels and it was getting dark out and I needed to drive home.

Just because you don't "think" they'll work doesn't mean they won't.

I don't think... I can see that if you hit any bump you'll smash the tires into the fender. Unless you're running a completely rigid suspension they will cause major issues.

Sure if you never hit a single bump they might work, and you may not get rubbing, but that’s not real world. Remember, people are going to buy wheels and tires based on your claims... If you claim they work and then they end up rubbing terribly in the real world, you're gonna inadvertently screw a ton of people over.

[Fifty3bags]

Originally Posted by Stohlen

I don't think... I can see that if you hit any bump you'll smash the tires into the fender. Unless you're running a completely rigid suspension they will cause major issues.

Sure if you never hit a single bump they might work, and you may not get rubbing, but that’s not real world. Remember, people are going to buy wheels and tires based on your claims... If you claim they work and then they end up rubbing terribly in the real world, you're gonna inadvertently screw a ton of people over.

If you take a look you will see that the wheel/tire is inside the fender. I hit bumps to make sure that it would not rub as I will be running a similar setup in the future. I stated that my fenders were rolled. I am not making a claim, I understand the premise of this thread and if they did not work I would not have posted this. Also, that is with the suspension flexed as i was going over a dip to get it out of the garage. I have Megan Racing coilovers, not the stiffest out there but they are stiffer than stock.

[135Pats]

Holy guacamole you fit 285/35R18 in the back? There is NO room to the fender, and very little material to roll. Very impressive you fit that with an aggressive drop.

[Fifty3bags]

Originally Posted by 135Pats

Holy guacamole you fit 285/35R18 in the back? There is NO room to the fender, and very little material to roll. Very impressive you fit that with an aggressive drop.

I was skeptical as well. One, because they are wheels off of a corvette with unknown backspacing/offset. and two, because they're 285s. There wasn't much room there and with an agressive roll of the fender (rolled flat) or shaving the fender would have gained me probably 1/2" of play extra from what I already had. The drop I have isn't terribly aggressive, fender goes down just below the top of the rear 245/35 tire on my stock wheels. Also, from a quick glance under the car there was a good 1.5" or more from the inner side of the tire/wheel to the shock body.

[135Pats]

Yea the issue in the rear is room to the fender, there’s OK space to the strut. Up front it’s another story.

That’s incredible you got that to fit. Perhaps I’ll try 275 in back when I next do tires.

[SfValley335i]

Originally Posted by Fifty3bags

I was skeptical as well. One, because they are wheels off of a corvette with unknown backspacing/offset. and two, because they're 285s. There wasn't much room there and with an agressive roll of the fender (rolled flat) or shaving the fender would have gained me probably 1/2" of play extra from what I already had. The drop I have isn't terribly aggressive, fender goes down just below the top of the rear 245/35 tire on my stock wheels. Also, from a quick glance under the car there was a good 1.5" or more from the inner side of the tire/wheel to the shock body.

How much camber do you have in the rear?

[Fifty3bags]

Originally Posted by 135Pats

Yea the issue in the rear is room to the fender, there’s OK space to the strut. Up front it’s another story.

That’s incredible you got that to fit. Perhaps I’ll try 275 in back when I next do tires.

If I were you I would go out and measure it first, if you aren't confident in your measurement either have a professional measure clearance to make sure you are able to run that size. This fit was just a set of wheels that we wanted to see if they would fit.

Originally Posted by SfValley335i

How much camber do you have in the rear?

The camber was within stock limits (I think it was 1.1*, I have the readout at home and can post them up later.)

[Fifty3bags]

Just got home and these were at -2.2* camber on both driver and passenger side rear wheels

[Dream1]

Any issues with traction control, codes or alike? The final outside diameter is at least 10% larger and should affect traction control besides the common readings for speed and odometer

Just curious about it since I'm planning on doing a less aggressive set up on 265s for the rears

[ChazWald]

Hopefully this will no be so offensive that I get blocked, I have a question which doesn't seem to be covered by the other threads.

[uberschnell]

On wide rear tires, high offsets and extensive drops there is an issue with rubbing on the fuel filler neck.

[Freon]

Offset is critical, and 95% of threads on this forum are discussing offsets that are just too low to maximize tire width and performance, especially in the rear. It's almost all "stance" here, so beware. There are only I think 3 sets of wheels available with the properly high positive rear offset since it is unusually high. Apex ARC-8 and EC-7, and VMR I think now makes something though the model escapes me.

My setup, which I think is very doable for almost anyone:
http://www.1addicts.com/forums/showthread.php?t=862626

285/30/18 can work on the rear 9.5" as well (briefly checking, PSS, ZII, and RE-11 are rated ok on 9.5").

With enough camber and rolling I imagine another half inch of rim and 10mm of tire is possible with precisely the right offsets (should be -5mm offset because there is no more room inboard). Any coilover that reduces inboard clearance is going to cut down on what you can fit. Pretty risky territory, though.