New wheel/tire setup - are these offsets ok? UPDATED 11/1/11
 

****Updated 11/1/11****
This is the setup I'm now curious about:
How about this setup with Tein coilovers?

17*9 +22 rear with 255/40 tire
17*8 +35 front with 235/40 tire

Will that work?
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Hey guys, I'm about to switch to a new wheel/tire setup on my S4 GXL, and I want to get about as much rubber as reasonably possible under the thing. I'm planning on rolling the fenders, and I'm open to running spacers if needed. All I really care about is getting the best handling possible out of this beast (without blowing through tires every six months.)

The setups I want to use is this:

Tires: Falken Azenis
Front: 235/40 r17
Rear: 255/40 r17

Wheels: Enkei RPF1s
Front: 17x8 +45 offset
Rear: 17x8.5 +30 or +40 offset

Apparently those offset are the only ones these wheels are available in. Can I make those offsets work, either with or without spacers? Also, I know those rims are wide enough for the tires to fit on all right; is there any reason I should consider any other size wheel?


Thanks in advance!

-Collin

17x8 +35 front
17x8.5 +30 rear

The offsets you listed will rub in the front.

You can get a 17x8 +35 RPF1. I had a set on my FD.

Thanks, Nader! I could achieve that with some 10mm spacers, right? The guy I was talking to told me they're only available currently in a +45. I would probably do 17x8.5 all around, worst comes to worst

What do you think of those size wheels for the setup?

With coilovers you can run a 17x8 +35 F and a 17x9 +35 R without rolling the fenders unless you're doing some SERIOUS track duty with R-comps. Trust me on this.

The size tire you have listed for the rear, while it will work, isn't ideal for that rim size. 9" is good for a 255 tire.

A 10mm spacer is WAY too much in my opinion. You'll need longer wheel studs, new lugs etc etc etc.

From the specs above, you can play around with different sizes/offsets by using a calculator like this one
http://www.rimsntires.com/specs.jsp

Or you can go baller........ :suspect:

Enkei RPF1 in an 18x8.5 +30 and 18x10 +38 with a 255/35 and a 275/35. Use lots of inflation though and hope they don't flex. You MAY rub in the rear, I did slightly with the Hoosier R6's on the trailing arm and the exhaust shield, BUT, they were about 5lbs under inflated, they never really got hot enough, the fronts did though :rofl:

Stock fenders up front? I guess the extra diameter buys you a lot of space on the inside. I've got 16x8 +32 RPF1's up front with Stance GR+ coilovers and with a puny 225 tire (Toyo T1R) I was rubbing the spring perch (small spacer fixed that problem). To make matters worse I was also catching the inside lip on the fender (more camber + fender roll fixed that one). I suppose the extra inch in wheel radius could buy you ~4 mm on the inside but given my experience I have no idea how to account for the extra ~8 mm on the outside. What was the front camber?

Thanks, Brian! Any idea what I can get away with not using coilovers? Ill probably change over eventually, but im dropping a lot of cash into supercharging and wheels and tires; can't really afford coilovers for now

If you can't afford coilovers, then don't go any lower offset than a +30 with an 8" wheel. Without coilovers, you'll rub on the spring and possibly the fender depending on the width of the wheel.

I would spend the money on coilovers first before you look at wheels.

Only reason im doing things in this order is because I have a buyer for my old wheels lined up already. So would I be able to not rub by doin a 30 in front and 35 in back?

I had to roll the fenders to get those badboys to fit, no tug, no pull though. Depending on the rubbage at the next event, I may toss in a small 2mm spacer in the rear.
Camber was about 3.5*

This

Look for spring rates in the 7/5 range. Alot of them com 8/6 and that's way too stiff. The only time I wanted more spring in the front was going into big bend @~100mph on Hoosier R6's

Sorry to get off track, but I noticed that you mentioned supercharging, what type of set up were you looking to do?

Paxton/Nelson with the large pulley on a 6-port.

I've actually got basically everything I need... I'll be posting a thread in about a month when the car is (with luck) done. I want to do this properly, but that means it's taking far more time and money than expected.

Well good luck with the project, looking forward to you thread.

How about this setup with Tein coilovers?

17*9 +22 rear with 255/40 tire
17*8 +35 front with 235/40 tire

Will that work?

Front perfect, rear will most likely contact the fender, lots of rolling would be a good thing, or running a higher ground clearance

Thanks Brian! Should I look at slightly higher offsets for the rear? I know Logan's going to roll the fenders pretty aggressively, but I think I can prolly get thewheels in a +30 offset or somethin