Proper Setup to be Flush with Fender

[Nick71692]

I have a 2015 PP GT and recently ordered a set of Eibach Pro Kit Springs. Once that is complete I am looking for a wheel and tire setup that will sit flush with the fenders.

Not a fan of running spacers, so I am curious to get some feedback on what others have done to accomplish this width, offset wise.

Thanks

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[D.Brown]

Depends on what width wheel you want.

 

[Nick71692]

that's part of what I am trying to determine...what width do I need to be to achieve this

 

[db252]

Not just width but offset as well. Pm Paul at Need4Speed or he will probably just see this and give you the best advice.

 

[Todd15Fastback]

For the rear I am running 20x11 +45 and it sits flush with the rear fenders.

20x10 +33 up front and it is just about perfectly flush.

 

[kn7671]

Here are some specs that will land you in the middle of the pack. You can easily move the backspacing out another 1/4" to 1/2" if you want an a more flush to aggressive setup. Below are the conservative, flush, and aggressive setups.

Conservative setup, just slightly tucked like the Roush Quicksilver wheels.
Width | +Offset | Backspacing | Front Facing

9.0 +40 6.57 2.43
9.5 +45 7.02 2.48
10.0 +51 7.51 2.49
10.5 +58 8.03 2.47
11.0 +59 8.32 2.68

Flush right under the at the edge of the fender.
Width | +Offset | Backspacing | Front Facing

9.0 +29 6.14 2.86
9.5 +35 6.63 2.87
10.0 +41 7.11 2.89
10.5 +48 7.64 2.86
11.0 +54 8.13 2.87


Aggressive setup just past the edge of the fender.
Width | +Offset | Backspacing | Front Facing

9.0 +20 5.79 3.21
9.5 +27 6.31 3.19
10.0 +32 6.76 3.24
10.5 +39 7.29 3.21
11.0 +45 7.77 3.23

 

[D.Brown]

If you message [MENTION=11685]Need4SpeedMotors[/MENTION] he will get you squared away with a perfect setup to suit your needs.

 

[Need4SpeedMotors]

hey guys thought id jump in and help. So first thing is we need to know what diameter and width you desire. This can easily be figured out by a style and or how you desire to utilize the application.

From there we can slim options down to your liking and some wheels will have the option to provide custom offsets which we can then use our special in house specs to get you the best fitment.

shot you a pm lets see what I can do to help you out brotha.

 

[Higgs Boson]

Here are some specs that will land you in the middle of the pack. You can easily move the backspacing out another 1/4" to 1/2" if you want an a more flush to aggressive setup. Below are the conservative, flush, and aggressive setups.

Conservative setup, just slightly tucked like the Roush Quicksilver wheels.
Width | +Offset | Backspacing | Front Facing

9.0 +40 6.57 2.43
9.5 +45 7.02 2.48
10.0 +51 7.51 2.49
10.5 +58 8.03 2.47
11.0 +59 8.32 2.68

Flush right under the at the edge of the fender.
Width | +Offset | Backspacing | Front Facing

9.0 +29 6.14 2.86
9.5 +35 6.63 2.87
10.0 +41 7.11 2.89
10.5 +48 7.64 2.86
11.0 +54 8.13 2.87


Aggressive setup just past the edge of the fender.
Width | +Offset | Backspacing | Front Facing

9.0 +20 5.79 3.21
9.5 +27 6.31 3.19
10.0 +32 6.76 3.24
10.5 +39 7.29 3.21
11.0 +45 7.77 3.23

These specs are assuming you are using a tire that is exactly the same width as the wheel or more narrow. Typically, tires stick out from the wheel a decent amount when sized according to the manufacturer recommendations.

Therefore, wheel width does not matter in the calculation. What matters is offset and tire width. The offset is always calculated to the middle of the rim, so by default, it is calculated to the middle of the tire as well. The tire is wider than the wheel.

If you go from 265mm to 305mm, that is 40mm total and 20mm wider on each side of the middle, or offset distance. If your stock wheel is +40 and you go to a 10 or 11 inch wheel and still at +40, your combo will be 20mm pushed out with no change in offset due to the tire.

Going to a 10" +51 also means you should be running a 285 instead of a 265, which means 10mm - 11mm so the combo will sit in 1mm from stock.

An 11" +45 means you are running a 305 so you are sticking out 15mm from stock overall.

So all these guys running 25mm spacers have wheels that are sticking out from the fenders. Whether it shows on an internet pic or not depends on the angle, but as I have measured the tire to the fender on my car, I have about 10mm before it pokes out and that is on Foundry 20x9+40-42 265mm tires.

 

[Need4SpeedMotors]

Not really ironically you can run a wide setup 11ET 45 it wont stock out , just needs proper alignment adjustments.

 

[Higgs Boson]

Not really ironically you can run a wide setup 11ET 45 it wont stock out , just needs proper alignment adjustments.

An 11 with a 305 and +45 only sticks out 15mm, that is probably fine with a little negative camber, I would not consider that aggressive. However, if I want to run -.25 or -.5 (not everyone is on a road course) then 10mm is my maximum. I just think people should know both sides, lots of people end up with wheels that stick out a little more than they thought they would and end up living with it.

 

[Todd15Fastback]

An 11 with a 305 and +45 only sticks out 15mm, that is probably fine with a little negative camber, I would not consider that aggressive. However, if I want to run -.25 or -.5 (not everyone is on a road course) then 10mm is my maximum. I just think people should know both sides, lots of people end up with wheels that stick out a little more than they thought they would and end up living with it.

My 20x11+45 with 305's running -1.5 camber doesn't poke out and is flush.

 

[Need4SpeedMotors]

It all depends on the person, now that being said I can attest that all the setups I have done I have had 2 poke and that was because the member wanted it to poke sir.

 

[Higgs Boson]

My 20x11+45 with 305's running -1.5 camber doesn't poke out and is flush.

That's what I said in my first sentence.....

And I was also mainly referring to the 315 +30 setups. Poke poke poke.

 

[GuardGT]

i run 10.5 et30 and its 2-4mm poke front and 4-6mm rear lowered on sportlines without alignment. use http://www.willtheyfit.com/ to determine how wide you can go. vossen TUCKS x12 et50 on air ride.

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