10 in all around

[Dave TBG]

More clearance on the fender side. Maybe not as much problem with debris thrown up at your paint by the tires. At autocross, a narrower track width means you can get the CG of the car closer to the cones (slightly faster times in a game where thousandths of a second can and sometimes do matter).


Norm

Thanks, Norm. OK, there are valid reasons, and I knew that, but I was wondering what the OP's reason is. I don't think fender clearance would be an issue with the setup in question, many on the forum run 285/35-19 on 19x10 et35. On the contrary, in my own search, while looking at 19x10 in both et35 and et40, I was advised that et35 is a safe bet but et40 may require spacers. A little negative camber might make a big difference, or variation from one tire manufacturer to the next.
BTW, I did once come in second in class by 0.008 sec. Should I have traded my 944 for a 924S? ;)

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[shogun32]

I was advised that et35 is a safe bet but et40 may require spacers.

correct. Rim lip to strut is about 4-5mm using et40. Tire overhang or particularly chunky lip section can lead to less and thus contact.

 

[WildHorse]

255 on the 10" wheel,I've been told it will fit

It'll fit, but..

 

[Hostil]

I have a 2015 GT , Im running 275/35/20X10 front and 305/30/20X10 rear on stock suspension with no issues, moving to Steeda progressive real soon.

 

[Dave TBG]

I'm just test fitting a 19*10 et35 now. It's about 10 mm tops, maybe less. I don't think I'd want to get closer.
Edit; I should add that camber plates are on my to-do list, the 350R springs and Steeda control arms with extended ball joints added up to less camber than stock.

 

[Norm Peterson]

10mm at the wheel is a ton of room (wheels don't bend anywhere near that much, and a wheel bearing that would permit that much movement would be causing even worse issues).

Though you are getting a bit more room for tires out toward the maximum recommended size for 10" wide wheels (their sidewalls tend to bulge out past the wheel flanges)..


Norm

 

[Dave TBG]

10mm at the wheel is a ton of room (wheels don't bend anywhere near that much, and a wheel bearing that would permit that much movement would be causing even worse issues).

Though you are getting a bit more room for tires out toward the maximum recommended size for 10" wide wheels (their sidewalls tend to bulge out past the wheel flanges)..


Norm

Check my edit. I updated my comment right as you posted. I have less than a degree of camber.

 

[Trebor355]

Yes, a 1/4" spacer (~7mm) just moves the wheel a quarter inch away from the strut, no disagreement there. The problem is, a et45 wheel is 10mm closer to the strut than the et35 wheels we usually choose. Is 1/4" enough? Maybe, but the smart money is on just getting a 10mm spacer and knowing it will work. Unless of course, you are trying to stay as close to the strut as you can, though I have no idea why you would.
The Voxx option looks a little better. You'd only need a 5mm spacer (should be ok on stock studs) but at 28.22 lbs you aren't going to reduce Unsprung, rotational mass much, if at all, depending on what wheels you are replacing.

 

[Trebor355]

Hey Dave, Your right I would never want to put my wheels closer to my struts,lol definitely want them further out,and yes I'm looking at voxx wheels,they will work. that tire and wheel site I think it's called Fitment ,they have the voxx wheels and there whole Description of them say that they will totally fit ,the 19×10s they have a 40 mm offset no rubbing No spacers needed that is what I wanted no spacers!! Dave I want to thank you again for taking the time to share your knowledge,and helping me out!!. I have to say I definitely learned a lot in the last 2 weeks about wheels tires back spacing and offset I can pretty much tell anybody what they need to know now that's why I love this hobby you learn something every day, It makes you want to share that knowledge with others to make their lives easier in the process of making the dream car that they want too!! thanks again

 

[Norm Peterson]

Check my edit. I updated my comment right as you posted. I have less than a degree of camber.

Got it.

Adjusting camber at the plates won't affect wheel to strut clearance at all. Adjusting camber at the strut to knuckle fasteners does (guessing by about 4 mm per degree for an 18" wheel).


Norm

 

[WildHorse]

40mm if you want like a 295mm+ tire up front, 35mm for like 285 & smaller up front. JMO.

 

[Dave TBG]

Got it.

Adjusting camber at the plates won't affect wheel to strut clearance at all. Adjusting camber at the strut to knuckle fasteners does (guessing by about 4 mm per degree for an 18" wheel).


Norm

Doh! You are absolutely correct, of course.

 

[NightmareMoon]

1/4" or 5mm to get back to ET40 is sufficient. There are no hub-centric spacers less than 12mm thick.

yeah, there are hubcentric 5mm spacers out there. I have a set. I also bought ahubcentric 7mm spacer but decided not to run it.

anyway, a 5mm spacer will give you more thread engagement than a 7mm would and 5mm should be enough to clear the strut. A 19x10 ET40 is a relatively common front wheel fitment. Might graze the strut when its on jackstands but it should be clear when on the ground.

 

[shogun32]

yeah, there are hubcentric 5mm spacers out there. I have a set. I also bought ahubcentric 7mm spacer but decided not to run it.

you can't make a hub-centric unless it's at least 12mm thick at least where it concerns the common usage. The OE hub tang is 9mm deep. If you mean the spacer ID is machined to the OE hub diamter, sure that's "hub-centric" but provides no wheel-centering ability and that's the aspect that is desired.

 

[Trebor355]

yeah, there are hubcentric 5mm spacers out there. I have a set. I also bought ahubcentric 7mm spacer but decided not to run it.

anyway, a 5mm spacer will give you more thread engagement than a 7mm would and 5mm should be enough to clear the strut. A 19x10 ET40 is a relatively common front wheel fitment. Might graze the strut when its on jackstands but it should be clear when on the ground.

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