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19'" Wheels on Stock Suspension?

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Old 05-08-2017, 09:09 AM
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Default 19'" Wheels on Stock Suspension?

I did a search but couldn't find anything somehow. I'm looking at ordering a custom set of wheels, and I wanted to know if 19" wheels would fit ok with the stock suspension setup. I might lower it down the road however. If they do fit, what would the best width and tire setup be for no rubbing issues? Thanks!
Old 05-08-2017, 09:28 AM
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Nikdsc5 is our local search expert....hopefully he'll chime in shortly.
Old 05-08-2017, 10:02 AM
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If the Forgstars F14s do, I dont see why any other 19 wouldnt, beside the offset difference
Old 05-08-2017, 10:08 AM
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there should be no reason they wouldn't work unless the specs are something goofy that wouldn't have fit in the first place.

what wheels are you looking at?
Old 05-08-2017, 11:58 AM
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What width and offset rim? What size and brand tires are you looking at front and rear?
Old 05-08-2017, 12:47 PM
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Originally Posted by jmilz28
What width and offset rim? What size and brand tires are you looking at front and rear?
That's what I'm asking. Trying to figure out what the best setup would be on 19" wheels.
Old 05-08-2017, 12:56 PM
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Here is my setup

https://ls1tech.com/forums/cadillac-...al-rubber.html
Old 05-08-2017, 01:25 PM
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Originally Posted by FD3SLS1
Awesome, thanks! Have you had any issues since then?
Old 05-08-2017, 01:25 PM
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Originally Posted by Anthony Toal
If the Forgstars F14s do, I dont see why any other 19 wouldnt, beside the offset difference
F14s will work if you limit yourself to 245 front and 275 rear tires. That's the extreme limit established by the stock suspension. We could have required people to run wide control arms with the F14s but Peter @ Forgestar didn't want to split the already-small market.
Old 05-08-2017, 03:45 PM
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Originally Posted by ForceFed4g63
Awesome, thanks! Have you had any issues since then?
I lowered the car about a 1.5 inches and it rubbed a little bit. So I rolled the lip of the rear quarters and it no longer rubs. Other than that no issues at all.
Old 05-08-2017, 03:47 PM
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well, unless you're going with something forged you're going to be stuck with the F14 sizes already existing (19x9/10 +40/42mm).

if you're going forged you should let me provide you wheels, hah.
Old 05-08-2017, 06:42 PM
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Originally Posted by FuzzyLog1c
F14s will work if you limit yourself to 245 front and 275 rear tires. That's the extreme limit established by the stock suspension. We could have required people to run wide control arms with the F14s but Peter @ Forgestar didn't want to split the already-small market.
Hey Fuzzy, what would your guess be with max tire width with wide wheel trailing arms, rolled fenders and sts spindles?
Old 05-08-2017, 07:29 PM
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Originally Posted by Anthony Toal
Hey Fuzzy, what would your guess be with max tire width with wide wheel trailing arms, rolled fenders and sts spindles?
The problem is that we couldn't move the rear wheel inboard enough due to the restrictive OEM trailing arm. If Peter would've agreed to require the Killernoodle or Creative Steel arms, the 6-lug F14 wheels would've been 11" wide with super deep concave.

Consequently, the largest rear tire you can run without rubbing (assuming you roll the fenders and upgrade the suspension) is 285. If you're willing to reduce tire diameter by one inch, you can squeak by on 295s, but that's it. Inboard, you've got tons of room, but there's no way to recover that room without going 5 lug and getting a custom offset wheel (which is what I recommend, incidentally).

In the front, the recommended size is 245 but there's nothing stopping you from going 255 or 265, particularly if you're willing to put a spacer behind the wheel (MightyMouse makes them at a reasonable price, btw). At the time, we didn't realize that the front trackwidth is narrower than the rear trackwidth. If we had, that front wheel would've been deep concave and +35mm offset, 9.5" wide.
Old 05-08-2017, 07:44 PM
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Originally Posted by FuzzyLog1c
The problem is that we couldn't move the rear wheel inboard enough due to the restrictive OEM trailing arm. If Peter would've agreed to require the Killernoodle or Creative Steel arms, the 6-lug F14 wheels would've been 11" wide with super deep concave.

Consequently, the largest rear tire you can run without rubbing (assuming you roll the fenders and upgrade the suspension) is 285. If you're willing to reduce tire diameter by one inch, you can squeak by on 295s, but that's it. Inboard, you've got tons of room, but there's no way to recover that room without going 5 lug and getting a custom offset wheel (which is what I recommend, incidentally).

In the front, the recommended size is 245 but there's nothing stopping you from going 255 or 265, particularly if you're willing to put a spacer behind the wheel (MightyMouse makes them at a reasonable price, btw). At the time, we didn't realize that the front trackwidth is narrower than the rear trackwidth. If we had, that front wheel would've been deep concave and +35mm offset, 9.5" wide.
Hmmm okay, guess i will be doing some measurements. I thought F14s were custom made as well? At least from talking to a dealer anyways syaing everything is made to order. So I was think maybe then having the correct offset made with the wide wheel trailing arms and sts spindles, and of course, roll some fenders
Old 05-08-2017, 07:57 PM
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Originally Posted by Anthony Toal
Hmmm okay, guess i will be doing some measurements. I thought F14s were custom made as well? At least from talking to a dealer anyways syaing everything is made to order. So I was think maybe then having the correct offset made with the wide wheel trailing arms and sts spindles, and of course, roll some fenders
Well, I made the F14s happen by drumming up enough support from the community. So I guess they're "custom-ish." That'll never happen again for the V1 platform because that 6-lug design requires safety certification and there isn't a big enough market to justify doing another, even smaller run.

If you want a custom offset, you'll have to look at 5x115 or 5x120 wheels. Forgestar has certified enough combinations of wheel offset and diameter to pretty much do anything you want. They're constantly tweaking their designs, by the way. Supposedly, the V1 wheel run was an example of their second iteration F14 design, which was about a half pound lighter than the stuff they previously did at approximately the same size and offset.
Old 05-08-2017, 08:10 PM
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Here's how the 6-lug F14s look from the next lane over:


The V1 is gorgeous from the 3/4 rear angle.
Old 05-08-2017, 08:21 PM
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I like the Forgestars, think of switching to the base cts hub and go from there then. I want to fit as much as conventionally as possible
Old 05-09-2017, 07:29 AM
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there's absolutely no reason to go with forgestar F14 if you're going to 5 lug swap. if you're doing that stay 6 lug and save money.
Old 05-09-2017, 08:06 AM
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Originally Posted by Bio248
there's absolutely no reason to go with forgestar F14 if you're going to 5 lug swap. if you're doing that stay 6 lug and save money.
Except that they're well-performing seven spoke flowformed wheels at a good price (~$1400).

The next step up is wheels like HRE FF01 that cost another thousand dollars per set. If you want forged wheels like the HRE P101, plan to spend $2400-2600 per wheel.
Old 05-09-2017, 08:41 AM
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Originally Posted by Bio248
there's absolutely no reason to go with forgestar F14 if you're going to 5 lug swap. if you're doing that stay 6 lug and save money.
They are a good company at a good cost, to get one custom made with the right offset to move the tire as much inboard as possible while keeping the tire flush with a rolled fender would be my goal. There isnt a lot of other companies as well that would do a base cts rim to 10 or even 11 inches wide. So getting one custom made from forgestars would be my cheapest and effective option. like Fuzzy said, HREs are ridiculous in price, good wheels, just hurts to much in the pocket for me.


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