Help with Front Wheels

[AnthonyL]

I jumped the gun on ordering some wheels with AMR. They had a sale on the 19x11 Charcoals for $119 each so I ordered them thinking I would wait for the fronts to go on sale too. I didn't realize that the 19x8.5 fronts would not fit my 2017 Performance pack. I went to cancel the order less than an hour later to findout they couldn't. So my question is can I fit the 19x10 on the front of my car?

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[AnthonyL]

From what I understand the 19x10 they offer are +48 offset.

 

[shogun32]

you need a 20-25mm 8-13mm spacer, but yes, you *should* be able to use them - assuming the problem is the spokes and not the barrel itself.

I'm just amazed AMR would screw up so badly as to not make damn sure all their 19" wheels properly clear the 6-pot Brembo. And not bury the "Oh they don't fit PP1" in a freaking question at the bottom of the page! Just SO WRONG.

jeezus it gets worse! The picture of their 19x8.5 wheel actually has a Brembo labeled caliper. Did they photoshop that in and then bury that it doesn't actually work? Or do the website operators have no earthly clue what they're talking about?

 

[AnthonyL]

you need a 25mm spacer, but yes, you can use them.

Would that look appropriate? Sorry I've always had issues with understanding offsets on wheels.

 

[shogun32]

If you start with ET48 and add a 20mm spacer the ET is now 48-20=28.
Hmm, lots of people run 19x10 ET35 or 40 so all you need is a 8mm up to 13mm (1/2").

I hope the barrel clears the calipers though - ie. the problem is the spokes and the spacer solves the problem.

 

[AnthonyL]

If you start with ET48 and add a 20mm spacer the ET is now 48-20=28.
Hmm, lots of people run 19x10 ET35 or 40 so all you need is a 8mm up to 13mm (1/2").

I hope the barrel clears the calipers though - ie. the problem is the spokes and the spacer solves the problem.

So are you saying as the wheels are right now they would sit too far inside the wheel well? The spacers would bring them out flush and enough where the back of the wheel wouldn’t hit anything? Well hopefully.

 

[shogun32]

ET48 as-is wouldn't seat properly on the spindle (recessed too far) because the inner rim would be banging on the suspension member if it didn't also hit the caliper face. So yes the spacer pushes things back out and clear.

 

[NightmareMoon]

For an 19x10 ET 48, it might fit with an easy 5mm spacer (as far as the strut is concerned). That fit is about 1mm less than the backspace on a PP2 front wheel, and its as close to the strut as you can get and still "fit" but it should barely be ok... unless the spokes hit the caliper, which is harder to determine without trying it.

to get a 8-13mm spacer in there you'd need longer studs. A 5mm spacer will work without extended studs.

 

[AnthonyL]

For an 19x10 ET 48, it might fit with an easy 5mm spacer (as far as the strut is concerned). That fit is about 1mm less than the backspace on a PP2 front wheel, and its as close to the strut as you can get and still "fit" but it should barely be ok... unless the spokes hit the caliper, which is harder to determine without trying it.

to get a 8-13mm spacer in there you'd need longer studs. A 5mm spacer will work without extended studs.

Im thinking this may work as well. Im going to wait for the rear wheels I ordered to come in to see if I do like them 100%. If so I'll order one of the 19x10s and a 5mm spacer an see what happens. Looking on tirerack there are a good bit of the wheels are 40-43 offset. Worth a shot I guess.

 

[Apex Wheels]

There's no reason you should have spoke clearance issues with that wheel and a 5-8mm spacer, but keep in mind 5mm is about the max spacer you can run on the stock wheel studs, so you'll likely need to install longer ones from ARP.

The only other thing you'll need to look at is the shape of the barrel, many wheels use a tapered barrel design because it's easier (cheaper) to produce, but it significantly reduces brake clearance.

 

[Fly2High]

For an 19x10 ET 48, it might fit with an easy 5mm spacer (as far as the strut is concerned). That fit is about 1mm less than the backspace on a PP2 front wheel, and its as close to the strut as you can get and still "fit" but it should barely be ok... unless the spokes hit the caliper, which is harder to determine without trying it.

to get a 8-13mm spacer in there you'd need longer studs. A 5mm spacer will work without extended studs.

I was under the impression that a PP2 front wheel was a 19 x 10.5 ET 24. I would think you would need a 24mm spacer on that ET48 to match the PP2 fitment (centerline to centerline).

If all you want is to match where the inside placement of the PP2, an 18mm spacer would move the 19x10ET48 such that it is within 0.01" of the PP2's inner edge of the wheel. Got this info from https://www.tire-size-calculator.info/ putting in only the wheel data without the tire data.

 

[NightmareMoon]

I was under the impression that a PP2 front wheel was a 19 x 10.5 ET 24. I would think you would need a 24mm spacer on that ET48 to match the PP2 fitment (centerline to centerline).

If all you want is to match where the inside placement of the PP2, an 18mm spacer would move the 19x10ET48 such that it is within 0.01" of the PP2's inner edge of the wheel. Got this info from https://www.tire-size-calculator.info/ putting in only the wheel data without the tire data.

Yeah I think you're right, thanks for the correction.

The PP2 wheel is probably a 10.5 ET 24 and a 10" ET48 and with a 5mm spacer would have 13mm less backspace than the PP2 front wheel, but the 10" ET48-5mm still _probably_ clears the strut, but its going to be very close (~5mm to spare). I'm basing my guess at clearance based on my own car and experience with a three different sets of wheels, and then using some basic math to extrapolate to other wheel offsets.

For comparison, my car currently has a 10" ET35 wheel mounted w/ a 5mm spacer (so effectively an ET30) and a 285 MP4S tire, and it has about 1 middle finger width or 18mm clearance between the tire sidewall and the strut body in that configuration. A 10" ET48 wheel with a 5mm spacer (effectively an ET43) and the same 285 MP4S tire would have 13mm less clearance than my car does, leaving ~5mm to spare. It very tight, but probably clears by a gnat's ass.

Ford factory fitments seem to give at least ~18mm of clearance from the tire to the strut. IDK why specifically, but that's what I measure. You can definitely get closer than that on most cars w/o issue, and I've run as close as 4mm without problem, but how close is between you and your personal tire god to decide.

 

[shogun32]

ut the 10" ET48-5mm still _probably_ clears the strut,

19x10.5 ET35 barely clears the strut (~4mm) 19x10 ET45 will be scraping the strut.
19x10 ET40 is known to work. All figures relate to the rim. Tires will make it worse.

 

[Fly2High]

for reference since they were brought up, PP2 wheels are:

Front: 19 x 10.5 ET24
Rear 19 x 11 ET48

All wheels, front and back, take 305/30R19 Cup2 tires.

'ET', for those that do not know, refers to the offset of the wheel's hub in mm. Positive ET means the hub is moved out away from the car causing the wheel, when mounted to be pushed deeper into the wheel well. A negative ET means the hub is moved toward the car causing the wheel when mounted to be moved away from the car. When changing from a small ET value to a larger ET value, the wheel will be moved further into the wheel well and closer to the centerline of the car thereby reducing the track width of that axel.

 

[AnthonyL]

Ok I ordered one of the wheels and some 5mm spacers. This is what that look like bolted up. Definitely tight an I don’t know if you gain more or less room when the shock is compressed and also don’t know how much room is needed for the tire. I’ll look for your guys judgement on sending them back or keeping them. No issues with room on the brakes though.

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