Why doesn't the PP2 package have a square wheel setup?

[danpass]

Specs as listed on the Ford site:

• 19-inch x 10.5-inch (F) / 19-inch x 11-inch (R) Dark Tarnish Stainless-painted Aluminum Wheels
• 305/30/R19 Michelin® Pilot Sport Cup 2 Tires (Summer Only)


If you're going to use the same tires ANYWAY, front and rear, and for some reason cannot make the front 19x11 why not use 19x10.5 in the rear?

Because, again, same tires all around.

(this way you could rotate tires, at home / at the track, without having F and R sets of rims/tires)




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[Zelek]

Specs as listed on the Ford site:

• 19-inch x 10.5-inch (F) / 19-inch x 11-inch (R) Dark Tarnish Stainless-painted Aluminum Wheels
• 305/30/R19 Michelin® Pilot Sport Cup 2 Tires (Summer Only)


If you're going to use the same tires ANYWAY, front and rear, and for some reason cannot make the front 19x11 why not use 19x10.5 in the rear?

Because, again, same tires all around.

(this way you could rotate tires, at home / at the track, without having F and R sets of rims/tires)




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This is the one thing that bothered me even with my '17 PP. I changed it with the aftermarket for both lighter wheels, better and wider tires for all the benefits you just mentioned above.

 

[BmacIL]

Because Ford packaging standards. Ford. Ford.

 

[Norm Peterson]

Ford is probably still trying to ensure a little limit understeer even in the PP2. But the PP2's 1/2" wheel width difference is less wheel width stagger than the 1" that Chevy uses on the 1LE and ZL1.

1/2" narrower than the late Z/28 used.


Norm

 

[wildcatgoal]

Because Ford has to shoot themselves in the foot constantly. The flippin 2015-2017 PP should have had 19x10" square wheels, or even 19x9.5". Square makes the car so much better, and believe me it'll still understeer. Further de-values the PP2 to me as if they were truly square, they could be a HPDE set of wheels all day.

 

[jacknifetoaswan]

Because Ford has to shoot themselves in the foot constantly. The flippin 2015-2017 PP should have had 19x10" square wheels, or even 19x9.5". Square makes the car so much better, and believe me it'll still understeer. Further de-values the PP2 to me as if they were truly square, they could be a HPDE set of wheels all day.

They're still too heavy to be a great set of HPDE wheels.

I think they're a little narrower to ensure fitment. I'm not good with offsets and such, but I expect they'd need to go to a little more extreme offset in the front to match, and they wanted as flat a contact patch as possible in the rear for traction. I don't know how much a 1/2" more narrow wheel will make the car understeer.

JR

 

[Grintch]

Ford is probably still trying to ensure a little limit understeer even in the PP2. But the PP2's 1/2" wheel width difference is less wheel width stagger than the 1" that Chevy uses on the 1LE and ZL1.

1/2" narrower than the late Z/28 used.


Norm

Chevy uses different size tires front and rear, so different size wheels make sense.

I think the real answer is you need different offsets front and rear to run that much tire. So even if they had gone 19x10.5 all around, you still could not rotate front to rear.

Of course, Ford could have designed the car so it could use max size tires with the same offset front or rear. Or could have made changes to correct this. But didn't.

 

[Rampant]

It might have something to do with the sidewall. I was speaking with the guys that supplied wheels to viper race teams some time back (I know, different application/audience, but still...) and they did 0.5" wider rear wheels as well. This was specified by the race teams.

Since the fronts turn, maybe they like a slightly narrower width in the wheel to allow for more flex, or a more horizontal contact patch, or something? :shrug:

I am no tire engineer, but I would imagine there is some reason for it.

 

[wildcatgoal]

There certainly is a reason, a few. They've been mentioned here. I don't care, I would have preferred rotatable wheels. Saves money in the long term; not going to be THAT much faster because of difference size wheels.

 

[Paul@PKAUTODESIGN]

There is a larger demand for wider staggered wheels then square, but its weird since the wheels are staggered tires are square --_-

 

[Norm Peterson]

Chevy uses different size tires front and rear, so different size wheels make sense.

They haven't always staggered the tire sizes to suit staggered wheel widths. The 5th gen 1LE and Z/28 used the same size tires on all four. 1" wheel width difference in the 1LE, only 1/2" wheel width difference in the more seriously intended Z/28.

I think the real answer is you need different offsets front and rear to run that much tire. So even if they had gone 19x10.5 all around, you still could not rotate front to rear.

True, and front offset usually ends up being controlled by strut-side clearance. Ford is not going to work to 1/8" clearance or smaller.

Of course, Ford could have designed the car so it could use max size tires with the same offset front or rear. Or could have made changes to correct this. But didn't.

No smarter/more forward-looking than they were in 2005. Dammit.


Norm

 

[danpass]

.........

I think the real answer is you need different offsets front and rear to run that much tire. So even if they had gone 19x10.5 all around, you still could not rotate front to rear.

.........

Except that they are using the SAME tire, 305-30r19, at each corner.


That's where all the 'staggered, because' conversation comes to a halt.



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[Cdnspeed]

The track width between the front and rear is different even if they went with a Square setup it wouldnt' fit either in the rear or the front.

Slight stretch in the rear tires will make the rear tire break away more predictably.

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