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Old 11-21-2015, 06:17 AM   #1
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Backspacing and offset

I am upgrading right now as we speak as my 2015 GT PERFORMANCE PACKAGE is in the body shop for a few things I wanted done. I want to purchase this week a staggered set of Niche Millan M134's. I'm going with 20x10.5 w/315/35/20 in the back and 19x9.5 w/275/40/19 up front. Can someone tell me the correct backspacing and offset for the front set? Is the offset 35mm or 45mm? Or what? Thanks in advance.


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Old 11-23-2015, 08:57 PM   #2
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35mm is all Niche Makes in M134 for 4.5" bolt pattern

Niche makes the 19X9.5 M134 for the Mustang fitment in one offset, 35mm. The 35mm should move the rim edge 16.35mm closer to the fender line than your stock wheel. The stock PP wheel is 9" and 45mm offset. As I do the math this puts the outer rim edge .643" farther out. But I would check with the wheel dealer its likely they have sold hundreds of 9.5s to Mustang owners and they may even have some pics.

As an example I am dealing with Get Your Wheels and that are selling 19X10 square fitments with 275/40zr19. They sent me lots of pics of S550s with that setup. But these are Forgestar wheels. Regardless your dealer should be able to show what the Niche wheel would look like on your car. In any case I looked at the Niche website to find the measurement and thats where I see they only have one listing in the Mustang fitment for the 19x9.5 M134.
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Old 11-24-2015, 05:30 AM   #3
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I live in Puerto Rico now and when I mention offset and back spacing they look at me like I'm a regard. Here aftermarket is with the ricers not American muscle. So resources are limited. Sure I can buy in line, but shipping is ridiculous and for these wheels it's almost 800.00. That's the price of 2 rims. Ugggh

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Old 11-24-2015, 02:37 PM   #4
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Unhappy Whoa there!



Did you mean to say the shipping for 4 wheels to Puerto Rico is like $800???
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Old 11-24-2015, 05:50 PM   #5
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Really decent car you have

I forgot to tell you you have a real looker there in the picture.
Mine won't look that good ever.
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Old 11-24-2015, 09:25 PM   #6
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Road Dog appears to be right on the money except I see the 20" have a 40mm offset.

Why you're going with 20" rears and 19" fronts I can only guess you want to use your existing rear tires for the front on you new set-up. (?)

As you probably already know, your rear tires will have a larger diameter than stock and would result in a -3.56% speed error and must be corrected.

Looks like the front tires will end up being about 5/8" bigger in diameter resulting in a relatively small speed error to your ABS brake system (-2.28%) Probably not enough to worry about. (?)

The following site will allow you to compare existing wheels and tires to new wheels and tires.

Online Wheel and Tyre Fitment Calculator. Offset, Tyre Stretch and Speedo Error | Will They Fit

Did you check out Amazon.com for these wheels?
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Old 11-26-2015, 04:39 AM   #7
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Quote:
Originally Posted by Road Dog View Post


Did you mean to say the shipping for 4 wheels to Puerto Rico is like $800???
Yes

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Old 11-26-2015, 04:57 AM   #8
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Quote:
Originally Posted by Diehard View Post
Road Dog appears to be right on the money except I see the 20" have a 40mm offset.

Why you're going with 20" rears and 19" fronts I can only guess you want to use your existing rear tires for the front on you new set-up. (?)

As you probably already know, your rear tires will have a larger diameter than stock and would result in a -3.56% speed error and must be corrected.

Looks like the front tires will end up being about 5/8" bigger in diameter resulting in a relatively small speed error to your ABS brake system (-2.28%) Probably not enough to worry about. (?)

The following site will allow you to compare existing wheels and tires to new wheels and tires.

Online Wheel and Tyre Fitment Calculator. Offset, Tyre Stretch and Speedo Error | Will They Fit

Did you check out Amazon.com for these wheels?
No I like the setup of different size rims front and rear as I had on my 99 GT. The tires and rims are going to be new. No using the crappy Pirelli Zero's. I bought Continental Contisportcontact VMAX tires already. Rears are 315/35/20 and fronts are 275/40/19. The max on offset for the rear 20x10.5 is 30mm and the front 19x9.5 is 35mm. So I am guessing by your all's input that it is going to push the set up outward. The correct offset for this set up is rear 59mm and front is 45mm. Also there is a hub bore difference too. My car has a 70.6 hub bore, the vote on the rims is 72.6, a difference of 2mm. That's not a lot of difference so I don't know if I should make my own 2nd rings or just leave it alone being it only is 2mm.



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