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Old 03-31-2016, 02:17 PM   #1
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19x9.5 and 19x10.5 - Tire Options?

Hey Guys-

I'm picking up a set of the RTR Tech 7 wheels: 19x9.5 in the front and 19x10.5 in the rear.

However, I'm totally clueless when it comes to tire sizes.

What tire size(s) should I be looking at? I'm looking for a tire that is designed to
"fit" that wheel....meaning, I want the "height" of the tire to be the same as my stock wheels (brembo) and the width of the tire to fit the width of the wheel, meaning it's not bulging over.

Essentially I'm looking for a "stock" fit on those wheels.
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Old 03-31-2016, 04:17 PM   #2
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After a little more digging, I found that AmericanMuscle.com equips them with:

(2) 245/45-19 Pirelli All Season P-Zero Nero Tire
(2) 275/40-19 Pirelli All Season P-Zero Nero Tire

If you buy their wheel & tire package.

The stock Brembo wheel tire size is: 255/40-R19

So if I'm understanding the tire numbers correctly, those should line up with the stock Brembo "tallness" meaning my speedo won't be affected.
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Old 03-31-2016, 04:33 PM   #3
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I run a 275 40 on 19x9.5 all around. I'd run a bigger tire then a 275 for a 10.5 wheel but I also hate the stretched tire look with a passion. You could even run 305 in the back. All the wheel and tire packages offer too small of tires imo.

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Old 03-31-2016, 04:43 PM   #4
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Quote:
Originally Posted by k1DBLITZ View Post
After a little more digging, I found that AmericanMuscle.com equips them with:

(2) 245/45-19 Pirelli All Season P-Zero Nero Tire =27.68" dia
(2) 275/40-19 Pirelli All Season P-Zero Nero Tire =27.66" dia

If you buy their wheel & tire package.

The stock Brembo wheel tire size is: 255/40-R19 =27.03" dia

So if I'm understanding the tire numbers correctly, those should line up with the stock Brembo "tallness" meaning my speedo won't be affected.
The calculated diameters are as I show. The actual tire may vary a bit by mfr.
The differences shown are within about 2.5% or what's considered generally acceptable. For example at 60 mph your speedo would be off by 1.4 mph. That is speedo would be reading about 58.6 mph.
There are loads of sites that compare tire size and speedometer effects for you. Here are a couple...
https://www.tacomaworld.com/tirecalc...5r19-255-45r19
This one lets you compare effects of offsets as well.
Online Wheel and Tyre Fitment Calculator. Offset, Tyre Stretch and Speedo Error | Will They Fit
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Old 03-31-2016, 04:53 PM   #5
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There are 295 width tires that are designed for 10.5" rims. For example Michelin PILOT SUPER SPORT - 295/35ZR19 - Rim width range: 10-11.5" design rim width: 10.5"
Review tire Rack for various tire sizes and recommended rim widths.
I would not recommend the Pirelli All Season P-Zero Nero Tires.
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Old 03-31-2016, 07:35 PM   #6
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I didn't see a way on tirerack.com to shop by wheel size - it always asks for tire size?

EDIT: Ok, so I see how to pick wheel diameter, but I don't have an option for width.
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Old 03-31-2016, 08:03 PM   #7
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Once you get to the list of tires, pick one, then scroll down and choose SPECS.

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Tire rack doesn't appear to have many choices for 295/35 tires. But it shows you specs for many tire sizes.
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Old 04-01-2016, 07:31 AM   #8
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Thanks.

How did you come up with a 295/35-ZR19 tire?

AM is equipping the rears with a 275/40-19.

That's the part I don't understand how to calculate. How do you know if a tire is too wide or too narrow to fit on a 10.5 inch wheel?
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Old 04-01-2016, 07:49 AM   #9
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Quote:
Originally Posted by k1DBLITZ View Post
Thanks.

How did you come up with a 295/35-ZR19 tire?

AM is equipping the rears with a 275/40-19.

That's the part I don't understand how to calculate. How do you know if a tire is too wide or too narrow to fit on a 10.5 inch wheel?
You look under the specs tab on whatever tire you look at on tirerack. AM equipping the rears with 275 wide on a 10.5" rim is ****ing moronic. You want the section width of the tire to be minimum 1/2" wider than the rim since rim width is measured from inside lip to inside lip and does not account for the actual lip itself. I'd say more like 3/4" to 1" wider section width than the rim to be safe.

275, even a BFG Comp 2 is going to be too narrow for a 10.5" rim and the BFGs run huge. And that's something else, some brands run small which is why you should always check the exact specs on tirerack.

Lastly... remember, the sidewall number is not a static thickness, it is a percentage. You can have a 35 sidewall just as thick or even thicker than a 40 sidewall depending on how wide the tire is.
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Old 04-01-2016, 09:23 AM   #10
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Sounds like I need to go with a 295/35 for the rear. I've got my eye on the Michelin Super Sports.

Is a 245/45 ok for the front in your opinion?

EDIT: OK. I think I might have a grasp on this....

I think I need a 265/40 for the front. The Tire Rack specs state it is for a rim that measures 9.5 in width. A 265/40 on the front will put me at +.8% of the rears at 295/35



Or am I doing this wrong?

It seems like the math doesn't workout to where I can have both tires the same size in diameter.

And lastly, how can I confirm that these will FIT in the wheel wells? I would hate to roll a fender.

This AM article has me slightly concerned: http://www.americanmuscle.com/simple...de-wheels.html They say the widest wheel you can put up front is 9 but these RTR wheels are 9.5

"The front end of a Mustang is set up in a way that will fit at largest a 9” rim. The brakes, struts, A-arms, etc. are located in or around the wheel well, and the wheel and tire are used to hold them in place. Because of their location, it's impossible to use a wider wheel without a significant amount of rubbing on either the inside or outside."

Although these guys are running 9.5 up front with no problems: http://www.allfordmustangs.com/forum...ront-pics.html

It seems I need to know what the offset is on the RTR wheels to know for sure if they will clear.

Man, this is such a pain in the rear to figure all this crap out.
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Old 04-01-2016, 09:50 AM   #11
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You need a 265 minimum for a 9.5" rim up front dude...

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Old 04-01-2016, 01:50 PM   #12
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I'm running 265/35 on 9in front and 305/30 on 10.5 in rear. Michellin PS2's.
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Old 04-02-2016, 09:21 AM   #13
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Quote:
Originally Posted by k1DBLITZ View Post
Thanks.

How did you come up with a 295/35-ZR19 tire?

AM is equipping the rears with a 275/40-19.

That's the part I don't understand how to calculate. How do you know if a tire is too wide or too narrow to fit on a 10.5 inch wheel?
You seem to be choosing a tire size based on those wheel sizes you mentioned. Generally (there are exceptions of course) one would pick a desired tire size and then decide what wheel size to go with.
You mentioned a desire to keep close to your current tire diameter to avoid having to adjust for speedometer change. Based on that criteria I looked at what tire widths in combination with their profile ratio would come within an acceptable diameter. Which is generally said to be within 2 to 3% of the original tire tire diameter.
I found the a 285/40, a 295/35 and a 305/35 fit the criteria for the 10.5" rim width as well as an acceptable match for the tire diameter.
I just happened to use the 295/35 in my example.

Just to supplement scottydsntknow's comments on the sectional width of the 275's, if you look closely at the chart I am attaching from tire rack, you'll see that the sectional width they show is almost always 1" to 1.5" wider than the "MEAS. RIM WIDTH". (Also referred to as the "design rim width".)
Note that the sectional width of the tire changes slightly based on the rim width that it's mounted on.
This following link explains it a bit.
Tire Tech Information - Tire Specs Explained: Section Width

So the tire width is up to you, followed by whatever it takes to get there.

EDIT: Keep in mind that there are limits to tire widths that will fit without interference but you must take into consideration the wheel offset. For example, if someone says they have 305's like Cobrakit has, you should compare wheel offsets as well.
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Old 04-04-2016, 02:31 PM   #14
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Rear wheels just arrived. They are so light!

Fronts are back ordered.
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Old 04-04-2016, 02:48 PM   #15
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Keep in mind that there are limits to tire widths that will fit without interference but you must take into consideration the wheel offset. For example, if someone says they have 305's like Cobrakit has, you should compare wheel offsets as well.
Good point, but I'm running track pac wheels widen, so they added material on inside. Fits perfect and no tire rub, but pricey.
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Old 04-10-2016, 03:48 AM   #16
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The RTRs look great.


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Old 04-10-2016, 04:29 PM   #17
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Yeah... I can't wait to see them ON the car.

I've only seen them on a 2016 Mustang in the newest Need for Speed game. HAHAHAHA

It was an instant buy after I read they were only 23lbs.
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Old 04-10-2016, 09:39 PM   #18
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Ok. I've been doing a ridiculous amount of research and investigation.

Right now I'm leaning towards:

295/35/19 - Rear

275/35/19 - Front

In comparison to the stock Brembos that will put me at:
Front


Rear





I really like the way the vehicle corners today with the stock Brembos.. but I could definitely use a little more traction out back for those straight line encounters.

I think I'd almost lean in the direction of peel vs bulge to keep the sidewalls stiffer.

Basically I want the best of both worlds so I have to compromise a little in both....

In other news.....what is the point of this? Talk about peel....



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Old 04-11-2016, 09:25 AM   #19
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Quote:
Originally Posted by k1DBLITZ View Post
Ok. I've been doing a ridiculous amount of research and investigation.

Right now I'm leaning towards:

295/35/19 - Rear

275/35/19 - Front

In comparison to the stock Brembos that will put me at:
Front


Rear





I really like the way the vehicle corners today with the stock Brembos.. but I could definitely use a little more traction out back for those straight line encounters.

I think I'd almost lean in the direction of peel vs bulge to keep the sidewalls stiffer.

Basically I want the best of both worlds so I have to compromise a little in both....

In other news.....what is the point of this? Talk about peel....



Because the jdm life bro. Hella flush yo. Quarter mile at a time yo.

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Old 04-11-2016, 01:11 PM   #20
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Quote:
Originally Posted by scottydsntknow View Post
You look under the specs tab on whatever tire you look at on tirerack. AM equipping the rears with 275 wide on a 10.5" rim is ****ing moronic. You want the section width of the tire to be minimum 1/2" wider than the rim since rim width is measured from inside lip to inside lip and does not account for the actual lip itself. I'd say more like 3/4" to 1" wider section width than the rim to be safe.

275, even a BFG Comp 2 is going to be too narrow for a 10.5" rim and the BFGs run huge. And that's something else, some brands run small which is why you should always check the exact specs on tirerack.
That is the same size tire RTR recommends as well. My guess is for drifting or track duty you want less sidewall flex. (quicker response, more predictable/consistent handling)
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Old 04-11-2016, 01:20 PM   #21
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For anyone who finds this post in the future, the offset of the RTR Tech 7 Wheels are as follows:

9.5 - 33

10.5 - 45
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Old 05-14-2016, 07:52 AM   #22
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Great wheel choice! For mine I put on Michelin pilot SS. 255/40 up front and 295/35 in the back.
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Old 05-14-2016, 08:10 AM   #23
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Can you post a few pics of the front tires?

Thanks.
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Old 05-14-2016, 09:14 AM   #24
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Here is one. I'll get an angle for you.



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Old 05-14-2016, 09:55 AM   #25
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Here you are.





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Old 05-14-2016, 01:12 PM   #26
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Looks good! Nice angles. Did you happen to snap any pics of the rear tires while you were out there?
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Old 09-10-2016, 01:25 PM   #27
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The rear wheels finally arrived after being on back order for 4+ months.

I went with 295/35/19 rear and 275/35/19 front. Michelin Pilot Super Sports.
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Old 09-13-2016, 08:26 AM   #28
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.....and here's a quick video. Static pictures don't do these wheels justice.

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