19" or 20" wheels

[P2]

Greetings!
I am currently thinking about upgrading the wheels on my Mustang. I have a GT Premium (non PP) with the standard 19" wheels that came with the car when I purchased it. I'm thinking about changing to a 20" (20x10) squared setup. I will also be putting a little larger tire (285/35/20) as opposed to the tires that came with the car (255/40/19). My question is to any of you guys that may have already done this... do you see any issues with switching to a 20" wheel from a 19" wheel. Any issues with the ride, wheel alignment or fitment? Or should I stay with a 19" wheel (19x10) to avoid any potential problems. Any advice would be welcomed. Thanks in advance!

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[MCS]

If you are NOT lowered a 20x10 will be no problem. A 285/35R20 should also be okay but check with whomever you are buying the wheels from.

If you ARE lowered then most companies recommend 275/35R20 or 285/30R20 to prevent any kind of liner rub under load.

 

[Aggie1999]

I just switched from that same rim you have to a:
20X10 - 275/35/20 - front
20X11 - 305/35/20 - rear

I do find that at highway speeds my speedo shows a few mph lower, but once I get brave enough to figure out FORScan I'll fix that. Otherwise I haven't seen any issues.

 

[timd38]

My S550 is lowered and I have 20x10 with 285/35 tires. No issues that I have experienced in 9 years. My S650 Dark Horse and my S5550 GT/CS are the same basic architecture, so they should fit the same.

 

[P2]

I just switched from that same rim you have to a:
20X10 - 275/35/20 - front
20X11 - 305/35/20 - rear

I do find that at highway speeds my speedo shows a few mph lower, but once I get brave enough to figure out FORScan I'll fix that. Otherwise I haven't seen any issues.

Have you notice noticed any handling or ride difference since switching to a 20" wheel?

 

[Aggie1999]

Have you notice noticed any handling or ride difference since switching to a 20" wheel?

It "feels" a like I'm riding just a bit higher. Which is only about half an inch, but other than that, the only difference is that I get better traction when I decide to show the loud little Civic's or Genesis 4 bangers with more exhaust than engine what a real car can do.

 

[Cobrakit]

Another point, 20s will probably have smaller sidewalls. My last GT had 2 flat front tires where the sidewalks got cut, one in a pot hole and one on a man hole cover. They were 275/35-20s. Plus some tire shops won't do 30 series tires. Also, smaller sidewalls have rougher ride. So for me, it depends on wheel availability and how you plan on driving.

 

[young at heart]

Well. You know what Stangmode has to say about it.

Start around 5:50 if you’re interested.

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