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285/35/20 vs 285/35/19

Jonv828

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Hey guys,
I thought 19” wheels were a better ride because of the added sidewall. But i see a lot of members here using 285/35/19. Would the ride quality be the same as a 285/35/20?
Im guessing the sidewall would be the same thus, same type of feel driving?
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MAGS1

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Sidewall is the same height. I run 285/35r20 in the summer and the ride quality isn’t harsh at all. Is it as soft as the 235/50r18 I run in winter? No, but it’s not bad at all. A 30 profile would probably be a bit harsh. Those that run 19’s for a softer ride are probably running 275/40r19
 

NightmareMoon

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Assuming same tires in those sizes, yes the sidewall cushion would be basically the same.

Check the wheel weights though, even with the same sidewall, if the 20" wheel and tire package is heavier that will mean more force for the suspension to absorb when the wheel hits a bump.

Usually 20" tires are heavier than 19" tires and 20" wheels are heavier than 19" wheels, but it does depend. Some 20" wheels are lighter than many 19" wheels, etc.
 

MAGS1

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I’m on 20x10 et35 with 285/35r20 in the summer. Stock suspension. It is noticeable going from the stock 235/50r18 I run in winter. Fills in nicely IMO. Visually, 275/40r19 won’t look much different.

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Joshinator99

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I’d go with the 19’s unless you have really nice roads. I’ve got 20’s on my Camaro and it rides too hard here in New England…roads are terrible. We did 19’s on the Mustang and it’s great.
 

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MidwayJ

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I’d go with the 19’s unless you have really nice roads. I’ve got 20’s on my Camaro and it rides too hard here in New England…roads are terrible. We did 19’s on the Mustang and it’s great.
That's only if you're running a thinner sidewall on the 20s. In the OP's example it's the same so there shouldn't be a ride quality difference.
 

MAGS1

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We don’t have the greatest roads here in the Chicago area either and my 285/35’s are fine. Don’t want to take on any potholes for sure but small bumps and stuff are fine. It is a noticeable difference compared to my winter set which are 235/50 but I wouldn’t say the ride is overly harsh. You do feel more of the bumps though. If that’s not appealing, I’d go 275/40 in a 19x9.5 or 19x10 wheel.
 
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Jonv828

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Is 275/40 considered inferior performance wise against a 285/35?
Considering same 19x10 wheel?
 

NightmareMoon

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Is 275/40 considered inferior performance wise against a 285/35?
Considering same 19x10 wheel?
Not really.

Your tire brand/model selection is going to matter a lot more than the 275/40 or 285/35. Its 4% more width, which is a lot less than 4% in grip (after pressure/coefficient of friction). The smaller sidewall might feel slightly more responsive, or you might never notice. The 40 sidewall should ride a bit better over bumps. I like the look on 285/35 and the 275/40 would look a little weird on me on the front of the car, but YMMV
 

MAGS1

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Is 275/40 considered inferior performance wise against a 285/35?
Considering same 19x10 wheel?
I guess it depends. On the street, not really. The 275/40 will be a little softer ride just because you have more sidewall. You’ll get a little more feedback with the 285/35. If you’re talking track performance, I’ll defer to others with more experience there. 305/30 or 305/35 square seems to be a popular setup for track
 

RedTetsu13

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Is 275/40 considered inferior performance wise against a 285/35?
Considering same 19x10 wheel?
FYI this is what 285/35-19 looks on 19x9.5

Depending on which tire manufacturer you go with it might look a little different/more or less buldge but this would give you some visual idea.

In terms of looks I do agree with @NightmareMoon though. 285/35 just looks better but you will also most certainly have more tire choice at 275/40 (another benefit going bigger).


https://www.mustang6g.com/forums/threads/daily-driver-square-tire-setup.196137/post-3929329
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