20 inch wheel help, SVE Series 3

[Jandino63]

Are you running any spacers? How flush are you on those 20” wheels?

I’m loving all your 20” set ups. It seems the consensus is 275(285)/35/20 up front and 305/35/20 in the rear for this 8.5/10 staggered set up. I appreciate all the help.

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[MaskedRacerX]

Are you running any spacers? How flush are you on those 20” wheels?

They're perfect, no spacers, the spec is a 20x10 ET35, 20x11 ET50

Here's a down-the-side angle that gives you a pretty good sense of the fitment (note this is pre-no-grill-plus-Velossa ):

I also meant to add: while the front-to-rear ratios are the exact same as OEM, the overall height is a touch taller, as a result, my 3:73 stock rear end ratio calculates out to like a ~3:62 (if I recall correctly).

 

[MaskedRacerX]

I’m loving all your 20” set ups. It seems the consensus is 275(285)/35/20 up front and 305/35/20 in the rear for this 8.5/10 staggered set up. I appreciate all the help.

Well, I'd run a 10" wide front and a 11" rear with those sizes, otherwise, I might downsize just a touch, do a 295 rear, 265 or 275 front.

 

[Jandino63]

Well, I'd run a 10" wide front and a 11" rear with those sizes, otherwise, I might downsize just a touch, do a 295 rear, 265 or 275 front.

Just to clarify because I’m tire incompetent apparently, why would I need to downsize tires with 8.5/10. Fitment?

 

[bluebeastsrt]

305/35 in the rear?

Yes. Heres a couple photos. Ill post pics of them on the car when i get home from work tonight. Nitto 555g2 305/35-20.

 

[MaskedRacerX]

Just to clarify because I’m tire incompetent apparently, why would I need to downsize tires with 8.5/10. Fitment?

You'll get other answers, mostly as a "I put X sized tire on Y sized wheel and it fit fine", but there's a fitment where the wheel and tire are perfectly matched, not stretched (undersized tire) or bulging out past the lip of the wheel (oversized tire).

Most charts will show that a 10" wheel has this fitment suggestion (in terms of section width).:

Min 255
Opt 265 or 275
Max 285

and for an 8.5"

Min 225
Opt 235 or 245
Max 255

(opt = optimum)

You can generally get away with a little upsizing, especially if tire has a narrower width, i.e., different manufacturers measure from a slightly differently, so some tires are known wider/narrower (by like a 1/2 size).

Just for reference, the OEM PP wheels are 8.5" in front with a 255 and 9.5" in the rear with a 275. I might do a 295 on a 10", that's pretty close - but there's no way I'd run a 285 on a 8.5", I'd probably stick with a 265.

FWIW, I'm running Nitto 555 G2.

 

[choate]

U don't have to. a 305/35 will work fine. just bulge a little and not have a full contact patch

 

[Bluelightning]

Just to clarify because I’m tire incompetent apparently, why would I need to downsize tires with 8.5/10. Fitment?

You don't have to.

 

[Jandino63]

You'll get other answers, mostly as a "I put X sized tire on Y sized wheel and it fit fine", but there's a fitment where the wheel and tire are perfectly matched, not stretched (undersized tire) or bulging out past the lip of the wheel (oversized tire).

Most charts will show that a 10" wheel has this fitment suggestion (in terms of section width).:

Min 255
Opt 265 or 275
Max 285

and for an 8.5"

Min 225
Opt 235 or 245
Max 255

(opt = optimum)

You can generally get away with a little upsizing, especially if tire has a narrower width, i.e., different manufacturers measure from a slightly differently, so some tires are known wider/narrower (by like a 1/2 size).

Just for reference, the OEM PP wheels are 8.5" in front with a 255 and 9.5" in the rear with a 275. I might do a 295 on a 10", that's pretty close - but there's no way I'd run a 285 on a 8.5", I'd probably stick with a 265.

FWIW, I'm running Nitto 555 G2.

Thank you for taking the time to clarify. I understand what you are saying now.

Weirdly I saw a 17 GT in the parking lot today and they were running 275/40/20 upfront and 315/35/20 in the rear and the tires just seemed too meaty.

 

[MaskedRacerX]

Thank you for taking the time to clarify. I understand what you are saying now.

Weirdly I saw a 17 GT in the parking lot today and they were running 275/40/20 upfront and 315/35/20 in the rear and the tires just seemed too meaty.

I guess you mean the sidewalls were a little too thick, yeah, the 315/35 is a little taller sidewall, too much sidewall and it starts looking like a truck tire.

The series, the 30/35/40 is a percentage of the width (the 275/285/305) that the widewall is tall, so if you maintain the same sidewall series, like a 35, and go wider, the tire sidewall (and overall height) will also increase.

The 275/40 is a good bit taller than my 285/35:

Above is from a good tool to knock around with - has a neat visualization too:

https://tiresize.com/calculator/

 

[1bad66]

Thank you for taking the time to clarify. I understand what you are saying now.

Weirdly I saw a 17 GT in the parking lot today and they were running 275/40/20 upfront and 315/35/20 in the rear and the tires just seemed too meaty.

They would be too meaty...275/40 and 315/35 are quite tall. 275/35 and 305/35 or 315/30 would've been a much better choice in my opinion.

 

[bluebeastsrt]

Found an old photo off of facebook. Showing 265 front. 305/35 rear.

 

[choate]

I've got these wheels in 18" on my 03 Cobra. Love them. 275/35r18 and 305/35r18 on 18x9/18x10. Love em

 

[Roadway 5.0]

If you have OEM springs then get 35 series tires. If you have lowering springs, or plan to lower 1” or more, then get 30 series tires.

The ride will be better than what you have in either instance; your stock wheels are heavy and prevent the suspension from working most efficiently.

I’m a fan of 275/30/20 and 305/30/20 and would be perfect on a 1”-1.15” lowered car with flush backspaced wheels. Plus the handling would feel a bit more crisp and responsive if you get the right performance summer tire.

 

[Jandino63]

If you have OEM springs then get 35 series tires. If you have lowering springs, or plan to lower 1” or more, then get 30 series tires.

The ride will be better than what you have in either instance; your stock wheels are heavy and prevent the suspension from working most efficiently.

I’m a fan of 275/30/20 and 305/30/20 and would be perfect on a 1”-1.15” lowered car with flush backspaced wheels. Plus the handling would feel a bit more crisp and responsive if you get the right performance summer tire.

No plans to lower for a bit. But when I do I’m glad I know I’ll need lower profile tires. Thank you!

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