square tires on staggered wheels

dyingbreed · 10-02-2022, 07:18 PM

SS 1LE has these from factory:
Front: 20x10 wheel 285/30 R20
Rear: 20x11 wheel 305/30 R20

I'm currently enjoying big discounts when I replace Continental Extreme Contact Sport. They have a 30,000 mile warranty and I get about 12k out of a set. (this is on another car with square wheel and tire set up).

The warranty states they half it for staggered cars. Given 4 tires for SS 1LE are around $2,000 installed, I'm wondering how I can put square tires on and keep the full warranty. The obvious answer is to run 20x10 wheels on the rear but what if I keep the 20x11. Can I run a 285 tire on the 11 wide rear rim? Or how about 295 all round? Anyone thought of this or done it?

I know the performance will not be quite as good, but:

this is not a small amount of money to be saved (potentially $1,000s)
if I don't like it I can always change back after a few burnouts
AFAIK it will not be dangerous or cause damage, just not optimized (rear rim will be more vulnerable to curb rash)
I live in dry warm weather year round

mariojas · 10-02-2022, 08:45 PM

This is handy. https://m.roadkillcustoms.com/tire-w...y-wheel-width/
Shows the minimum, optimum, and maximum width of tire for a rim. But probably the most reliable information is from tire manufacturer - they should specify what rim width you should use.

Aquarius · 10-02-2022, 09:23 PM

I run 295/35 R19's on all 4 corners on 10.5" wheels. Its doable, and I have the Continental Extreme Contact Sports. It is a tight fit for me, and I have @ 10mm of poke front and back. A 295 should fit a 10" and 11" wheel, but because they are 20" wheels, I can not confirm if you will have rubbing issues with the bottom of the suspension or not.

WhiteMale · 10-03-2022, 06:50 AM

I run a 285/35 on the rear 11" rim for winter tires, works perfectly fine.

Msquared · 10-03-2022, 07:29 AM

Assuming we are talking about the Continental ExtremeContact Sport (the DW is long out of production and the Sport is its replacement), and assuming you are talking about using your stock 1LE wheels, you could run the 295/30/20 on both ends and be within the rim width range recommended by the manufacturer for the tire. However, this isn't a "square" fitment because the wheels are still staggered. I'm sure Conti doubles the warranty on a true square fitment because you can rotate the tires front to rear, but you won't be able to do that. Therefore, I'd just use the stock 1LE sizes of 285/30/20 front and 305/30/20 rear.

dyingbreed · 10-11-2022, 04:39 PM

Quote:

Originally Posted by Msquared

Continental ExtremeContact Sport

correct

enzia35 · 10-14-2022, 07:18 PM

https://motoiq.com/how-to-properly-s...r-performance/

Better article on how to size tires.

10-02-2022, 07:18 PM	#1
dyingbreed Drives: Car Join Date: Sep 2021 Location: California Posts: 65	square tires on staggered wheels SS 1LE has these from factory: Front: 20x10 wheel 285/30 R20 Rear: 20x11 wheel 305/30 R20 I'm currently enjoying big discounts when I replace Continental Extreme Contact Sport. They have a 30,000 mile warranty and I get about 12k out of a set. (this is on another car with square wheel and tire set up). The warranty states they half it for staggered cars. Given 4 tires for SS 1LE are around $2,000 installed, I'm wondering how I can put square tires on and keep the full warranty. The obvious answer is to run 20x10 wheels on the rear but what if I keep the 20x11. Can I run a 285 tire on the 11 wide rear rim? Or how about 295 all round? Anyone thought of this or done it? I know the performance will not be quite as good, but: this is not a small amount of money to be saved (potentially $1,000s) if I don't like it I can always change back after a few burnouts AFAIK it will not be dangerous or cause damage, just not optimized (rear rim will be more vulnerable to curb rash) I live in dry warm weather year round Last edited by dyingbreed; 07-29-2023 at 01:55 AM. Reason: thought of sth

10-02-2022, 08:45 PM	#2
mariojas Drives: 2022 ZL1 M6 & 2023 Stinger GT AWD Join Date: Nov 2021 Location: Detroit Metro, MI Posts: 452	This is handy. https://m.roadkillcustoms.com/tire-w...y-wheel-width/ Shows the minimum, optimum, and maximum width of tire for a rim. But probably the most reliable information is from tire manufacturer - they should specify what rim width you should use. __________________ 2023 Kia Stinger GT AWD - as a family car... 2022 ZL1, M6 as daddy's ass mover Charger sold! Better to sell, than waiting to be stolen...

10-02-2022, 09:23 PM	#3
Aquarius Drives: Rapid Blue 2022 Camaro 1SS Join Date: Sep 2021 Location: Waterloo, Iowa Posts: 204	I run 295/35 R19's on all 4 corners on 10.5" wheels. Its doable, and I have the Continental Extreme Contact Sports. It is a tight fit for me, and I have @ 10mm of poke front and back. A 295 should fit a 10" and 11" wheel, but because they are 20" wheels, I can not confirm if you will have rubbing issues with the bottom of the suspension or not. __________________ 9/9/2021 - 1100 (date of deposit) 10/15/2021 - 2000 11/4/2021 - 3100 Status TPW 11/15 11/9/2021 - 3400 Status TPW 11/15 11/24/2021 - 3800 Status built 11/21/2021 12/2/2021 - 5000 Status 12/13/2021 - 6000 Status

10-03-2022, 07:29 AM	#5
Msquared Drives: Chevrolet SS 1LE Join Date: Oct 2019 Location: St. Charles, MO Posts: 1,446	Assuming we are talking about the Continental ExtremeContact Sport (the DW is long out of production and the Sport is its replacement), and assuming you are talking about using your stock 1LE wheels, you could run the 295/30/20 on both ends and be within the rim width range recommended by the manufacturer for the tire. However, this isn't a "square" fitment because the wheels are still staggered. I'm sure Conti doubles the warranty on a true square fitment because you can rotate the tires front to rear, but you won't be able to do that. Therefore, I'd just use the stock 1LE sizes of 285/30/20 front and 305/30/20 rear. __________________ Matt Miller 2020 SS 1LE

10-14-2022, 07:18 PM	#7
enzia35 Drives: '16 Garnet Red 1SS Join Date: Mar 2014 Location: College Station, TX Posts: 3,450	https://motoiq.com/how-to-properly-s...r-performance/ Better article on how to size tires. __________________ '16 Camaro 1SS '18 Miata GT Gone: '01 Camaro, '14 Camaro, '90 Miata

10-03-2022, 06:50 AM	#4
WhiteMale Drives: 23 ZL1 A10 Rapid Blue Join Date: Aug 2020 Location: MO Posts: 1,988	I run a 285/35 on the rear 11" rim for winter tires, works perfectly fine.

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