05-30-2022, 07:06 PM | #1 |
Sixth Gen 1LE tire sizes
Will the use of 35 profile tires instead of 30 series cause a computer problem on a 2020 2SS 1LE? If so, is it an easy fix by GM?
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05-30-2022, 07:20 PM | #2 |
Drives: 2018 Camaro 2SS A8 Join Date: Jul 2017
Location: East Tennessee
Posts: 12,002
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No, it works even on a non-1LE SS, I have that exact configuration (285/35/20 front, 305/35/20 rear) by somewhat of a coincidence. Everything is fine with the ECM/TCM, and the setup looks awesome.
Clearancewise, however, you'll be cutting it very-very close: there is some slight rubbing in the front at full left lock, and unless gm changed main body wiring harness routing for 2020, you will need to relocate this harness in the driver side rear wheel well to avoid constant rubbing in the rear (see this thread: https://www.camaro6.com/forums/showthread.php?t=485975).
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2018 Camaro 2SS — G7E MX0 NPP F55 IO6
735 rwhp | 665 rwtq Magnuson TVS 2300 80mm pulley | Kooks 1 7/8" LT headers | JRE smooth idle terminator cam | LT4 FS & injectors | TSP forged pistons & rods JMS PowerMAX | DSX flex fuel kit | Roto-Fab CAI | Soler 95mm LT5 TB | 1LE wheels | 1LE brakes | BMR rear cradle lockout | JRE custom tune 1100 - 1/30/18 | 2000 - 1/31/18 3000 - 2/06/18 TPW 2/26/18 3400 - 2/19/18 | 3800 - 2/26/18 4300 - 2/27/18 | 4B00 - 3/01/18 4200 - 3/05/18 | 4800 - 3/14/18 5000 - 3/16/18 | 6000 - 3/19/18 |
06-01-2022, 09:08 AM | #3 | |
Quote:
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06-03-2022, 04:54 AM | #4 |
For what it is worth, I have heard that the Michelins tend to run a little smaller than some other 35 series tires, so the clearance is better with those than some other brands.
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06-06-2022, 12:53 PM | #5 |
Drives: Chevrolet SS 1LE Join Date: Oct 2019
Location: St. Charles, MO
Posts: 1,484
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GM went with 30s because a 305/35/20 is a huge/tall/heavy tire and it will hurt your performance. Unless you're going offroad and need extra ground clearance there is not a good reason to go with taller tires than stock. If you're really that concerned about having more sidewall, then you should step down to 19" wheels and run 35-series tires on those. You'll keep a similar overall diameter but gain sidewall height.
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Matt Miller
2020 SS 1LE |
06-06-2022, 06:36 PM | #6 | |
Drives: 2018 Camaro 2SS A8 Join Date: Jul 2017
Location: East Tennessee
Posts: 12,002
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Quote:
That said, I'll most likely revert to the 30 series when these wear out, wheel well clearance is too narrow for my long term taste.
__________________
2018 Camaro 2SS — G7E MX0 NPP F55 IO6
735 rwhp | 665 rwtq Magnuson TVS 2300 80mm pulley | Kooks 1 7/8" LT headers | JRE smooth idle terminator cam | LT4 FS & injectors | TSP forged pistons & rods JMS PowerMAX | DSX flex fuel kit | Roto-Fab CAI | Soler 95mm LT5 TB | 1LE wheels | 1LE brakes | BMR rear cradle lockout | JRE custom tune 1100 - 1/30/18 | 2000 - 1/31/18 3000 - 2/06/18 TPW 2/26/18 3400 - 2/19/18 | 3800 - 2/26/18 4300 - 2/27/18 | 4B00 - 3/01/18 4200 - 3/05/18 | 4800 - 3/14/18 5000 - 3/16/18 | 6000 - 3/19/18 |
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06-06-2022, 09:48 PM | #7 |
Drives: Chevrolet SS 1LE Join Date: Oct 2019
Location: St. Charles, MO
Posts: 1,484
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That extra mass is also further out on a longer radius due to the bigger diameter, so it's a bigger penalty than most would think. But still, that's the least of the problems. The raised roll centers and CG are bigger issues, the taller tire makes for a longer effective gear ratio, and the clearance is questionable, especially in back.
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Matt Miller
2020 SS 1LE |
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