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Old 06-01-2021, 07:20 AM   #15
Msquared

 
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Quote:
Originally Posted by Zapote21 View Post
I went with 5th gen ZL1 wheels, and standard 1LE tire sizes (275/30 and 305/30)

Fits perfectly. On that note for future readers, I have MRC on my 2SS
Standard 1LE front size is 285/30, so you're running an even bigger split in diameter than stock and have no problems. I autocross on those sizes in 19" wheel diameters in my 1LE and it also doesn't cause problems. The TCS/ABS has a wide enough tolerance range to accommodate this split.
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Old 06-01-2021, 10:24 AM   #16
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Quote:
Originally Posted by Msquared View Post
Standard 1LE front size is 285/30, so you're running an even bigger split in diameter than stock and have no problems. I autocross on those sizes in 19" wheel diameters in my 1LE and it also doesn't cause problems. The TCS/ABS has a wide enough tolerance range to accommodate this split.
Ooops you are correct. 285/30. Fat fingers. Thats is what i meant

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Old 06-02-2021, 01:57 PM   #17
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Quote:
Originally Posted by Zapote21 View Post
I went with 5th gen ZL1 wheels, and standard 1LE tire sizes (275/30 and 305/30)

Fits perfectly. On that note for future readers, I have MRC on my 2SS
Are the 5th gen ZL1 rims the same size as the 6th gen SS LE ?
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Old 09-17-2021, 11:13 PM   #18
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I have the tyre calculator open
305/30/20 and 285/30/20 are 1.8% different on diameter (Stock setup)
315/30/20 and 275/35/20 are 0.7% difference
305/30/20 and 275/35/20 are 1.5% difference
315/30/20 and 285/30/20 are 2.6% difference

You would be better running a 315 rear and 275 front to get the closest rolling diameter
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Old 09-20-2021, 09:31 AM   #19
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Quote:
Originally Posted by STALKER_174 View Post
I have the tyre calculator open
305/30/20 and 285/30/20 are 1.8% different on diameter (Stock setup)
315/30/20 and 275/35/20 are 0.7% difference
305/30/20 and 275/35/20 are 1.5% difference
315/30/20 and 285/30/20 are 2.6% difference

You would be better running a 315 rear and 275 front to get the closest rolling diameter
"Closest rolling diameter" is not important for anything, though. Any of the combos you listed will be close enough to not cause any problems, and the rear speedometer calibration differences will be extremely small. For actual handling and looks, though, it would be preferable to have the shorter and wider front tire.

Since the stock 1LE tire sizes (205/30 and 285/30) are a well known quantity, it seems like a no-brainer to use those if you're willing to use 11" and 10" wheels. Another option would be a square setup with 10.5" wheels and 305/30/20 tires at all four corners. If you used wheels with identical offset and used spacers up front, you could rotate them front to rear as well. There are several threads on that setup.
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Old 10-28-2021, 07:59 AM   #20
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After much research I pulled the trigger on 315/30 combo for the rear , did the relocate of the harness in the drivers rear wheel well and have no rubbing issues what’s so ever. Tire fits perfectly and couldn’t be happier. I stuck with the 275/35 up front and this is a 1SS and damn it rides great and looks awesome
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Old 10-28-2021, 12:41 PM   #21
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Originally Posted by WillyZ83 View Post
After much research I pulled the trigger on 315/30 combo for the rear , did the relocate of the harness in the drivers rear wheel well and have no rubbing issues what’s so ever. Tire fits perfectly and couldn’t be happier. I stuck with the 275/35 up front and this is a 1SS and damn it rides great and looks awesome
Glad to hear it works for you, too
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Old 10-28-2021, 04:17 PM   #22
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I went with the 275/35 on the front but had to get 305 rears this time instead of the 315s I wanted. Damn convict country not having fat tyres in stock
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Old 10-28-2021, 11:02 PM   #23
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Quote:
Originally Posted by Msquared View Post
A 275/35/20 is taller than a 315/30/20. Not sure why you'd want taller tires up front. Why wouldn't you just go with SS 1LE tire sizes: 285/30/20 front and 305/30/20 rear? You can run 275s on front 10" wheels, but the height is either going to be shorter or taller (30 or 35) than you really want. There's no reason not to use 285s.

You're correct that the 275/35/20 is taller than the 315/30/20. However as Stalker points out later in his reply, only by 0.7% and/or 0.1 inches. That's the closest match up I think you could probably get when changing to a wider, staggered setup.


Quote:
Originally Posted by STALKER_174 View Post
I have the tyre calculator open
305/30/20 and 285/30/20 are 1.8% different on diameter (Stock setup)
315/30/20 and 275/35/20 are 0.7% difference
305/30/20 and 275/35/20 are 1.5% difference
315/30/20 and 285/30/20 are 2.6% difference

You would be better running a 315 rear and 275 front to get the closest rolling diameter

True, closest rolling diameter wouldn't affect much, since we know the 1LE setup has a larger difference of 1.8%. But it does match up the look more closely in diameter, if that matters to you visually.


Quote:
Originally Posted by Msquared View Post
"Closest rolling diameter" is not important for anything, though. Any of the combos you listed will be close enough to not cause any problems, and the rear speedometer calibration differences will be extremely small. For actual handling and looks, though, it would be preferable to have the shorter and wider front tire.

Since the stock 1LE tire sizes (205/30 and 285/30) are a well known quantity, it seems like a no-brainer to use those if you're willing to use 11" and 10" wheels. Another option would be a square setup with 10.5" wheels and 305/30/20 tires at all four corners. If you used wheels with identical offset and used spacers up front, you could rotate them front to rear as well. There are several threads on that setup.

I don't know if most people would want a 305/30/20 on the front, unless you were going for all out poke out on those fatties! And you'd have to run at least a 325/25/20 or wider on the back, just for S & G!
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Old 10-29-2021, 09:34 AM   #24
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Quote:
Originally Posted by flyinmach1 View Post
You're correct that the 275/35/20 is taller than the 315/30/20. However as Stalker points out later in his reply, only by 0.7% and/or 0.1 inches. That's the closest match up I think you could probably get when changing to a wider, staggered setup.
It's 0.2" taller (27.6"), but that's still not a big difference. However, my concern is less about appearance and more about function. A tall front tire is not helpful for grip, steering response, roll centers, or weight transfer. There's no value in using that tire size. OTOH, the stock 1LE front tire (285/30/20) is 26.8", so only 0.6" shorter than a rear 315/30/20, and yet it's going to perform better and probably even look a little better. It will absolutely work with the car's ABS and TCs. There's no downside at all.

Quote:
I don't know if most people would want a 305/30/20 on the front, unless you were going for all out poke out on those fatties! And you'd have to run at least a 325/25/20 or wider on the back, just for S & G!
With the proper offset on a 10.5" wheel, a 305 won't poke out of a stock SS fender.
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Old 10-29-2021, 12:49 PM   #25
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Originally Posted by Msquared View Post
With the proper offset on a 10.5" wheel, a 305 won't poke out of a stock SS fender.

I have been trying to find this exact offset. Do you or anyone else happen to know what that ET is?
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Old 10-29-2021, 01:27 PM   #26
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Originally Posted by Aquarius View Post
I have been trying to find this exact offset. Do you or anyone else happen to know what that ET is?
I don't, but there some threads on this forum on this very topic. If you want a truly square set, you'll be getting wheels with something like et35, and then using spacers for the front (can't recall the thickness) to subtract some of that offset. That allows full rotation. As a reference, a 1LE front wheel that is 20x10 with 285/30/20 tire has 2mm offset, but I think a 10.5 with 305 would probably need a bit less net offset - maybe 17mm?
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