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Old 07-28-2019, 04:37 PM   #15
RJT Impala
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Originally Posted by Rock-It Man View Post
Check your math.
But--as I compute--it's still within 5%.
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Old 07-28-2019, 04:55 PM   #16
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Originally Posted by Rock-It Man View Post
Check your math.
275/40X20 radius = 14.33
285/40X20 radius = 14.49
14.49/14.33=1.0109

What am I missing?
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Old 07-28-2019, 05:21 PM   #17
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Originally Posted by camaro528 View Post
Just using my stock 20,s rim's , I'm just goin 1 size up on the tires from stock sizing.....so I'm hearing 255/40/20 front and 285/35/20 rear.....or can the rear be 285/40/20???
I did 295 40 20s on stock rims. They filled the wheel well nicely with zero issues.
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Old 07-29-2019, 01:57 PM   #18
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Originally Posted by Modernmusclecar View Post
I did 295 40 20s on stock rims. They filled the wheel well nicely with zero issues.
What's your front tire setup?? Your speedometer wasnt off / or height of your ride off??
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Old 07-29-2019, 03:31 PM   #19
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Originally Posted by camaro528 View Post
I'll just stick with 255/40/20 front and
285 /35/20rear.......or probably just go back to to stock settings 245 45 20 front and 275 40 20 rear with the stock 20s rim's the car came with
Good idea. Using Zeros as an example, because they have all the sizes you are considering:

255/40/20 dia. 28"
275/40/20 dia. 28.7"
285/35/20 dia. 27.8
285/40/20 dia. 29"

If your fronts are the 255/40, the closest match is the 285/35.

The 285/40 is 3.6% bigger than the 255/40. While this size difference may not activate traction control immediately, any size difference does lower the threshold for activation when you drive aggressively.

BTW, 275/40 is the original rear size and matches the diameter of the original front 245/45 exactly.
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Old 07-29-2019, 04:12 PM   #20
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Originally Posted by CamaroFred View Post
275/40X20 radius = 14.33
285/40X20 radius = 14.49
14.49/14.33=1.0109

What am I missing?
your math is correct.

285mm x .4 = 114
275mm x .4 = 110

114mm x 2 = 228
110mm x 2 = 220

20 inch rim x 25.4 = 508mm




508mm wheel + 228mm sidewalls = 736mm diameter

508mm wheel + 220mm sidewalls = 728mm diameter

728mm dia / 736mm dia = .9891 ratio or 1.09% difference
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Last edited by pnwdan; 07-29-2019 at 04:58 PM.
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Old 07-30-2019, 12:17 AM   #21
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Originally Posted by camaro528 View Post
What's your front tire setup?? Your speedometer wasnt off / or height of your ride off??
255 45 20 front...295 40 rear. No issues at all. the car rode a bit better because of the added sidewall. The ires fill in the wheel wheel nicely. Here they are..

https://www.tires-easy.ca/255-45-20/...ecode/28175013
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Old 07-31-2019, 07:37 PM   #22
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Last question, using the setup 255/45/20 front and 285/40/20 on stock 20's ok too use without any issues (ride height/speedometer issues/etc..)?? Idk if I'm reading it right but on tiresize.com I see the specs on this setup and seems ok, but please correct if I'm wrong please lol.... i just want a larger side wall
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Old 07-31-2019, 11:19 PM   #23
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Originally Posted by camaro528 View Post
Last question, using the setup 255/45/20 front and 285/40/20 on stock 20's ok too use without any issues (ride height/speedometer issues/etc..)?? Idk if I'm reading it right but on tiresize.com I see the specs on this setup and seems ok, but please correct if I'm wrong please lol.... i just want a larger side wall
Perfect fit...i had 295 40s on the rear. The ride height is fine ...you have no worries.
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Old 09-15-2019, 09:50 PM   #24
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So tommorow im putting on 255 45 20 on the front and 285 40 20 on the rear on the stock 20's....would this tire setup be ok? The comparison on the charts below show the differences, just need your guys opinions/comments... .....thanks!!
(Reason why I chose 285 40 20 , is because I didnt want to run a 285 "35" 20 , just wanted a thicker sidewall....really not a fan of super low profile tires
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Old 09-18-2019, 04:15 PM   #25
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I am running stock up front and 285/40R20 in the rear. You will be much happier with the 285/40 than you would be with the 285/35.... IMO
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Old 09-18-2019, 09:16 PM   #26
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I am running stock up front and 285/40R20 in the rear. You will be much happier with the 285/40 than you would be with the 285/35.... IMO
....But doesn’t the 1LE come with 285/35-20 on a 10” rim up front? Looks (and performs) great.
(I’d eventually like to change to 10” wheels all around so I’m just trying to follow this.)
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Old 09-19-2019, 12:58 PM   #27
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....But doesn’t the 1LE come with 285/35-20 on a 10” rim up front? Looks (and performs) great.
(I’d eventually like to change to 10” wheels all around so I’m just trying to follow this.)
1LE has a square setup meaning it has the same size on all 4 corners. helps with under steer.
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