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Old 03-03-2015, 11:30 PM   #1
JB12ZL1
 
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safe tire combo

Anybody running 275/35/20 f 315/35/20 r on a ZL1? Will this combo set off stabilittrac etc? I'm looking at the nitto invo, motivo or vredestein ultrac vorti If this combo won't work.
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Old 03-04-2015, 06:20 AM   #2
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I am running 315's in the back and 295's in the front. No problems. Not sure what that much of a difference would do.
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Old 03-04-2015, 09:23 AM   #3
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Yes you will have issues because those are two different diameter tires. Dont ask me why but a 275/35/20 is over and inch smaller than a 315/35/20. Have to go with a 275/40/20 and you will be fine. Nitto invos offer those sizes thats what im running on my SS.
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Old 03-04-2015, 01:22 PM   #4
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Not a ZL1 but I have 275/40/20 f and 315/35/20 r Vred's on my SS. Aspect ratio on the rear at 5 less than front is the key to not having traction control/stabiltrac issues. My fronts and rears have the same diameter.
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Old 03-04-2015, 03:51 PM   #5
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Quote:
Originally Posted by PAUL SS View Post
Not a ZL1 but I have 275/40/20 f and 315/35/20 r Vred's on my SS. Aspect ratio on the rear at 5 less than front is the key to not having traction control/stabiltrac issues. My fronts and rears have the same diameter.
Those are the sizes I've seen recommended and will be what I'm getting soon.
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Old 03-04-2015, 06:20 PM   #6
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Im assuming that the 275/35/20 is a typo.

Most common setup, 275/40/20 on fronts. Backs i also have 315/35/20s on the rear. I went with the Vredestein's Ultrac Sessanta tires. They are Awesome!!

They hold the road like glue!!!
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Old 03-04-2015, 07:40 PM   #7
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^^275/40 is proper size.

I run it, it is a great combo eats up the corners and very comfortable highway cruise no complaints.
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Old 03-04-2015, 11:14 PM   #8
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Awesome thanks....I ended up getting mickey thompson street comp in 305/35/20 diameter different in stock is .56 if I do 275/35/20 it will be .83 difference should not cause any issues you think?

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Old 03-05-2015, 03:13 PM   #9
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After some research I will save 1.5lbs in tire weight using the mickey thompsons..not much but still a weight reduction lol.
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Old 03-05-2015, 08:19 PM   #10
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Not sure a 35 profile in the front will work in this situation, your more then welcome to try and go against the preechers on here.

I did see one guy do it he said no lights changing from a 40 to a 35.
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Old 03-06-2015, 07:00 PM   #11
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My car stock in front is 285/35/20 I like the feel of 35 profile on my ZL1...plus saving some weight helps although minimal.
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Old 03-06-2015, 08:46 PM   #12
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285/35R20 is the same overall diameter as a 275/40R20. Give or take a tenth of an inch depending on what tire you go with. The 35 or 40 is the percentage taken from the width of your tire to calculate your sidewall.
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Old 03-07-2015, 01:47 PM   #13
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Thanks cody...here is a stupid question which tires front or rear control speedometer or both.
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Old 03-07-2015, 02:12 PM   #14
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On most vehicles its the rear including the camaro because when doing a standing still burnout my speedo says im going 55 mph lol. The only reason going with different size tires front/rear would be an issue would be your ABS sensing one set of tires traveling faster than the other and it may cause random lights to come on your dash. I dont believe it will hurt anything mechanically though
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Old 03-08-2015, 05:39 PM   #15
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Thanks again cody if I put 275/40/20 on the front it will have a larger diameter than 305 rears according to tire calculate I used.
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