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Having different tire sizes a bad idea?

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Old Feb 15, 2022 | 02:35 PM
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Default Having different tire sizes a bad idea?

I have a bit of fender gap im not fond of and I was thinking of lowering the stock bolts just a little and maybe going a size up in profile in the back or both. Then lowering more. As of now with the tires the way they are the spedo is correct because I went up in wheel size and down on tire. Will going up on the back throw anything drastic off aside from the speedo? Any electronics affected?

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Old Feb 15, 2022 | 02:43 PM
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Whatever you find that's one good looking car. I just went up one size and one size wider resulting the same tire height. You already know all this though. I also tried to move the bolts that control ride height. They wanted to strip so I left it alone. I would like a lower ride height though. I think a shop may have to get involved here on my behalf.
Did you have any difficulty with your bolts?
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Old Feb 15, 2022 | 02:44 PM
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IMO you need to keep the front/rear bias the same as stock to not have incorrect data for the ABS/TC.
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Old Feb 15, 2022 | 02:59 PM
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Originally Posted by The Former
Whatever you find that's one good looking car. I just went up one size and one size wider resulting the same tire height. You already know all this though. I also tried to move the bolts that control ride height. They wanted to strip so I left it alone. I would like a lower ride height though. I think a shop may have to get involved here on my behalf.
Did you have any difficulty with your bolts?
I had not tried it yet. I took it to a friend's to do it and he thinks it would be way too low. So I got hesitant. I was just tossing ideas around to possibly get rid of some of the gap. Lowering/bigger tire etc

Originally Posted by lrobe22
IMO you need to keep the front/rear bias the same as stock to not have incorrect data for the ABS/TC.
Thank you for the response. I was thinking it might screw something up electronically. By what your saying it would be best just to go up on profile so they are all the same even though the spedo would be off..
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Old Feb 15, 2022 | 03:00 PM
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Current tire size is
Front Tire Size: 265/30/19

Rear Tire Size: 295/30/20

Would a 35 series be a huge jump?
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Old Feb 15, 2022 | 03:04 PM
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IIRC, stock tires are 25.5” front and 26.5” rear diameter. If you want a 27.5” rear tire, you will need a ~26.45” front tire (I would think that will rub) to retain the stock bias. Sorry, my technique is to look at actual measured diameter and width in inches; there can often be a variance between what the sidewall says versus the tape measure.
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Old Feb 15, 2022 | 03:59 PM
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Originally Posted by Geardownson
Current tire size is
Front Tire Size: 265/30/19

Rear Tire Size: 295/30/20

Would a 35 series be a huge jump?
No. That's what I found anyway. When you move one tire size up or down it really makes zero diff.

I went from 275/40/18 to a 295/35/18 and the tire height was almost exactly the same. However the contact patch with the ground is almost 2 inches wider.
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Old Feb 15, 2022 | 05:18 PM
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Originally Posted by lrobe22
IIRC, stock tires are 25.5” front and 26.5” rear diameter. If you want a 27.5” rear tire, you will need a ~26.45” front tire (I would think that will rub) to retain the stock bias. Sorry, my technique is to look at actual measured diameter and width in inches; there can often be a variance between what the sidewall says versus the tape measure.
From tire rack this is the info I found for what I have vs going to 35.

35 series 28.1in vs 30 series 27in rear

Front 35 series 27.3 vs 30 series 26.3

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Old Feb 15, 2022 | 07:30 PM
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Originally Posted by lrobe22
IMO you need to keep the front/rear bias the same as stock to not have incorrect data for the ABS/TC.
That is incorrect. A C5's AH/TC doesn't care what tire size you run, just don't fit a taller front tire than the rears.
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Old Feb 15, 2022 | 08:19 PM
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I'm not quite sure what kind of look you are going for because IMO that fender gap is not that bad.




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Old Feb 15, 2022 | 08:29 PM
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Originally Posted by Mr. Black
I'm not quite sure what kind of look you are going for because IMO that fender gap is not that bad.
I thought the same thing.
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Old Feb 16, 2022 | 09:05 AM
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Originally Posted by Mr. Black
I'm not quite sure what kind of look you are going for because IMO that fender gap is not that bad.
Originally Posted by USAZR1
I thought the same thing.
Right now I can fit about 3 fingers between the fender and the tire. I like it at about 1 or 1 and a half..
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