Widest tire size? - IMBOC
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post #1 of 9 (permalink) Old 08-19-2019, 11:54 AM Thread Starter
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Question Widest tire size?

What is the widest tire size that you guys have run on the stock rims without issues? I need to replace my 11 1/2 year old tires that have roughly 6,300 miles on them.
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post #2 of 9 (permalink) Old 08-19-2019, 12:07 PM
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The widest "recommended" size for the stock wheel is 255/45/18. I'm sure you could go wider, but law of diminishing returns applies.
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post #3 of 9 (permalink) Old 08-19-2019, 03:51 PM Thread Starter
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I was just curious, because I had 275/40/17's mounted on the rear of the '86 I just sold(see Avatar). It had 17X8.5 93 Cobra replica rims. They looked good with a little bit of sidewall bulge and seemed to wear good.

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post #4 of 9 (permalink) Old 08-19-2019, 04:21 PM
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Generally speaking you don't want tires 2" or wider more than the rim width, 255=10.2" When you go wider you won't likely get a full contact patch with recommended tire pressure. I had 275-40-18's on 9.5" wheels and that was a perfect match up. Check with Tire Rack and you will see the rim width range under specs. for each type of tire.


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post #5 of 9 (permalink) Old 08-19-2019, 04:42 PM

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Officially, bullit4404 is correct.

But since your 08 only has 6,300 miles on it, it definitely is not a daily driver. If you want to go wider with the 275 tires for looks, go for it. Just understand that the tires are actually too wide for those rims so you will not get full, solid contact with the pavement. But, if you are just going for looks and you don't drive the car a lot, sure, the tires can be put on the rims.

Just understand the limitations.
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post #6 of 9 (permalink) Old 08-20-2019, 12:11 PM Thread Starter
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Thanks for the input, guys.
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post #7 of 9 (permalink) Old 08-27-2019, 04:36 PM
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There's another real consideration. If the wheel width is too narrow for the tire, the tire may just pop off the rim on a hard turn.

I've seen it happen.


Stay with the tire manufacturer's recommendations!!
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post #8 of 9 (permalink) Old 09-07-2019, 11:12 AM
 
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+1 on the 255/45. I run these daily, with no traction complaints on a stock(ish) powered car. You can feel a touch of sidewall roll since it's at the max recommended up-size. I imagine you'd experience significantly more roll if you were to up-size even farther than this.


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post #9 of 9 (permalink) Old 09-07-2019, 01:32 PM

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I had 255/40 Nitto 555 for many years. Was fine, even tracked it that way. I really liked the look.

Ideally you want to check the tire specs online from the manufacturer, and see what they suggest. If you do any open tracking, it's recommended to stay on the conservative side.
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