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Old 02-10-2008, 09:49 PM
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Maximum Tire Width

Every now and then I think about lifting my Silverado. It's not anything that I'm really concerned about so it usually just ends up being an idea that goes by the wayside after an hour or two and I never really think very seriously about it.

One of the reasons that I have never given it much more thought is because of the wheels. It has the nice forged aluminum wheels they put on 99-up 3/4 tons.


The biggest tire I'd ever go with is a 33" but most of those are 11.5-12.5" wide. The factory GM wheel is only 6.5" wide. How wide of a tire is too wide for this narrow of a rim? I'd honestly rather keep the truck stock if it meant swapping out the wheels. I think they might be best looking wheels ever installed on a pickup from the factory and I'd like to keep them.

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Old 02-11-2008, 06:25 AM
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What I have done on my truck is to install the accessory air bags and I run the 31's..gives me about 2" of lift and a nice stance..And the truck is not too high to be useful..

I have the stock Ford alloy rims on mine..

Sam
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Old 02-11-2008, 04:29 PM
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2-3" would probably be plenty high enough. The current tires are a little over 30" tall and 9.6" wide. I found a BF Goodrich tire that measures 33.1" x ~10.25". Would a 10.25" tire be too wide for a 6.5" wheel?

OMT, is your truck a full size?
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Old 02-11-2008, 05:46 PM
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My truck is a full size F150 and the tires are 31x10.50R15 that I have on it..works for me..I think I have a picture in my photo gallery..Gettin old I ferget stuff..

Yup just a pic of the back of the truck..I checked..

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Old 02-12-2008, 09:01 AM
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The widest tire for your application is a 265/75R16. Reason being is the next size up, a 285/75R16 will actually mushroom out. In other words, even though the section width is roughly 11 inches, the contact patch will be considerably less. BFGoodrich has actually madated that all of their dealers should only install a 285/75R16 on an 8" rim, even though the BFGoodrich All-Terrain T/A KO BAZ has strips of spiral-wound nylon in the shoulder area of the tire to strengthen the tire in unapproved applications. Goodyear has also strengthened the same area in theor Goodyear Wrangler SilentArmor Pro Grade tires by adding two layers of Kevlar over the steel belts, as well as two more layers of Kevlar along the shoulder of the tire.

Another issue is the sudden popularity of load range "E" applications within the 285/75R16 size group. The nice thing about it is the added air volume within the tire for better cooling characteristics when towing. The downside is on a 6.5" aluminum rim, the added volume will in time cause the rim to crack. Especually cast aluminum rim. So the benefits would only be seen in an 8" application, which lowers the chance of a rim failure.

So the upside to a larger tire with the rim that you posted up is merely looks. The downside is irregular wear characteristics, possible torque-cracking ( this application is notorious for having the bead area of the assembly turn before the outer tread area, causing cracks to develope along the shoulder), and possible unstable wet traction issues because only a portion of the tread is actually in contact with the road.

If you are lifting your truck, I'd suggest a 16x8. With a 285/75R16, you shouldn't have fitment issues.
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Old 02-12-2008, 06:44 PM
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That's what I was wondering. Like I said before, I like the factory wheels and I don't want to lift it enough that I want to get rid of those wheels.

The factory tires are 245/75-R16 and I've thought before about moving up to 265s when it's time for new tires. I think I'll just go that route.
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Old 02-14-2008, 10:10 AM
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Go to the tire company's web site of the tires you want to get and look up the specified rim sizes.
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