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SVT Shelby GT500
Proper Wheel/ Tire sizing basics
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<blockquote data-quote="Catmonkey" data-source="post: 15478495" data-attributes="member: 124025"><p>I think the biggest range of opinions center around fitting a given tire size on a given rim width. All tire manufacturers recommend a range of wheel width for a given tire size. I can guaranty that you will not find a manufacturer that recommends a tire larger than a 285 for placement on a 9.5" wide wheel. So if you want to run a larger tire, you have to look at wider wheels. The important aspect of running wider wheels for wider tires is to familiarize yourself with the concept of wheel offset. Unless your wheel places the tire in the proper zones of the wheel well, you may not be able to run as wide a tire as you might like because it places the sidewall too close to the inner fender or the thread under the outer fender lip. Tire Rack has a technical section that can explain both of these concepts better than I can, so you might check that out.</p><p></p><p>Bear in mind that the wider the tire, or a mismatched offset with a narrower tire, the more likely you will encounter some amount of rubbing unless you drive below your car's potential. I've got a thread in the DIY section of this forum <a href="http://www.svtperformance.com/forums/threads/making-clearance-for-wide-tires.916691/" target="_blank">http://www.svtperformance.com/forums/threads/making-clearance-for-wide-tires.916691 on what it took for me to fit 315s. I've since gone to 325/30-20s. </a></p><p><a href="http://www.svtperformance.com/forums/threads/making-clearance-for-wide-tires.916691/" target="_blank"></a></p><p><a href="http://www.svtperformance.com/forums/threads/making-clearance-for-wide-tires.916691/" target="_blank">The other thing you want to focus on is tire compound. Generally the lower the UTQG number, the sticker the tire, but the shorter the wear life. There are also a number of tire sites that can give you general fitment guidelines with a given tire size and wheel offset. Take some measurements of your existing wheel/tire combination as to clearances and see what works or how close you want to be with the fenders.</a></p></blockquote><p></p>
[QUOTE="Catmonkey, post: 15478495, member: 124025"] I think the biggest range of opinions center around fitting a given tire size on a given rim width. All tire manufacturers recommend a range of wheel width for a given tire size. I can guaranty that you will not find a manufacturer that recommends a tire larger than a 285 for placement on a 9.5" wide wheel. So if you want to run a larger tire, you have to look at wider wheels. The important aspect of running wider wheels for wider tires is to familiarize yourself with the concept of wheel offset. Unless your wheel places the tire in the proper zones of the wheel well, you may not be able to run as wide a tire as you might like because it places the sidewall too close to the inner fender or the thread under the outer fender lip. Tire Rack has a technical section that can explain both of these concepts better than I can, so you might check that out. Bear in mind that the wider the tire, or a mismatched offset with a narrower tire, the more likely you will encounter some amount of rubbing unless you drive below your car's potential. I've got a thread in the DIY section of this forum [URL='http://www.svtperformance.com/forums/threads/making-clearance-for-wide-tires.916691/']http://www.svtperformance.com/forums/threads/making-clearance-for-wide-tires.916691 on what it took for me to fit 315s. I've since gone to 325/30-20s. The other thing you want to focus on is tire compound. Generally the lower the UTQG number, the sticker the tire, but the shorter the wear life. There are also a number of tire sites that can give you general fitment guidelines with a given tire size and wheel offset. Take some measurements of your existing wheel/tire combination as to clearances and see what works or how close you want to be with the fenders.[/URL] [/QUOTE]
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Proper Wheel/ Tire sizing basics
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