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Cobra Forums
2013-14 Shelby GT500
Tire size With Current HRE Wheels
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<blockquote data-quote="_Satch_" data-source="post: 16368270" data-attributes="member: 144860"><p>Wheel offset numbers are based on wheel width center plane to the hub mounting face. The factory numbers are based off a 9.5 inch wide wheel. So if you add 1 inch to the rear wheel width, but not change the offset number, you've effectively added 1/2 inch to the inside and 1/2 to the outside of a factory wheel. I can't see 1/2 inch on the inside being much, if any problem, but 1/2 outward towards the fender lip may get tight, especially if you are lowered.</p><p></p><p> I am currently running a 20 X 10 front wheel with a 38 offset and a 20 X 11 rear wheel with a 54 offset, and everything clears, but I did do the bump stop relocation brackets and I also cut out the body mounting brackets on the rear. The 54 offset is moving the outer wheel face about .395 towards the fender, while moving the inner wheel face 1.104 inward towards the shock. My car is also dropped 7/8's with the Ford L Springs.</p><p></p><p>This is a good explanation of wheel offset. <a href="https://www.tirerack.com/wheels/tech/techpage.jsp?gclid=Cj0KCQiAs67yBRC7ARIsAF49CdW0_39ZhSSAdbJHscJZWcgAmW5owUpzP3rG3tU0UGil00vblbMwEXEaAuiqEALw_wcB&techid=101&ef_id=Cj0KCQiAs67yBRC7ARIsAF49CdW0_39ZhSSAdbJHscJZWcgAmW5owUpzP3rG3tU0UGil00vblbMwEXEaAuiqEALw_wcB:G:s&s_kwcid=AL!3756!3!258372089207!b!!g!!+wheel%20+offset%20+explained&gclsrc=aw.ds" target="_blank">https://www.tirerack.com/wheels/tech/techpage.jsp?gclid=Cj0KCQiAs67yBRC7ARIsAF49CdW0_39ZhSSAdbJHscJZWcgAmW5owUpzP3rG3tU0UGil00vblbMwEXEaAuiqEALw_wcB&techid=101&ef_id=Cj0KCQiAs67yBRC7ARIsAF49CdW0_39ZhSSAdbJHscJZWcgAmW5owUpzP3rG3tU0UGil00vblbMwEXEaAuiqEALw_wcB:G:s&s_kwcid=AL!3756!3!258372089207!b!!g!!+wheel +offset +explained&gclsrc=aw.ds</a></p><p></p><p>Hope this helps,</p><p>-Satch</p></blockquote><p></p>
[QUOTE="_Satch_, post: 16368270, member: 144860"] Wheel offset numbers are based on wheel width center plane to the hub mounting face. The factory numbers are based off a 9.5 inch wide wheel. So if you add 1 inch to the rear wheel width, but not change the offset number, you've effectively added 1/2 inch to the inside and 1/2 to the outside of a factory wheel. I can't see 1/2 inch on the inside being much, if any problem, but 1/2 outward towards the fender lip may get tight, especially if you are lowered. I am currently running a 20 X 10 front wheel with a 38 offset and a 20 X 11 rear wheel with a 54 offset, and everything clears, but I did do the bump stop relocation brackets and I also cut out the body mounting brackets on the rear. The 54 offset is moving the outer wheel face about .395 towards the fender, while moving the inner wheel face 1.104 inward towards the shock. My car is also dropped 7/8's with the Ford L Springs. This is a good explanation of wheel offset. [URL]https://www.tirerack.com/wheels/tech/techpage.jsp?gclid=Cj0KCQiAs67yBRC7ARIsAF49CdW0_39ZhSSAdbJHscJZWcgAmW5owUpzP3rG3tU0UGil00vblbMwEXEaAuiqEALw_wcB&techid=101&ef_id=Cj0KCQiAs67yBRC7ARIsAF49CdW0_39ZhSSAdbJHscJZWcgAmW5owUpzP3rG3tU0UGil00vblbMwEXEaAuiqEALw_wcB:G:s&s_kwcid=AL!3756!3!258372089207!b!!g!!+wheel%20+offset%20+explained&gclsrc=aw.ds[/URL] Hope this helps, -Satch [/QUOTE]
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Tire size With Current HRE Wheels
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