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SVT Shelby GT500
Rim widening to run 335/30/20s on an '09
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<blockquote data-quote="FHATTCATT" data-source="post: 15537073" data-attributes="member: 51587"><p>Seems like most people are saying the offset should be et56-62. From all the rims I see widened, it doesn't look like the barrel is affected at all- the added width is added to the back of the rim so the face of the rim and tire sit where they did prior to the rim being widened... is that correct? </p><p></p><p>I have 2013-2014 20x9.5" GT500 rims on my 2009 GT500.</p><p></p><p>I tried running 305/35/20 Micky T drag radials and took them off in less than 50 miles. The car hooked better, but lane changing at 80+mph was sketchy at best- softer sidewalls = less turning control and stability at higher speed. So I put on 305/35/20 Goodyears and now might as well have hockey pucks wrapped around the rims. No traction even in 5th and 6th gear. The car has a 2.9l Whipple, cams, full exhaust, tune, 3.73's, etc....</p><p></p><p>I have done tons of searching here on SVTP and elsewhere, but no one definitively says what the offset should be once the rim is widened to 11.5" or 11.75". I'm looking to run 335/30/20 Michelin Pilot SuperSports- sounds like people have good control with them and hook fairly well. </p><p></p><p><a href="https://www.svtperformance.com/forums/threads/335-30r20s-on-custom-widened-forgestar-f14s.1108795/" target="_blank">https://www.svtperformance.com/forums/threads/335-30r20s-on-custom-widened-forgestar-f14s.1108795/</a></p><p></p><p>Can anyone say with certainty how the rims should be modified? The above post shows 335/30s being run on an 11.75" rim, but doesn't say what the offset should be. When I send these to Weldcraft, I want to make sure they are done right. Not looking to run 315s or 325s. Since not running drag radials, I really want the widest possible street tire on it.</p><p></p><p>Thanks for any info.</p></blockquote><p></p>
[QUOTE="FHATTCATT, post: 15537073, member: 51587"] Seems like most people are saying the offset should be et56-62. From all the rims I see widened, it doesn't look like the barrel is affected at all- the added width is added to the back of the rim so the face of the rim and tire sit where they did prior to the rim being widened... is that correct? I have 2013-2014 20x9.5" GT500 rims on my 2009 GT500. I tried running 305/35/20 Micky T drag radials and took them off in less than 50 miles. The car hooked better, but lane changing at 80+mph was sketchy at best- softer sidewalls = less turning control and stability at higher speed. So I put on 305/35/20 Goodyears and now might as well have hockey pucks wrapped around the rims. No traction even in 5th and 6th gear. The car has a 2.9l Whipple, cams, full exhaust, tune, 3.73's, etc.... I have done tons of searching here on SVTP and elsewhere, but no one definitively says what the offset should be once the rim is widened to 11.5" or 11.75". I'm looking to run 335/30/20 Michelin Pilot SuperSports- sounds like people have good control with them and hook fairly well. [URL]https://www.svtperformance.com/forums/threads/335-30r20s-on-custom-widened-forgestar-f14s.1108795/[/URL] Can anyone say with certainty how the rims should be modified? The above post shows 335/30s being run on an 11.75" rim, but doesn't say what the offset should be. When I send these to Weldcraft, I want to make sure they are done right. Not looking to run 315s or 325s. Since not running drag radials, I really want the widest possible street tire on it. Thanks for any info. [/QUOTE]
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Rim widening to run 335/30/20s on an '09
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