doublegrabber Posted April 16, 2011 Report Share Posted April 16, 2011 Hello, can anybody confirm if stock gt500 tires will fit on stock Shelby GT rims Shelby tire size is 235-50-18 GT500 tires are 255-45-18 front, 285-40-18 back Thanks in advance for any help Greg Link to comment Share on other sites More sharing options...
clark17357 Posted April 16, 2011 Report Share Posted April 16, 2011 Nope. Too narrow as I recall someone telling me when I looked into it a couple years ago. When I went to those size tires, I went to GT500 wheels at the same time (and then to the KR wheels on there now). Jim Link to comment Share on other sites More sharing options...
doublegrabber Posted April 16, 2011 Author Report Share Posted April 16, 2011 Thanks for the response Link to comment Share on other sites More sharing options...
socalwrench Posted April 16, 2011 Report Share Posted April 16, 2011 The 255/45 tires will fit on the stock Bullitt wheels. The 285/35 is too wide though. Link to comment Share on other sites More sharing options...
doublegrabber Posted April 16, 2011 Author Report Share Posted April 16, 2011 The 255/45 tires will fit on the stock Bullitt wheels. The 285/35 is too wide though. so if I want to do this front rims should be ok but the rear wheels need to be wider how much should I widen the rear wheels to fit the gt500 tires Link to comment Share on other sites More sharing options...
socalwrench Posted April 16, 2011 Report Share Posted April 16, 2011 The FR Bullitts, or Shelby 5 spoke, wheels = 18"x8.5". The GT500, or SVT, wheels = 18"x9.5". 255mm is the widest for the 8.5" wheel. To run the 285mm tire, you need the 9.5" wheel. Link to comment Share on other sites More sharing options...
doublegrabber Posted April 16, 2011 Author Report Share Posted April 16, 2011 The FR Bullitts, or Shelby 5 spoke, wheels = 18"x8.5". The GT500, or SVT, wheels = 18"x9.5". 255mm is the widest for the 8.5" wheel. To run the 285mm tire, you need the 9.5" wheel. Thanks for the information !!!!!!!! Link to comment Share on other sites More sharing options...
07sgt0720 Posted April 17, 2011 Report Share Posted April 17, 2011 i have been running the stock gt500 tires on my shelby gt wheels now for over 5k miles with absolutely no problems. 255 in the front and 285 in the rears. i know there is others on here doing the same thing also. Link to comment Share on other sites More sharing options...
socalwrench Posted April 17, 2011 Report Share Posted April 17, 2011 i have been running the stock gt500 tires on my shelby gt wheels now for over 5k miles with absolutely no problems. 255 in the front and 285 in the rears. i know there is others on here doing the same thing also. Not this again. Alright, the 285 will physically mount onto the 18x8.5 wide wheel. However, it is unsafe. Look at any tire manufacturer, or at the tire once it's mounted- and you will see why. If you want the tire to seat properly, have an even sidewall, and a flat contact patch- 255 is the widest your can go on the 18x8.5 wheel. In the old days with 14 and 15 inch wheels you could get away with stretching tires safely, but with larger wheels and shorter sidewalls these days- I would not recommend it. Link to comment Share on other sites More sharing options...
johnrehder Posted April 18, 2011 Report Share Posted April 18, 2011 SoCal is right on the money, the tire bead won't settle against the rim fully if the tire is too wide. If I had a chaulk board I could draw a nice diagram. More power to you if you have gotten away with it so far without issues. Not this again. Alright, the 285 will physically mount onto the 18x8.5 wide wheel. However, it is unsafe. Look at any tire manufacturer, or at the tire once it's mounted- and you will see why. If you want the tire to seat properly, have an even sidewall, and a flat contact patch- 255 is the widest your can go on the 18x8.5 wheel. In the old days with 14 and 15 inch wheels you could get away with stretching tires safely, but with larger wheels and shorter sidewalls these days- I would not recommend it. Link to comment Share on other sites More sharing options...
eagleridge4 Posted April 19, 2011 Report Share Posted April 19, 2011 I tried 275s on the stock wheels and felt that the sidewall bulged out too much. I would definitely NOT go 285 on the stock 8.5" wheels. Just get some new wheels. You need them for good brakes anyway. Link to comment Share on other sites More sharing options...
doublegrabber Posted April 19, 2011 Author Report Share Posted April 19, 2011 I tried 275s on the stock wheels and felt that the sidewall bulged out too much. I would definitely NOT go 285 on the stock 8.5" wheels. Just get some new wheels. You need them for good brakes anyway. Thanks for all the good information from everbody I stopped by Weldcraft today won't be doing anything till fall said there was a 4 to 5 week turnaround time at this time of the year Link to comment Share on other sites More sharing options...
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