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2013-14 Shelby GT500
BF Goodrich g-Force COMP-2 A/S
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<blockquote data-quote="Catmonkey" data-source="post: 15614148" data-attributes="member: 124025"><p>I was using data from tire rack for cross sections primarily. If you understand how a stated tire size is calculated, those comparison models use that formula to make calculations. It has nothing to do with actual data. I used MPSS for my calculations and the Goodyear data from Tire Rack. MPSS have rim protectors so they tend to be a little wider in the cross section. A 285 on the front without a drop, would probably be fine. It's going to get tight if you do. </p><p></p><p>I just think the 295 would live better with the bump stop bracket. Lots of guys run wider rubber with the bump stop bracket, but I would not be comfortable doing that. Again a 305 would be tight with a drop. Depends on the tire. Best thing to do is look at the published widths and look at what rim width it's measured on. Take one-half of the increase in that measurement rim width into account with increase and decreases in you width into account for the increase or decrease in the cross section.</p><p></p><p>The tires I had on my car were 315/35-20s. My rear wheel has been widened to 11", which pushes most of the additional width inboard. They were mounted using an 8mm custom spacer. I've since gone to 325/30-20s with a 1/4 spacer, but the photo has the 315s. That tire was just too tall in my opinion. The rear is lowered ~3/4". While I have SVTPP front springs, I was using a different strut mount and the springs were mounted on Koni sports. Those two mods probably account for about 3/8" of drop.</p><p></p><p>Working on Catmonkey 4.0 at the moment.</p></blockquote><p></p>
[QUOTE="Catmonkey, post: 15614148, member: 124025"] I was using data from tire rack for cross sections primarily. If you understand how a stated tire size is calculated, those comparison models use that formula to make calculations. It has nothing to do with actual data. I used MPSS for my calculations and the Goodyear data from Tire Rack. MPSS have rim protectors so they tend to be a little wider in the cross section. A 285 on the front without a drop, would probably be fine. It's going to get tight if you do. I just think the 295 would live better with the bump stop bracket. Lots of guys run wider rubber with the bump stop bracket, but I would not be comfortable doing that. Again a 305 would be tight with a drop. Depends on the tire. Best thing to do is look at the published widths and look at what rim width it's measured on. Take one-half of the increase in that measurement rim width into account with increase and decreases in you width into account for the increase or decrease in the cross section. The tires I had on my car were 315/35-20s. My rear wheel has been widened to 11", which pushes most of the additional width inboard. They were mounted using an 8mm custom spacer. I've since gone to 325/30-20s with a 1/4 spacer, but the photo has the 315s. That tire was just too tall in my opinion. The rear is lowered ~3/4". While I have SVTPP front springs, I was using a different strut mount and the springs were mounted on Koni sports. Those two mods probably account for about 3/8" of drop. Working on Catmonkey 4.0 at the moment. [/QUOTE]
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2013-14 Shelby GT500
BF Goodrich g-Force COMP-2 A/S
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