Many people are confused by the idea of upsizing their wheels & tires, so I did some number-crunching and came up with a chart that hopefully might be a useful reference to those of us who want to put more modern rubber & wheels on our cars, while trying to preserve a more-or-less "muscle-car look", and not negatively affect alignment & suspension geometry. To do this, you have to upsize to a wheel & tire combination that's almost

*the exact same total height* as the tires we used back in the day. The total height is a simple formula of tire width multiplied by the aspect ratio, double this, then add the height of your wheel, converted to millimeters. Understandably, this metric business is confusing to you Americans. LOL (Just kidding!)

I'll start by explaining the formula, it's not rocket science, just simple math.

195/75R14: (195 mm x 0.75) x 2, + 355.6 mm. Total Height is therefore = 648.1 mm.

-195 x 0.75 is the height of ONE tire sidewall; you need to multiply this by 2 to factor in both sidewalls; i.e. the sidewall ABOVE the wheel & also BELOW the wheel.

-355.6 mm is the height of a 14" wheel, converted to millimeters. Use

www.onlineconversion.com to calculate the height of 15", 16" or larger wheels.

-Add the thickness of both sidewalls to the rim diameter and you have your total tire height, which can be used to mathematically compare total heights of bigger wheels, and ultimately find options that are nearly the same height (give or take 5 or so millimeters, preferably).

Of course, some of the results may be tire sizes that don't even exist, or are quite uncommon or rare. The more common sizes are easier to find and will have more brand & tread options, and will probably be cheaper.

I did several calculations and Google searches and came up with the following chart, for wheels up to 17" tall. I tried to focus on "thicker" sidewall aspect ratios, 50 to 60 series, as ratios lower than that start to look ridiculous on muscle-cars. I also limited my searching to 17", as (again) I think 18" and bigger wheels look ridiculous. So hopefully the following chart will be useful if you're wondering what your wheel & tire options are, if you're wanting to upsize your wheels & tires and take advantage of the corresponding benefits in handling, braking & cornering. These sizes shouldn't affect acceleration much as the widths of the rear tires & tire footprints are basically the same. These sizes should not require speedometer calibration, either, assuming you're using 255's or 275's already.

**Tire Size | Total Rim & Tire Height | Allowable Rim Width | Notes***Front*195/75R14 | 648.1 mm | 5.0" - 7.0"

205/70R14 | 642.6 mm | 5.5" - 7.5"

205/60R16 | 652.4 mm | 5.5" - 7.5" | Commonly available size

215/55R16 | 642.9 mm | 6.0" - 7.5" | Commonly available size

215/50R17 | 646.8 mm | 6.0" - 7.5" | Commonly available size

*Rear*255/60R15 | 687.0 mm | 7.0" - 9.0"

275/60R15 | 711.0 mm | 7.5" - 9.5"

275/50R16 | 681.4 mm | 8" - 10" ?? | Rare size

275/55R16 | 708.9 mm | 8" - 10" ?? | Rare size

275/50R17 | 706.8 mm | 7.5" - 9.5" | Rare size

255/55R17 | 712.3 mm | 7.0" - 9.0" | Uncommon size

245/55R17 | 701.3 mm | 7.0" - 8.5" | Fairly common size