[57NAPCO]

Im needing some conversion help with my present tire/wheel combo. Im having a custom 700R4 built for my ride. The gentleman building it wants to know what the total height from ground to top of tire would be in inches if they were 15 inch rims and tires

my tires and rims: BF Goodrich 235/50 ZR18 M+S on 18 inch rims

I've e-mailed a couple of tire stores and they dont seem to be interested in helping a person out..

Thanks Guys..

[bracketeer]

P stands for Passenger Car. Light Truck tires will replace the P with 'LT'.
185 is the tire's width in millimeters.
60 is the aspect ratio, that is, the ratio of sidewall height to width. In this case, the sidewall height is 60 percent of the tire width, which works out to approximately 111 millimeters.
R means the tire is of radial-ply construction. A B indicates a bias-ply construction, but this design is all but extinct.
14 indicates the wheel diameter in inches. Why not in millimeters, like the tire width? Wheel diameters have traditionally been in inches, even in countries where the metric system is the standard.
82 is the tire's load index, a reflection of how much weight it will support. When choosing a tire, you must make sure the new tire's load index is at least equal to the one it will be replacing. This index does increase with tire size, so matching or exceeding it should not be a problem.
H is the tire's speed rating. Not all tires are speed rated; this does not necessarily mean a tire is of lower quality, but simply means the tire design has not been subjected to a test originally developed in Europe. The H rating means the tire can run at a sustained speed of 130 mph. Other common ratings are S (113 mph), V (149 mph) and Z (149+ mph).