Can some one please explain to me how tires are measured?
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Tires explained
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For any given car tire.
215/40ZR-17
215 = Section width - 215 millimeters the ouside of the sidewall, across the traad, to the other sidewall.
40 = Aspect ratio - The height of the sidewall, pertaining to the percentage of the number (40%) So for a 215mm tire, the sidewall is 86mm or 3.39")
Z = Speed rating (bottom of post)
R = Is Radial tire construction
17 = The height of the wheel, without the tire.
The overall height can be calculated by adding wheel height, 17" + 3.39" + 3.39" = 23.78"
Speed Rating
Q - Up to 100 mph
S - Up to 112 mph
T - Up to 118 mph
U - Up to 124 mph
H - Up to 130 mph
V - Up to 149 mph
W - Up to 168 mph
Y - Up to 186 mph
Z - Up to 149 mph and over
Here is a good tool to find a tire that has the relatively same size as you are running currently. http://www.discounttiredirect.com/di...foTireMath.jsp
matt
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Originally posted by Robhalf inch width doesnt make much difference in tire sizing, especially with the fat sidewalls of 14" rubber
For example, a set of Potenza RE950's in 195/65-14 is designed for a rim of 6" (the "measured width" for the tire). However, from sidewall to sidewall (section width) it's actually 7.8". So, it's fair to say that on a 14x6 bottlecap, you have a section width of 7.8". Those same tires will fit on a 6.5" wide basketweave, and will probably have a section width closer to 8".
Note, however, that section width is measured with no weight bearing on the tire (off the car). The amount of weight you have on the tire will increase sidewall flex, and cause a greater "Section width" that touches the ground.
Hope that clears it up.
KrisMy mountains are better than yours.
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