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Some wheels have the diameter and width cast into the wheel. But if it isn't and you have to measure, it isn't hard.
Measure the section width of the tire. Easiest way is to lay the tire/wheel flat on the floor, lay a straightedge across it, and measure from the floor to the bottom of the straightedge. Call this "Measurement A".
Measure the distance between the bottom of the straightedge to the wheel flange (Measurement B). Subtract this measurement from Measurement A.
Turn the tire/wheel over and do the same for the flange on the other side (Measurement C). Measurements B and C are normally the same or very close, but can differ if the flanges are of different thicknesses.
Then subtract about an inch and an eighth more. This is approximately the total thickness of two average-thickness flanges.
As an example only (even though they may be close to your actual measurements), if Measurement A is 10-3/4" and Measurements B and C are about 7/8", your wheel is almost certainly an 8" wide wheel. If A is 11-1/8" and B and C are about 1/2" instead, it's a 9".
after that i checked a couple of websites on my kind of wheels, its true that 9.5' dont exist..isnt there a easier way to find out on my own what's the width of my wheel?..lol because im totaly lost, the way that you explained ..sorry..but thanks anways
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