I posted a recent WTB for a kart tire size 12 x 4 -6. My problem was not knowing exactly what the numbers meant. Here is a simple definition I have found useful when going from one tire size to another:
There are 2 methods used to measure tires:
1: If a "x" separates the 1st 2 sets of numbers the 1st number is the overall diameter of the tire. The 2nd number is the overall width. The last number represents the rim diameter.
2: If a "/" separates the 1st 2 sets of numbers the 1st number is the overall width of the tire. The 2nd number identifies the section height. This is the measurement from the crown to the bead of the tire. The last number is the rim diameter. So for a 4.10/3.50-4 tire the overall diameter is 11" (3.5 + 3.5 + 4).
Now it's easy to convert from one method to the other and find a comparably sized tire. Thed
Kart tire sizes defined
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Thed Hester
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justin_cosgrove
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Re: Kart tire sizes defined
THANK YOU!!!!!! they are different from car sizes, I had guessed what you said, but now I know 
Cheers
Justin
Cheers
Justin