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“B” (width of the wheel in inches)
“D” (diameter of the wheel in inches; Use caliper, or refer to marking on tire)
NOTE: The measuring rod used to determine the “A” distance is marked in
centimeters. You must convert to millimeters by multiplying the measurement by 10.
This is the value you must enter as the “A” measurement. See the examples below:
Example 1 (shown): 13.1cm X 10 = 131mm (Enter 131 as “A”)
Example 2: 9.5cm X 10 = 95mm (Enter 95 as “A”)
In some cases, you must round the figure to the nearest millimeter as seen below:
Example 3: 3.75cm X 10 = 37.5mm (Enter 37 as “A)