How to Measure Tires and Rims

TIRE SIZES   RIM DIAMETER & WIDTH
18 x 8.50 - 8 Tire Size   Example of Rim Diameter & Width
WHEEL OFFSET   INDUSTRIAL TIRE & WHEEL ASSEMBLIES
Positive & Negative Offset   Example: 4.80 x 8 Wheelbarrow tire Assembly
ATV TIRES   AGRICULTURAL WHEELS
Example size 20 x 7 - 8   Correct Way to Measure the Bolt Pattern of a 5 Bolt Wheel