Learn how to measure different types of tires and rims with the charts below. Maintain and repair tires with Gempler's selection of tire supplies ranging from air gauges & chucks, flat tire prevention supplies, tire changing tools, and much more.
How to Measure Tires and Rims
Tire Sizes
Outside Diameter x Width x Rim Diameter
For Example: 18 x 8.50 - 8
A: 18" - Height of the tire; overall diameter
B: 8.5" - Width of the tire from sidewall to sidewall
C: 8" - Diameter of rim
Industrial Tire & Wheel Assemblies
Example:
4.80 x 8 Wheelbarrow tire assembly
OD: 16"
Hub Length: 6"
Axle Shaft: 5/8"
Wheel Offset
Positive Offset: A wheel with a positive offset moves the tire and wheel closer to the frame.
Rim Diameter & Width
Diameter: Rim diameter is measured from tire
bead seat area to tire bead seat area
Width: Rim width is measured from tire bead
seat area to tire beat seat area
ATV Tires
Example size: 20 x 7 - 8
A: 20" Height of tire overall diameter
B: 7" - Width of tire from sidewall to sidewall
C: 8" - Diameter of rim
Agricultural Wheels
Correct Way to Measure the Bolt Pattern of a 5 Bolt Wheel : Measure from center on one bolt hole straight across the wheel to the center of the two opposite bolt holes