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Basic Tire Facts

basic-tire-facts-thTire Measurement Chart

In an effort to clarify any confusion you may have regarding tire sizing, we offer the following:

Lawn and Garden, Industrial, ATV and Go-Kart Tires

There are two methods of identifying tires is this category:

  • Overall Diameter x Section Width x Rim Diameter
    An example of a Lawn & Garden tire is 13/6.50-6 An ATV tire size is 22/1100-8
  • Section Width x Section Height X Rim Diameter
    An example of this type of tire is 5.30x4.50-6

Bicycle, Lawn Cart and High Wheel Mowers

  • Overall Diameter x Section Width
    An example of this tire size would be 12x1.75

Trailer Tires

Like Lawn & Garden, Industrial and Go-Kart Tires, there are several ways to identify tires in the class.

  • Overall Diameter x Section Width x Rim Diameter
    An example of this tire would be a 16.5x6.5-8; this low profile type of tire is commonly used on campers, snow mobile and lawn equipment trailers.
  • Section Width x Section Height x Rim Diameter
    An example of this type of tire would be a 480/400-8. This is an older size designation, and is generally used for the smaller 8" and 12" rim sizes.

In recent years, 13", 14" and 15" trailer have been sized using a metric format. Trailer tires in these sizes are produced in radial and bias ply construction, they are measured as follows.

  • Section Width x Aspect Ratio x Rim Diameter
    An example of this size designation would be ST205/75R15
    • ST = Special Trailer
    • 205 = Tires Section Width stated in millimeters
    • 75 = Aspect Ration, this is the ration of Section Height to Section Width
    • R = Construction Code: R=Radial, D=Diagonal or Bias Ply
    • 15 = Rim Diameter