Trailer Tires

Overall Diameter × Section Width × Rim Diameter

A common size would be a tire used on campers, snow mobile and landscaper’s trailers：16x6.50-8

Referring to the drawing on the left

Overall tire diameter is 16 [C]

Section Width is 6.50 [A]

Rim Diameter is 8”.

Section Height x Section Width x Rim Diameter

An older size designation commonly used on small boat or camping trailers and log splitters 4.80x4.00-8.

Again referring to the drawing on the left,

Section Height is 4.80 [B]

Section Width is 4.00 [A]

Rim Diameter is 8”.

Section Width x Aspect Ratio x Rim Diameter

Aspect Ratio is the ratio of Section Height to Section Width.

In recent years, 13”, 14” and 15” trailer tires have followed a P-Metric format, where tire dimensions are metric - ST205/75D14.

In this example ST means Special Trailer:

Section Width [A] is 205 mm.

Aspect Ratio the relationship of Section Height [B] to Section Width [A] is 75 or 75% - Rim Size is 14”