how to measure

Width is measured in a straight line from the furthest point on one sidewall, across the tread, to the furthest point on the opposite sidewall.

The aspect ratio is the height of the tire sidewall. A smaller number means a lower profile, and the height-to-width ratio is shown as a percent.

Rim diameter is the diameter of the rim/wheel on which the tire will be mounted, in inches.

tire width
tire aspect ratio
rim diameter
1939 Harley-Davidson
ES
For reference only, please consult your owner’s manual to confirm your sizes
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  • Front/Rear HF318 4.00H-18 Blackwall Tire
    exact fit
    5.0 star rating (3)
    $80.88
    Same Day Shipping
    Part #: 540773 Mfg Part #: 25-31818-400BTT

  • Front Or Rear HF307 4.00-18 Blackwall Tire
    exact fit
    $79.88
    Same Day Shipping
    Part #: 544579 Mfg Part #: 25-30718-400BTT

Viewing Results 1 - 2 of 2