165/45R15 in inches

How tall is a 165 45R15 tire?

When converted to inches, the equivalent of a 165/45R15 tire size is 20.8x6.5R15. It means that:

  • height overall (or diameter) is 20.8 inches
  • tread width is 6.5 inches
  • wheel diameter is 15 inches

Learn more

165/45R15 tire size in inches
165/45R15 tire size chart

165/45R15 tire size in inches

165/45R15 Height / overall diameter: 20.8 inches
Height / overall diameter
20.8 inches
165/45R15 Tread width: 6.5 inches
Tread width
6.5 inches
165/45R15 Sidewall: 2.9 inches
Sidewall
2.9 inches
165/45R15 Wheel diameter: 15 inches
Wheel diameter
15 inches
165/45R15 Circumference: 65.3 inches
Circumference
65.3 inches
165/45R15 Revolutions: 970 per mile
Revolutions
970 per mile

165/45R15 — what does it mean?

  • 165 stands for tread width in millimeters
  • 45 is an aspect ration between the tread width and the sidewall in percents
  • R means that the tire has a radial construction
  • 15 is a wheel diameter (or rim) in inches

165/45R15 tire code
165/45R15 tire code

How to convert 165 45R15 to inches?

First of all, we need to divide 165 mm (width) by 25.4 (mm to inch conversion), which will give us a width of 6.5″. Then, 45% of the 6.5″ will result in 2.9″ sidewall.

To get the total height or tire diameter, we need to sum the 15″ rim diameter with two of the sidewall heights. It will result in a 20.8″ total tire diameter (or height).

For your convenience, below is a table for 165/45R15 conversion to inches:

Inches Metric
Overall diameter (height) 20.8″ 528 mm
Tread width 6.5″ 165 mm
Wheel diameter 15″ 528 mm
Sidewall height 2.9″ 74 mm
Circumference 65.3″ 1658 mm
Revolutions 970 / ml 603 / km

Alternatives to a 165/45R15 tire

If you're looking to upsize your 165 45R15 tires, try to stay within 3% deviation of an overall diameter for safety reasons.

Tire Tire diameter Width Wheel Size
105/70R15 20.8″ 0% 4.1″ 15″
115/70R15 21.4″ 0.75% 4.5″ 15″
T115/70D15 21.4″ 0.75% 4.5″ 15″
T115/70R15 21.4″ 0.75% 4.5″ 15″