375/50R18 Tire Size in Inches and Millimeters

375/50R18 tires have a diameter of 32.8" (833 mm), a tread width of 14.8" (375 mm), and a wheel diameter of 18" (457.2 mm).The sidewall of the tire is 7.4" (188 mm), and the tire's circumference is 103" (2615.6 mm). This means a 375/50R18 tire will make make 615 revolutions per mile, or 382 revolutions per kilometer.

375/50R18 Tire Front
375/50R18 Tire Side
Tire Circumference
615 Revs/Mile
Diameter32.8"833 mm
Width14.8"375 mm
Wheel18"457.2 mm
Sidewall7.4"188 mm
Circum103"2615.6 mm
Revolutions615 per mile382 per km

What Does 375/50R18 Mean?

The tire size 375/50R18 is a common size used on many trucks, SUVs, and other larger vehicles.

Here is what each part of the size designation represents:

  • 375: This number represents the width of the tire in millimeters. In this case, the tire is 375 millimeters wide.
  • 50: This number represents the aspect ratio of the tire, which is the height of the tire's sidewall as a percentage of its width. In this case, the sidewall height is 50% of the tire's width.
  • R: This letter indicates the tire's construction type. “R” stands for radial construction, which is the most common type of tire construction today.
  • 18: This number represents the diameter of the wheel that the tire is designed to fit on, in inches. In this case, the tire is designed to fit on a 18-inch wheel.

375/50R18 tire size meaning

How To Convert 375/50R18 Into Inches

The 375/50R18 conversion is fairly simple. The first number in the tire size, 375, represents the width of the tire in millimeters. To convert this to inches, we divide 375 by 25.4 (since there are 25.4 millimeters in an inch). This gives us approximately 14.8 inches.

The second number in the tire size, 50, represents the aspect ratio or the height of the tire as a percentage of its width. To calculate the height in inches, we multiply 14.8 by 0.50, which gives us approximately 7.4 inches.

Finally, the last number in the tire size, 18, represents the diameter of the wheel rim in inches. Therefore, the tire size 375/50R18 can be expressed in inches as roughly 14.8 inches wide, 7.4 inches tall, and designed to fit a 18-inch wheel rim.

Frequently Asked Questions About 375/50R18 Tires

How tall is a 375/50R18 tire?

A 375/50R18 tire has an approximate height, also known as the overall diameter, of 32.8 inches (833 mm). This height can vary slightly depending on the brand and model of the tire, as well as the amount of air pressure in the tire.

How wide is a 375/50R18 tire?

A 375/50R18 tire has a width of approximately 14.8 inches (375 millimeters). The width of the tire is the first number in the tire size designation, which in this case is “375”. It’s important to note that the actual width of the tire may vary slightly depending on the brand and model of the tire, and the width may also be affected by the amount of air pressure in the tire.

Alternate 375/50R18 Replacement Tire Sizes

Upsizing your wheels or tires? Replacement tires must be within 3% of the diametor of the original tire. The following sizes fall within that range - click on any size to see detailed info about that tire and wheel combination.

225/90R1632"812 mm16 mm
235/75R1831.9"809 mm18 mm
235/85R1732.8"832 mm17 mm
255/30R2632"814 mm26 mm
255/60R2032"814 mm20 mm
255/65R1932.1"815 mm19 mm
255/70R1832.1"815 mm18 mm
255/75R1732"814 mm17 mm
255/80R1733.1"840 mm17 mm
255/85R1633.1"840 mm16 mm
265/50R2232.5"825 mm22 mm
265/60R2032.5"826 mm20 mm
265/70R1832.6"829 mm18 mm
265/80R1632.7"830 mm16 mm
275/25R2833.4"849 mm28 mm
275/50R2131.9"809 mm21 mm
275/50R2232.9"835 mm22 mm
275/55R2031.9"810 mm20 mm
275/60R2033"838 mm20 mm
275/65R1832.1"815 mm18 mm
275/70R1732.2"818 mm17 mm
275/70R1833.2"843 mm18 mm
285/35R2431.9"810 mm24 mm
285/40R2332"812 mm23 mm
285/40R2433"838 mm24 mm
285/45R2232.1"815 mm22 mm
285/50R2233.3"845 mm22 mm
285/55R2032.4"822 mm20 mm
285/60R2033.5"850 mm20 mm
285/65R1832.6"827 mm18 mm
285/70R1732.8"832 mm17 mm
285/70R1833.7"857 mm18 mm
285/75R1632.8"834 mm16 mm
295/30R2633"838 mm26 mm
295/35R2432.1"816 mm24 mm
295/40R2433.3"846 mm24 mm
295/45R2232.5"825 mm22 mm
295/50R2233.7"855 mm22 mm
295/55R2032.8"832 mm20 mm
295/65R1833.1"841 mm18 mm
295/70R1733.3"846 mm17 mm
295/75R1633.4"848 mm16 mm
305/25R2632"812 mm26 mm
305/30R2633.2"844 mm26 mm
305/35R2432.4"824 mm24 mm
305/40R2332.6"828 mm23 mm
305/40R2433.6"854 mm24 mm
305/45R2232.8"833 mm22 mm
305/50R2032"814 mm20 mm
305/55R2033.2"844 mm20 mm
305/60R1832.4"823 mm18 mm
305/65R1732.6"828 mm17 mm
305/65R1833.6"853 mm18 mm
305/70R1531.9"809 mm15 mm
305/70R1632.8"834 mm16 mm
315/35R2432.7"830 mm24 mm
315/45R2132.2"817 mm21 mm
315/45R2233.2"843 mm22 mm
315/50R2032.4"824 mm20 mm
315/70R1532.4"823 mm15 mm
315/70R1633.4"848 mm16 mm
325/35R2332"812 mm23 mm
325/40R2232.2"819 mm22 mm
325/45R2233.5"851 mm22 mm
325/50R2032.8"834 mm20 mm
325/60R1833.3"847 mm18 mm
335/30R2432"812 mm24 mm
345/55R1732"812 mm17 mm
355/40R2233.2"843 mm22 mm
375/45R2033.3"846 mm20 mm
375/50R1832.8"833 mm18 mm
375/55R1632.2"818 mm16 mm
405/25R2432"812 mm24 mm