How big is a 325 65 tire

325/65R18 In Inches - Tire Sizes Fitting & Alternatives

by Sullivan Kane

What size tire is 325/65R18 in Inches?

The 325/65R18 equivalent to 34.6x12.8R18 in inches, as follow:

  • 34.6 inches (880mm) stand for the tire diameter, also referred to as the tire height
  • 12.8 inches (325mm) is the tire width, this may also know as the section width
  • 18 inches (457mm) represent the rim diameter or called the wheel diameter that can be mounted on.

Tire Diameter34.6"880 mm
Tread Width12. 8"325 mm
Rim Diameter18"457 mm
Sidewall Height8.3"211 mm
Circumference108.7"2761 mm
Revolutions583 revs/km362 revs/mile


583 Revs/Mile

How big is a 325/65R18 tire’s height?

The overall diameter of a 325/65R18 is 34.6 inches or 879 mm tall (measurement of a tire’s outside diameter through its exact center when inflated with no load.

How wide is a 325/65R18 tire’s width?

The 325/65R18 has a width of 12.8 inches or 325 mm wide. This is the measurement of the tire at its thickest point, the distance between the outer sidewall’s widest point and the inner sidewall’s widest point. This physical width of the tire can change if the tire is mounted on a wheel slightly wider or narrower than the size indicated by the rim width.

What is a 325/65R18 tire sidewall height?

The 325/65R18 has a sidewall height of 8.3 inches or 211 mm tall. It’s measured from the wheel rim to the top of the tread, expressed as a percentage of tire width.

What size rim do you need for 325/65R18?

The 325/65R18 tire has a size rim of 18 inches or 457 mm. This number represents the distance between the two bead seat areas where the tire is sealed onto the wheel.

How many revolutions for 325/65R18 per mile or kilometer?

The 325/65R18 performs 583 revolutions per mile or 362 revolutions per kilometer. Revolutions per mile indicate the number of times a tire revolves while it covers the distance of one mile/kilometer

How about 325/65R18 tire circumference?

The circumference of 325/65R18 is 108.7 inches or 2761 mm.

What’s wider or narrow than 325/65R18 is acceptable?

You can replace the 325/65R18 tires that are within ±3% of the overall tire diameter. In this case, it’s between 33.6 and 35.6 inches (853mm to 905 mm). Check our tire size chart here or the tire size calculator tool here to find your size.

Tire Size Chart for 18" Wheels:

38″ Tire Diameter

  • 395/65R18 = 38.2x15.6R18

*Disclaimer: The information provided on the tire size is for general informational purposes only. We recommend that you consult a certified tire specialist or National Highway Traffic Safety Administration (NHTSA) sets specific guidelines for tires used on vehicles.

Sullivan Kane

Tire Technician at TireSizesCalculator

Sullivan is a Tire Technician specializing in tire repair at TireSizesCalculator. With over 6 years of experience in the industry, Sullivan has become an expert in tire repair, maintenance & installation.

Best rated 325/65R18 tires.

This size in inches and what rims fit this size.

325/65 R18 in inches What rims fit 325/65 R18 tires What is 325/65 R18?

Best 325/65 R18 All Terrain Tires

Cooper Discoverer AT3 XLT

Overall: 87%

Dry: 92%

Wet: 88%

Snow: 78%

Comfort: 87%

Wear: 89%

Check on Amazon

Falken WildPeak A/T3W

Overall: 82.8%

Dry: 78.7%

Wet: 80%

Snow: 80%

Comfort: 87%

Wear: 90%

Buy again: 97%

Check on Amazon

Sumitomo Encounter AT

Overall: 82%

Dry: 88%

Wet: 88%

Snow: 85%

Comfort: 86%

Wear: 79%

Check on Amazon

BFGoodrich All-Terrain T/A KO2

Overall: 80%

Dry: 91%

Wet: 87%

Snow: 87%

Comfort: 83%

Wear: 82%

Check on Amazon

Hankook Dynapro AT2

Overall: 74%

Dry: 89%

Wet: 82%

Snow: 65%

Comfort: 90%

Wear: 88%

Check on Amazon

Toyo Open Country A/T II

Overall: 68%

Dry: 87%

Wet: 79%

Snow: 69%

Comfort: 83%

Wear: 81%

Check on Amazon

Nitto Ridge Grappler
Check on Amazon

Best 325/65 R18 Off Road/Mud Terrain Tires

BFGoodrich Mud-Terrain T/A KM3

Overall: 91%

Dry: 91%

Wet: 88%

Snow: 79%

Comfort: 79%

Wear: 83%

Check on Amazon

Goodyear Wrangler DuraTrac

Overall: 84. 6%

Dry: 85%

Wet: 81.5%

Snow: 94%

Comfort: 77%

Wear: 85.5%

Buy again: 90%

Check on Amazon

Cooper Discoverer STT PRO

Overall: 80.7%

Dry: 78.3%

Wet: 65%

Comfort: 75%

Wear: 90%

Buy again: 100%

Check on Amazon

Hankook Dynapro M/T

Overall: 73.6%

Dry: 73.7%

Wet: 75%

Snow: 85%

Comfort: 58%

Wear: 83%

Buy again: 75%

Check on Amazon

Best 325/65 R18 All Terrain TiresBest 325/65 R18 Off Road/Mud Terrain Tires

325/65 R18 in inches

325/65 R18 tires diameter is 34. 6 inches, section width is 12.8 inches and rim diameter is 18 inches. So the closest and almost equal metric tire size of 325/65R18 existing size in inches is 35x13.00R18, which is 1.16% taller and 1.56% wider.

Compare 325/65 R18 vs 35x13.00R18 with our handy tire size calculator.

What rims fit 325/65 R18 tires?

For each tire size there often there are several wheel sizes. You can't put very wide tires on narrow rims or vise versa. Here is what size of the rims do you need for 325/65 R18 tires:

Rim diameter x rim width

  • 18x9 inches

325/65 R18 – what does it mean?

Parameter Meaning
325 The first number shows that the tire has a width of 325 millimeters or approximately 12.8 inches.
65 The second number is the aspect ratio. In this case, it is 65%. It shows the height of the tire from the ground to rim edge, which is 65% of the width or ~ 212mm
R18 The letter R means this tire is radial. Most of all tires nowadays are radial. The number is the tire diameter in inches. It means that tire will fit 18 inch wheels

325/65 R18 vs 275/70 R18 Tire size comparison with graphical visualization

Your machine size

/ 253035404550556065707580859095100 R 121314151617181920212222.52324


135145155165175185195205215225235245255265275285295305315325335345355365375385395 / 253035404550556065707580859095100 R 121314151617181920212222. 52324

New tire size


Index Old New Difference
Diameter - - -
Width - - -
Circumference - - -
Profile height - - -
RPM - - -
Clearance change -
Result: -

With speedometer:

Real speed will be:

Size comparison between 325/65 R18 and 275/70 R18 tires.

In the table above you can see a detailed comparison of the difference in dimensions, parameters and performance between a 325/65 R18 tire and a 275/70 R18 tire. The results of the calculations are also presented in the form of visual models (infographics), on which the tire with a size of 325/65 R18 is on top, and with a size of 275/70 R18, respectively, at the bottom. The visualization was generated in two projections: lateral (left) and frontal (right). The online calculator compares tires according to the following characteristics: diameter, width, circumference, profile height, revolutions per km, ground clearance change. In addition, the potential deviation between the actual speed and the speed displayed on the speedometer is calculated, which can occur if the difference between tires 325/65 R18 and 275/70 R18 is significant.

If you want to compare other tyres, just select the required parameters in the drop-down fields and click on the green button.


Side Comparison Frontal comparison

See also:

Sports package selection

Tire calculator

Car selection

How does it work?

Width Height Diameter ID IS Runflat Brand (manufacturer) Tire model Season Spikes Applicability
/ R 0144.

Learn more