325/65R18 Tire Size: 34.6" Tall, a 35-Inch Tire
Straight answer
A 325/65R18 stands 34.6 inches tall and 12.8 inches wide on a 18-inch wheel, which makes it a 35-inch tire in truck-speak. NTW stocks 7 tire models in this size right now.
325/65R18 dimensions
Overall diameter
34.63"
Section width
12.80"
Sidewall height
8.32"
Wheel diameter
18"
Circumference
108.8"
Revolutions per mile
582
≈ 34.6x12.8R18 flotation. Nominal math; real tires run a few tenths off depending on brand, load range, rim width, and air pressure.
What 325/65R18 means
- 325Section width: 325 mm (12.8") wall to wall
- 65Aspect ratio: sidewall is 65% of the width, so 8.3" tall
- RRadial construction
- 18Fits a 18-inch wheel
Want the full rundown on sidewall codes, load index, and speed rating? Read how to read a tire size.
325/65R18 compared to nearby 18-inch sizes
Speedometer column assumes your truck is calibrated for 325/65R18 and reads 65 mph.
| Size | Height | vs 325/65R18 | Width change | Actual speed | Compare |
|---|---|---|---|---|---|
| 265/70R18 | 32.6" | -2.0" (-5.9%) | -2.4" | 61.2 mph | Full comparison |
| 33x12.50R18 | 33.0" | -1.6" (-4.7%) | -0.3" | 61.9 mph | Full comparison |
| 275/70R18 | 33.2" | -1.5" (-4.3%) | -2.0" | 62.2 mph | Full comparison |
| 295/70R18 | 34.3" | -0.4" (-1.1%) | -1.2" | 64.3 mph | Full comparison |
| 35x12.50R18 | 35.0" | +0.4" (+1.1%) | -0.3" | 65.7 mph | Full comparison |
Rule of thumb: inside 3% of stock diameter feels stock; past 8 to 10% and most owners budget for a re-gear. Run your exact numbers in the tire size calculator, or check what stepping down to 295/70R18 does.
Trucks that come with 325/65R18
- Ram 1500 (2011–2026) · 2021–2024: TRX, TRX Launch Edition
- Ram 1500 (2019–2026) · TRX
Tires in stock in 325/65R18
7 models, 7 SKUs at NTW (different load ranges and sidewall styles). Refreshed daily.
| Tire | Type | Options | From |
|---|---|---|---|
| AMP Off-Road Terrain Pro AT | All Terrain | 1 | $333 |
| Bfgoodrich All-Terrain T/A KO3 | All Terrain | 1 | $435 |
| Bfgoodrich Mud-Terrain T/A KM3 | Mud Terrain | 1 | $480 |
| Falken Wildpeak A/T4W | All Terrain | 1 | $398 |
| Nitto Recon Grappler A/T | All Terrain | 1 | $402 |
| Nitto Ridge Grappler | All Terrain | 1 | $431 |
| Toyo Open Country A/T III | All Terrain | 1 | $441 |
Prices per tire at NTW when last checked; confirm at checkout.
Frequently Asked Questions
How tall is a 325/65R18 tire in inches?+
A 325/65R18 is 34.63 inches tall and 12.80 inches wide, with a 8.32-inch sidewall on a 18-inch wheel. Real mounted tires vary a few tenths of an inch by brand, load range, and rim width.
Is 325/65R18 a 35-inch tire?+
Close enough that everybody calls it one. It measures 34.6 inches, so it's sold and talked about as a 35. The flotation equivalent is 34.6x12.8R18.
What does 325/65R18 mean?+
325/65R18 means a tire 325 millimeters wide with a sidewall 65% as tall as it is wide, built for a 18-inch wheel.
325/65R18 vs 35x12.50R18: how much bigger?+
35x12.50R18 is 0.4 inches taller (1.1%) and 0.3 inches narrower. Going from 325/65R18 to 35x12.50R18, a speedometer reading 65 mph means you're actually doing 65.7.
Looking for another size? See the full truck tire size chart.