305/50R20 Tire Size: 32.0" Tall, a 32-Inch Tire
Straight answer
A 305/50R20 stands 32.0 inches tall and 12.0 inches wide on a 20-inch wheel, which makes it a 32-inch tire in truck-speak. NTW stocks 8 tire models in this size right now.
305/50R20 dimensions
Overall diameter
32.01"
Section width
12.01"
Sidewall height
6.00"
Wheel diameter
20"
Circumference
100.6"
Revolutions per mile
630
≈ 32.0x12.0R20 flotation. Nominal math; real tires run a few tenths off depending on brand, load range, rim width, and air pressure.
What 305/50R20 means
- 305Section width: 305 mm (12.0") wall to wall
- 50Aspect ratio: sidewall is 50% of the width, so 6.0" tall
- RRadial construction
- 20Fits a 20-inch wheel
Want the full rundown on sidewall codes, load index, and speed rating? Read how to read a tire size.
305/50R20 compared to nearby 20-inch sizes
Speedometer column assumes your truck is calibrated for 305/50R20 and reads 65 mph.
| Size | Height | vs 305/50R20 | Width change | Actual speed | Compare |
|---|---|---|---|---|---|
| 275/55R20 | 31.9" | -0.1" (-0.3%) | -1.2" | 64.8 mph | Full comparison |
| 285/55R20 | 32.3" | +0.3" (+1.0%) | -0.8" | 65.7 mph | Full comparison |
| 265/60R20 | 32.5" | +0.5" (+1.6%) | -1.6" | 66.0 mph | Full comparison |
| 295/55R20 | 32.8" | +0.8" (+2.4%) | -0.4" | 66.6 mph | Full comparison |
| 275/60R20 | 33.0" | +1.0" (+3.1%) | -1.2" | 67.0 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.
Tires in stock in 305/50R20
8 models, 8 SKUs at NTW (different load ranges and sidewall styles). Refreshed daily.
| Tire | Type | Options | From |
|---|---|---|---|
| Bfgoodrich All-Terrain T/A KO3 | All Terrain | 1 | $429 |
| Falken Wildpeak A/T4W | All Terrain | 1 | $394 |
| Mickey Thompson Baja Boss AT | All Terrain | 1 | $432 |
| Nitto Recon Grappler A/T | All Terrain | 1 | $405 |
| Nitto Ridge Grappler | All Terrain | 1 | $427 |
| Toyo Open Country A/T III | All Terrain | 1 | $441 |
| Toyo Open Country R/T Trail | All Terrain | 1 | $454 |
| Toyo Proxis ST3 | Highway | 1 | $177 |
Prices per tire at NTW when last checked; confirm at checkout.
Frequently Asked Questions
How tall is a 305/50R20 tire in inches?+
A 305/50R20 is 32.01 inches tall and 12.01 inches wide, with a 6.00-inch sidewall on a 20-inch wheel. Real mounted tires vary a few tenths of an inch by brand, load range, and rim width.
Is 305/50R20 a 32-inch tire?+
Close enough that everybody calls it one. It measures 32.0 inches, so it's sold and talked about as a 32. The flotation equivalent is 32.0x12.0R20.
What does 305/50R20 mean?+
305/50R20 means a tire 305 millimeters wide with a sidewall 50% as tall as it is wide, built for a 20-inch wheel.
305/50R20 vs 285/55R20: how much bigger?+
285/55R20 is 0.3 inches taller (1.0%) and 0.8 inches narrower. Going from 305/50R20 to 285/55R20, a speedometer reading 65 mph means you're actually doing 65.7.
Looking for another size? See the full truck tire size chart.