275/55R20 Tire Size: 31.9" Tall, a 32-Inch Tire
Straight answer
A 275/55R20 stands 31.9 inches tall and 10.8 inches wide on a 20-inch wheel, which makes it a 32-inch tire in truck-speak. NTW stocks 25 tire models in this size right now.
275/55R20 dimensions
Overall diameter
31.91"
Section width
10.83"
Sidewall height
5.95"
Wheel diameter
20"
Circumference
100.2"
Revolutions per mile
632
≈ 31.9x10.8R20 flotation. Nominal math; real tires run a few tenths off depending on brand, load range, rim width, and air pressure.
What 275/55R20 means
- 275Section width: 275 mm (10.8") wall to wall
- 55Aspect ratio: sidewall is 55% 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.
275/55R20 compared to nearby 20-inch sizes
Speedometer column assumes your truck is calibrated for 275/55R20 and reads 65 mph.
| Size | Height | vs 275/55R20 | Width change | Actual speed | Compare |
|---|---|---|---|---|---|
| 285/55R20 | 32.3" | +0.4" (+1.4%) | +0.4" | 65.9 mph | Full comparison |
| 275/60R20 | 33.0" | +1.1" (+3.4%) | 0.0" | 67.2 mph | Full comparison |
| 33x12.50R20 | 33.0" | +1.1" (+3.4%) | +1.7" | 67.2 mph | Full comparison |
| 305/55R20 | 33.2" | +1.3" (+4.1%) | +1.2" | 67.6 mph | Full comparison |
| 295/60R20 | 33.9" | +2.0" (+6.4%) | +0.8" | 69.1 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.
Trucks that come with 275/55R20
Tires in stock in 275/55R20
25 models, 33 SKUs at NTW (different load ranges and sidewall styles). Refreshed daily.
| Tire | Type | Options | From |
|---|---|---|---|
| Cosmo Gripit_XT | All Terrain | 2 | $171 |
| Falken Wildpeak A/T4W | All Terrain | 2 | $310 |
| Mickey Thompson Baja Boss AT | All Terrain | 2 | $335 |
| Nitto Recon Grappler A/T | All Terrain | 2 | $318 |
| Nitto Ridge Grappler | All Terrain | 2 | $340 |
| Nitto Terra Grappler G3 | All Terrain | 2 | $302 |
| Toyo Open Country C/T | All Terrain | 2 | $264 |
| Venom Power Terra Hunter RT Plus | All Terrain | 2 | $266 |
| AMP Off-Road AT Terrain Attack | All Terrain | 1 | $267 |
| AMP Off-Road Terrain Attack R/T | All Terrain | 1 | $300 |
| AMP Off-Road Terrain Pro AT | All Terrain | 1 | $241 |
| Avix Off-Road TRAILTEK R/T | All Terrain, Mud Terrain, On/Off-Road | 1 | $284 |
| Bfgoodrich All-Terrain T/A KO3 | All Terrain | 1 | $312 |
| Bfgoodrich Trail-Terrain T/A+ | All Terrain | 1 | $259 |
| Falken Rubitrek A/T | All Terrain | 1 | $253 |
| Falken Wildpeak R/T01 | All Terrain | 1 | $355 |
| Fuel Off-Road Gripper AT | Mud Terrain, On/Off-Road | 1 | $276 |
| Kenda Klever RT | All Terrain | 1 | $316 |
| Mickey Thompson Baja Legend EXP | All Terrain | 1 | $312 |
| Toyo Open Country A/T III | All Terrain | 1 | $350 |
| Toyo Open Country H/T II | All Terrain | 1 | $274 |
| Toyo Open Country M/T | Mud Terrain | 1 | $471 |
| Toyo Open Country R/T | All Terrain | 1 | $337 |
| Toyo Open Country R/T Trail | All Terrain | 1 | $360 |
| Toyo Proxis ST3 | Highway | 1 | $161 |
Prices per tire at NTW when last checked; confirm at checkout.
Frequently Asked Questions
How tall is a 275/55R20 tire in inches?+
A 275/55R20 is 31.91 inches tall and 10.83 inches wide, with a 5.95-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 275/55R20 a 32-inch tire?+
Close enough that everybody calls it one. It measures 31.9 inches, so it's sold and talked about as a 32. The flotation equivalent is 31.9x10.8R20.
What does 275/55R20 mean?+
275/55R20 means a tire 275 millimeters wide with a sidewall 55% as tall as it is wide, built for a 20-inch wheel.
275/55R20 vs 285/55R20: how much bigger?+
285/55R20 is 0.4 inches taller (1.4%) and 0.4 inches wider. Going from 275/55R20 to 285/55R20, a speedometer reading 65 mph means you're actually doing 65.9.
Looking for another size? See the full truck tire size chart.