Common 20-Inch Truck Tire Sizes | The Complete Fitment Guide

“20-inch truck tire sizes” means tires that fit 20-inch wheels, not tires measuring 20 inches tall or wide.

The first number in a metric size, like 275/65R20, is the tire’s width in millimeters, and the final “20” is the rim diameter in inches. The tire’s height is derived from the sidewall aspect ratio — the “65” here means the sidewall is 65% of the width. When people search for common 20-inch truck tire sizes, they usually want to know which standard sizes fit their 20-inch wheels.

Most Common 20-Inch Truck And SUV Sizes

For light trucks and large SUVs, the most common 20-inch sizes are metric. These mount on standard 20-inch rims designed for passenger-style vehicles.

Common OEM-style 20-inch truck and SUV sizes:

• 275/55R20
• 275/60R20
• 275/65R20
• 285/65R20
• 265/60R20

The 275/65R20 is a very popular pickup truck size, showing up on models like the Ford F-150, Ram 1500, and Toyota Tundra.

Off-Road And Flotation 20-Inch Sizes

When you move into off-road or flotation tires, the sizing changes to a different format — overall diameter in inches, then width, then rim size.

Common larger or off-road 20-inch sizes include:

• 31×11.50R20
• 33×11.50R20
• 33×12.50R20
• 35×11.50R20
• 40×15.50R20
• 42×16.50R20

These use a standard off-road tire calculator approach: the first number is the total tire height in inches, the middle number is the tread width, and the final number is still the wheel diameter. So a 33×12.50R20 is a tire that stands 33 inches tall, has a 12.5-inch-wide tread, and fits a 20-inch wheel.

Commercial Truck 20-Inch Sizes

Commercial and heavy-duty trucks use a completely different size family. These are the high-flotation and heavy-duty sizes you’ll see on work trucks, buses, and other vocational vehicles.

Common heavy-truck 20-inch sizes:

• 8.25R20
• 9R20
• 10R20
• 11.00R20
• 12.00R20
• 13.00R20

These tires are significantly larger and heavier than passenger-style 20-inch tires.

One critical warning: whole-number commercial sizes like 20, 22, and 24 inches are often tube or multi-piece wheel sizes, while metric 20-inch LT sizes mount on standard 20-inch rims. Never assume these are interchangeable.

Matching Tire Size To Your Wheel And Vehicle

The most important rule with 20-inch truck tire sizes is that the rim width must match the tire’s approved range. A 275/60R20 typically requires a 7.0 to 11.0-inch rim, while a 275/65R20 needs a 7.5 to 9.5-inch rim. Installing a tire on a wheel outside its approved range is a safety hazard.

Another frequent mistake is confusing load range or ply rating with physical size. The same nominal size might be sold as Standard Load or LT Load Range E, and those have very different max loads and pressures — even though they look identical on the sidewall.

If you’re ready to buy new shoes for your truck, check our tested roundup of the best 20-inch truck tires on the market to compare top-rated options side by side.

Before purchasing any 20-inch tire, verify three things: the tire size on your driver’s side door sticker, the approved rim width range for that specific tire model, and the load range your vehicle requires. Tire Rack’s fitment search tool is a reliable resource for matching tires to your exact truck model. A tire that fits one 20-inch truck may not fit yours — the rim diameter alone never guarantees compatibility across truck, SUV, commercial, flotation, or off-road applications.