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The 2002 model year launched the Chevrolet Avalanche. It was a pickup with an SUV-style cab and a clever folding midgate. Underneath, though, it was a close cousin of the Silverado and Suburban.
The Avalanche name covers two different trucks. The Avalanche 1500 and the heavier Avalanche 2500 left the factory on different tire sizes. This guide gives you both sizes, shows how to confirm yours, and explains wheels, bolt patterns, and tire types.
Key Highlights
- The 2002 Avalanche 1500 factory tire size is P265/70R17.
- The 2002 Avalanche 2500 factory tire size is LT245/75R16.
- Confirm your size on the driver’s door jamb placard before you buy.
- Stock wheels are 17-inch on the 1500 and 16-inch on the 2500.
- Both trucks use a 6×139.7 bolt pattern, the same as 6×5.5 inches.
Factory Tire Sizes for the 2002 Avalanche
Chevrolet built the 2002 Avalanche in two series. Each one has its own factory tire size. The table below sums them up.
| Model | Factory tire size | Wheel diameter |
|---|---|---|
| Avalanche 1500 | P265/70R17 | 17-inch |
| Avalanche 2500 | LT245/75R16 | 16-inch |
If you are not sure which series you own, check the badge on the truck or the placard in the door jamb. Never assume the two sizes swap. They fit different wheels and carry different loads.
Avalanche 1500: P265/70R17
The 1500 is the half-ton model, and P265/70R17 is its stock size. The P stands for passenger tire construction. The 265 is the width in millimeters.
The 70 is the aspect ratio, so the sidewall is fairly tall. The R17 means it fits a 17-inch wheel. Overall, the tire stands about 31.6 inches tall.
That tall sidewall suits the Avalanche’s mixed life. It rides comfortably on the road and still works on dirt and gravel. The Z71 off-road package used this same size.
Avalanche 2500: LT245/75R16
The 2500 is the heavy-duty model. It came with LT245/75R16 tires on 16-inch wheels. The LT stands for light truck construction.
These tires are built for weight. Most wear a Load Range E rating, which suits the 2500’s towing and payload work. If you tow with your 2500, do not downgrade to a passenger tire.
For more on load ratings, read our guide to what load range tire a Chevy 2500 needs. It explains why the rating matters as much as the size.
Why Did the Two Trucks Use Different Sizes?
The 1500 and 2500 were built for different jobs. The 1500 aimed at families and light work, so it got a taller, comfort-biased passenger tire. The 2500 aimed at towing and hauling, so it got an LT tire built for load.
That split also explains the wheel sizes. The 2500’s 16-inch wheels pair with strong, load-rated tires. The 1500’s 17-inch setup favors ride and handling.
Sizes also shifted a little across the Avalanche’s run from 2002 to 2013. Always go by your own truck’s placard, not another model year’s spec sheet.
How to Confirm Your 2002 Avalanche Tire Size
Twenty-plus years is a long life for a truck. A past owner may have changed the wheels or fitted a different size. Always confirm the size on your own truck before you order.
Start with the driver’s door jamb placard. It lists the factory tire size and the factory pressure for your exact truck. If the placard and the sidewall disagree, trust the placard.
The owner’s manual repeats the same specs. If your manual is missing, Chevrolet’s owner resources can help you find vehicle information. A tire shop can also confirm the size in a minute.
Reading the Sidewall: More Than the Size
The sidewall carries more than the size string. After the size you will find a load index and a speed symbol. Together they tell you how much weight the tire can carry and the speed it is built for.
Match or exceed the load index of the original tires. Going lower cuts your safety margin, especially on the 2500. A tire shop can decode the numbers if you are unsure.
Also find the DOT code. Its last four digits show the week and year the tire was made. On a truck this old, that date matters as much as the tread.
Stock Wheels and the 6×139.7 Bolt Pattern
Tire size and wheel size move together. The 1500 rides on 17-inch wheels, and the 2500 rides on 16-inch wheels. A 17-inch tire will never fit a 16-inch wheel, so match the last number of the size to your rim.
Both trucks use six lug nuts. The bolt pattern is 6×139.7 in metric terms. You will also see it written as 6×5.5 in inches.
Those two numbers describe the same pattern. 139.7 millimeters equals exactly 5.5 inches. Older articles sometimes claim they differ, but they do not.
The shared pattern means wheels from many GM trucks of the same era can bolt up. Still check diameter, width, and offset before you swap. A wheel that bolts on can still rub if the offset is wrong.
Choosing the Right Tire Type
Once the size is settled, pick the type that matches your driving. The Avalanche was built to do a bit of everything. Your tires should match the work you actually do.
Highway and all-season tires suit daily driving. They ride quietly and wear evenly on pavement. For most 1500 owners, this is the sensible default.
All-terrain tires add grip on dirt, gravel, and light trails. They carry chunkier tread and stronger sidewalls. Expect a little more road noise in return.
Winter tires use softer rubber and heavy siping. They grip in cold weather, when all-season rubber hardens. If your winters bring real snow, they are the safer pick.
Load-rated LT tires are the towing choice, above all on the 2500. Keep the load range at or above the factory spec. Never fit a tire rated below what the placard calls for.
Fit a Matched Set, and Check the Spare
Whatever type you choose, keep all four tires the same size and model. Mixing sizes or tread patterns can confuse the truck’s handling. On four-wheel-drive models, mismatched diameters also strain the drivetrain.
Replace tires in axle pairs at the very least. A full set of four is better when the budget allows. Rotate them on schedule so they wear evenly.
Do not forget the spare under the bed. On a 2002 truck it may be decades old and flat. Check its size, pressure, and age before you need it on a dark road.
Thinking of a Different Size?
Some owners want a taller or wider tire. A tire size calculator helps you compare options. It shows the new diameter and width, and how far the speedometer will drift.
Small changes are usually fine. Big jumps can rub the fender liners or upset the gearing. The bigger the change, the more homework it needs.
Our Silverado tire size guide covers the same ground for the Avalanche’s sibling. It explains clearance, lifts, and side effects in detail. The same rules apply here, since the trucks share a platform.
Pressure and Care for an Older Truck
Use the pressure printed on the door jamb placard. Do not use the maximum pressure molded into the sidewall. That number is a limit, not a target.
Check pressure monthly, and always when the tires are cold. If you change tire sizes later, our guide to calculating tire pressure for bigger tires shows how to adjust.
Age matters on a 2002 truck, too. Rubber hardens and cracks over time, even with tread left. The U.S. Tire Manufacturers Association explains tire care basics, and NHTSA’s tire safety pages cover wear, aging, and recalls. If a tire looks cracked or dry, replace it.
Keeping a 2002 Avalanche on the Road
These trucks are now more than two decades old. There is no fixed mileage that ends an Avalanche’s life. Condition depends on maintenance, rust, and how hard the truck has worked.
Tires tell part of the story. Uneven wear can point to worn suspension parts or a bad alignment. On an older truck, have the front end checked when you fit new tires.
Fresh rubber, correct pressure, and a sound front end keep an old Avalanche safe. It is cheap insurance for a truck that still earns its keep.
Conclusion
The 2002 Avalanche tire size is simple once you know your series. The 1500 takes P265/70R17, and the 2500 takes LT245/75R16. Confirm on the placard, match the wheel and bolt pattern, and pick a tire type that fits your driving.
Frequently Asked Questions
Can I use 265/70R17 tires on my Avalanche 1500 Z71?
Yes. P265/70R17 is the factory size for the 2002 Avalanche 1500, including the Z71. Confirm on your door jamb placard before ordering.
Is 6×139.7 the same as 6×5.5?
Yes, they are the same bolt pattern. 139.7 millimeters converts to exactly 5.5 inches. Sellers just write it two different ways.
What tire pressure does a 2002 Avalanche need?
Use the pressure on the driver’s door jamb placard. It was set for your truck and its factory size. Check it monthly with a gauge, when the tires are cold.