What size tires are on a 4th generation RAM?
There isn’t a single tire size for all 4th generation RAM pickups—the size depends on the year, trim level, and wheel package. Most factory setups fall roughly between 255/70R17 and 275/60R20, with some trims offering 22-inch wheels.
Understanding tire sizing on the 4th generation RAM
The 4th generation RAM 1500, produced from 2009 to 2018, was offered in multiple trims (Tradesman, SLT, Big Horn/Lone Star, Sport, Outdoorsman, Laramie, etc.) and with a variety of wheel packages. Because tire sizes are linked to the chosen wheels and suspension, the exact factory size you received could differ from another truck with the same model year. To confirm the correct size for your specific vehicle, check the door placard on the driver’s side jamb or refer to the owner's manual.
Typical factory sizes by wheel diameter
These sizes reflect common configurations used by many 4th generation RAM trucks. Exact sizes vary by year, trim, and optional packages; always verify your specific size on the vehicle placard.
- 17-inch wheels: 255/70R17 or 265/70R17
- 18-inch wheels: 275/65R18
- 20-inch wheels: 275/60R20
- 22-inch wheels: 275/50R22 (optional on some trims)
Knowing the correct tire size is important for ride quality, speedometer accuracy, and overall vehicle performance. When in doubt, verify against the original equipment specifications for your exact VIN and build date.
How to verify your exact size
To ensure you’re using the correct tire size for your 4th generation RAM, follow these steps:
- Inspect the tire sidewall for the size imprint (for example, P275/60R20).
- Look at the door placard on the driver's door jamb for the original factory size.
- Consult the owner's manual or the vehicle’s build sheet/VIN lookup from a dealership or RAM's official resources.
- If you’ve changed wheels or tires, note that aftermarket sizes may differ from factory specs; confirm compatibility with your vehicle’s suspension and ABS systems.
Accurately identifying the correct size helps maintain proper speedometer readings, handling, and load capacity, and it can affect warranty coverage and tire wear.
Summary
For the 4th generation RAM, tire sizes are not universal. They depend on the truck’s year, trim, and wheel package. Common factory sizes range from 255/70R17 on 17-inch wheels to 275/60R20 on 20-inch wheels, with 22-inch options on some trims. Always verify the exact size on the vehicle’s placard or build sheet to ensure proper fitment and performance.
