The largest tire size you can fit on a stock Ram 1500 will depend on the specific year, make, and model of your truck. However, as a general guideline, the maximum tire size you can install on a stock Ram 1500 without modifications is usually around 33 inches in diameter.
It’s important to note that installing larger tires than what is recommended by the manufacturer can affect your truck’s performance and safety. Larger tires can put more strain on your vehicle’s suspension and braking system, and may even cause rubbing or other clearance issues.
If you’re interested in upgrading to larger tires, it’s best to consult with a professional mechanic or tire specialist who can recommend the best tire size for your specific truck model and ensure that it is installed properly.