🏔️🛻 Off-Road Truck
Tire Size Calculator

It varies by model, but generally: Full-size trucks (F-150, Silverado) can fit 33-inch tires with minor trimming. Midsize trucks (Tacoma, Colorado) can fit 285/70R17 or 285/75R16. Off-road trim packages (Raptor, ZR2) often fit larger tires stock. Check forums for your specific year/model for exact fitment data.

It's highly recommended but not always required. Going from stock to 35s typically requires 4.56-4.88 gears to maintain performance and fuel economy. With modern trucks (2015+), a calibration tune can help, but re-gearing provides the best results. If you tow heavy loads or have a V6, re-gearing becomes essential.

Choose based on your usage: 80%+ highway → All-Terrain (quieter, better MPG, longer life). Frequent mud/rocks → Mud-Terrain (superior off-road, louder, shorter life). Year-round daily driver → Rugged-Terrain or aggressive AT. Weekend wheeler → Mud-Terrain worth the tradeoffs. Consider having two sets if you're serious about both.

Without beadlocks: 15-20 PSI minimum for rock crawling, 12-15 PSI for sand/mud. With beadlocks: Can safely go to 5-10 PSI for extreme situations. Always factor in vehicle weight and tire construction. Start conservative (25 PSI) and adjust based on terrain. Carry a reliable air compressor and pressure gauge. Re-inflate to highway pressure before road driving.

Follow the load range rating, not the door jamb sticker for oversized tires. Load Range C: 35-40 PSI. Load Range D: 40-50 PSI. Load Range E: 50-65 PSI (or manufacturer max). Adjust based on ride quality and wear patterns. Higher pressures improve MPG but reduce comfort. Check tire temperature after highway driving - excessive heat indicates overinflation.

Typical impacts: 33-inch AT tires: 1-2 MPG reduction. 35-inch MT tires: 2-4 MPG reduction. 37-inch+ tires: 4-6 MPG reduction. Factors include tire weight, tread pattern aggressiveness, and whether you re-gear. Aggressive mud-terrains hurt MPG more than all-terrains of the same size. Re-gearing can recover 1-2 MPG of the loss.

Not always, but consider it: Stock wheels often work with 33-35 inch tires. Beadlock wheels recommended for 37+ or serious rock crawling. Wider wheels (9-12 inches) better support wider tires. Proper backspacing critical to avoid rubbing. Steel wheels more durable for rock trails. Aluminum lighter for better performance. Check load rating matches tire requirements.

Load Range indicates ply rating and load capacity: Load Range C (6-ply): Lightest, best ride, adequate for half-ton trucks. Load Range D (8-ply): Middle ground, good for towing and moderate off-road. Load Range E (10-ply): Heaviest duty, essential for 3/4-ton+, harsh ride but maximum puncture resistance. Higher load range = stiffer sidewall = harsher ride but better for heavy loads and rock protection.

Generally not recommended: Most 4x4 systems require identical tire diameters to avoid drivetrain binding. Some trucks allow 3% diameter difference max. Mixing widths (same diameter) sometimes acceptable but check manufacturer specs. For lifted trucks with manual locking hubs, more flexibility exists. Always match tire models and tread depth across all four tires for optimal traction control and stability.

More frequently than highway tires: Every 3,000-5,000 miles for aggressive off-roaders. Every 5,000-7,000 miles for mixed-use vehicles. After any severe off-road trip with trail damage. Use 5-tire rotation if you have matching spare. Check for rock damage, uneven wear, and sidewall cuts during rotation. Balance and alignment critical with heavy off-road tires.