2020 Ram ProMaster Tire Size & Pressure Specs

As an ASE-certified master technician, I regularly service commercial vehicles like the 2020 Ram ProMaster. Whether you operate a single 1500 cargo van or a whole fleet of 3500 heavy-duty cutaways, maintaining proper tire specs is critical for safety, fuel economy, and tire longevity under heavy payloads. Below is your comprehensive guide to the 2020 Ram ProMaster tire, pressure, and wheel specifications.

Quick answer

• OEM tire size: 225/75R16C (Commercial grade)
• Recommended cold tire pressure: 65 PSI Front / 72–80 PSI Rear (varies by 1500/2500/3500 models—always check your door placard)
• Bolt pattern: 5x130 mm
• Wheel size: 16x6.0 inches (Offset: ~68 mm)
• Load index/speed rating: 121/120R
• Spare tire size: Full-size matching spare (225/75R16C)
• TPMS frequency: 433 MHz

Tire sizes by trim

The 2020 Ram ProMaster is a purpose-built commercial vehicle. Because of its heavy-duty nature, Ram keeps the tire sizing standardized across all cargo and passenger van trims to ensure maximum load-carrying capability.

Note: Ensure replacement tires have the "C" (Commercial) designation or are LT-metric (Light Truck) with a Load Range E to safely support the vehicle's GVWR.

Recommended replacement tires

When replacing tires on a commercial van, prioritize load capacity, tread life, and all-weather traction. Here are my top technician-recommended picks for the 2020 Ram ProMaster:

1. Michelin Agilis CrossClimate – Premium An outstanding commercial-grade tire offering excellent all-weather traction (including severe snow) and long-lasting tread life under heavy loads.
2. Firestone Transforce CV – Mid-Range Specifically designed for commercial vans, this tire offers a great balance of durability, payload capacity, and budget-friendly pricing.
3. Nexen Roadian CT8 HL – Budget A solid entry-level commercial tire that provides decent treadwear and handling for city delivery vans without breaking the bank.

When to inflate to max load psi

Because the Ram ProMaster 2500 and 3500 models are heavy-duty commercial vans, managing your rear tire pressure based on your payload is crucial.

• Unloaded/Light Loads: Running the rear tires at the absolute maximum 80 PSI when the van is empty will result in a harsh, bouncy ride and premature center-tread wear.
• Max Payload/Towing: When carrying heavy cargo, upfitting equipment, or running the vehicle near its Gross Vehicle Weight Rating (GVWR), you must inflate the rear tires to the maximum recommended door placard pressure (typically 75 to 80 PSI) to prevent sidewall flex, excessive heat buildup, and potential tire blowouts.

Lug nut torque & pattern

The Ram ProMaster utilizes wheel lug bolts rather than traditional lug nuts on studs.

• Bolt Pattern: 5x130 mm
• Lug Bolt Torque: 145 ft-lbs (197 Nm) for standard steel wheels.
• Socket Size: 21mm (typically)

Tech Tip: Always use a calibrated torque wrench. Do not rely solely on an impact gun. Retorque the lug bolts after 50–100 miles of driving, as commercial vehicle wheels are prone to settling under heavy loads.

Common tire issues for this vehicle

• Premature Front Edge Wear: The Ram ProMaster is a front-wheel-drive van. The front tires handle all the steering, braking, and acceleration, often while the rear is heavily loaded. This leads to accelerated wear on the front axle. Rotate your tires every 5,000 to 7,500 miles.
• Underinflation Blowouts: Fleet drivers often forget to check tire pressures. Because these require high PSI (65-80), a visual check isn't enough to spot a low tire. Underinflation on these heavy vans causes rapid heat buildup and sudden sidewall failure.
• TPMS Sensor Damage: The 433 MHz TPMS sensors are frequently damaged by curbs during tight city deliveries or during improper tire mounting.

Need new tires? Find a trusted shop on Repairius.