Rivian R1T / R1S (20" LT Upgrade) Off-Road Tire Pressure Guide
Rivian R1T/R1S with LT tire upgrade. How switching from stock SL to LT tires changes your off-road airing down range and minimum safe PSI.
EV Note: This vehicle is significantly heavier than ICE counterparts due to the battery pack. Stay on the higher end of PSI ranges and never go below 20 PSI on standard wheels.
Vehicle Specs
| Spec | Details |
|---|
| Weight Range | 6,800 - 7,200 lbs |
| Stock Tire Size | 275/65R20 LT (KO2, Falken AT4W, Toyo AT3 EV) |
| Common Upgrade | Same size, different construction (LT vs stock SL) |
| Recommended Hose Kit | Quad+ 155" (MFQ+) with Rivian extension adapter |
Recommended PSI by Terrain
Notes
Common upgrade from stock P-Metric XL tires. LT construction provides stiffer sidewalls, better puncture resistance, and more confident airing down. Popular choices: BFG KO2, Falken Wildpeak AT4W, Toyo AT3 EV. Min safe 20 PSI (vs 22 on stock SL). Heavier tires reduce range 12-15%.
Hose Recommendation: Quad+ 155" (MFQ+) with Rivian extension adapter.
Shop MORRflate hose kits to air down all tires at once.
How to Air Down Your Rivian R1T / R1S
- Park on a flat, stable area before the trailhead.
- Set the parking brake and check current tire pressure with a gauge.
- Use your deflator or MORRflate system to release air to your target PSI (see table above).
- Adjust all four tires evenly. Drive a short distance, recheck, and fine-tune.
- Re-inflate before returning to pavement. Low pressures at highway speeds cause heat buildup and blowout risk.
Safety: Always re-inflate before returning to pavement. Running low pressures at highway speeds can cause heat buildup, sidewall damage, and even a blowout.
Shop MORRflate Gear
Read the Full Guide