Tire pressure is measured in PSI (pounds per square inch). The correct pressure for your car is not on the tire — it’s set by the vehicle manufacturer based on suspension geometry, load rating, and ride quality targets. Two cars running the same tire size can have completely different pressure specs.
Quick answer
Check the sticker inside your driver’s door jamb. That number — not the one molded into the tire sidewall — is your target. Most passenger cars run 32–36 PSI. Check when tires are cold: before the first drive of the day, or after sitting at least 3 hours. Hot tires read 4–6 PSI higher than actual.
Specifications
| Vehicle Type | Typical Front PSI | Typical Rear PSI |
|---|---|---|
| Compact / sedan | 32–35 | 32–35 |
| Mid-size sedan / crossover | 33–36 | 33–38 |
| Full-size SUV | 35–40 | 35–42 |
| Light truck / pickup (unloaded) | 35–45 | 35–65 |
| Compact spare / donut | 60 | 60 |
| Temperature effect | ~1 PSI lost per 10°F drop in ambient temp | |
Front and rear specs often differ — especially on trucks and performance vehicles. Always check both axles separately on your door jamb sticker.
How to find your spec
- Driver’s door jamb sticker — open the driver’s door and look for a label on the door frame or B-pillar. Lists front and rear PSI separately, sometimes spare tire too. This is always the authoritative source.
- Owner’s manual — look under “Tires” or “Specifications.” Also lists alternate pressures for maximum load or optional tire sizes.
- Fuel door label — some manufacturers put a secondary tire placard inside the fuel door.
- TPMS system — if your car has tire pressure monitoring, the threshold it monitors to reflects your spec. Check the owner’s manual for the exact set point.
- What to ignore — the large number molded into the tire sidewall (e.g., “Max Press 51 PSI”) is the tire’s structural maximum, not your car’s spec. Never use it as a target.
How to check
- Check when cold — before your first drive of the day, or after sitting 3+ hours. Driving heats the air inside and raises PSI by 4–6.
- Remove the valve cap from the wheel’s inner edge.
- Press your gauge firmly onto the valve stem — no hissing means a good seal. Read the PSI.
- Compare to your door jamb sticker. Add air at a gas station compressor or portable pump to raise pressure. Press the valve center pin to release air if overfilled.
- Recheck after adjusting. Recheck the spare every 3 months.
What goes wrong
- Using the sidewall number — “Max Press 51 PSI” is the tire’s structural limit, not your target. Over-inflation causes center tread wear, harsh ride, and reduced wet-grip.
- Checking hot tires — reads 4–6 PSI above actual cold pressure. You’ll bleed air out unnecessarily, leaving the tires underinflated.
- Ignoring the rear — many vehicles spec different front and rear pressures. Running the same PSI all around affects handling balance and wear patterns.
- Forgetting seasonal adjustment — pressure drops ~1 PSI per 10°F. A correctly inflated summer tire can be 5–6 PSI low by January without a single leak.
- Neglecting the spare — compact spares require 60 PSI and lose pressure sitting unused for months.
Sources
NHTSA — Tire Pressure Monitoring Systems (TPMS) & Safety
DOE — Tire Inflation & Fuel Economy Data
