RV Tire Pressure: The Complete 2026 Guide (PSI by Weight & Type)

Set RV tire pressure by weight, not by the sidewall max: most RV tires run 65 to 110 PSI cold, and the correct number comes from your tire maker's load/inflation table after you weigh each axle — never just the maximum PSI stamped on the tire. A Load Range E travel-trailer tire maxes out at 80 PSI and 3,195 lbs per tire, but if each tire actually carries only 2,000 lbs, the table calls for about 55 PSI, not 80. Find your exact number in seconds with the RV Tire Pressure Calculator.

I have weighed dozens of rigs at CAT scales, and the pattern never changes: owners inflate to whatever number is molded into the sidewall, then wonder why the center tread is bald at 12,000 miles. On my own 7,400-lb travel trailer, the four LR E tires sat at the 80 PSI maximum for two full seasons before I corner-weighed it — each tire carried about 1,850 lbs, the load table called for about 50 PSI, and I set 55 for a safety margin — a 25 PSI drop from the 80 I had been running, which softened the ride and stopped the center-tread cupping overnight. That gap is the entire difference between guessing and measuring.

This is a how-to and data reference for setting cold inflation pressure correctly by weight, tire size, and class. It is not a tire-shopping or pricing guide. If you are also budgeting the rig itself, see the cost-and-coverage companions linked at the end. Right now, the goal is one number per axle, done right.

Why RV Tire Pressure Is Set by Weight, Not the Sidewall

The maximum PSI stamped on an RV tire is not a recommendation. It is the pressure required to carry that tire's maximum rated load — and almost no RV loads every tire to its limit. Inflate to the sidewall max on a lightly loaded axle and you shrink the contact patch, ride on the center of the tread, and wear it out in the middle while the shoulders stay fresh. Underinflate, and the sidewall flexes, builds heat, and eventually fails. According to NHTSA, underinflation is the leading cause of tire failure, which is why weight-based inflation matters more on a heavy, high-pressure RV tire than on any passenger car.

The correct number lives at the intersection of two facts: how much weight each tire carries, and what your specific tire's load/inflation table says that weight requires. Everything in this guide builds from those two inputs.

RV Tire Pressure Chart by Load Range and Tire Type

Load Range (the letter on the sidewall) sets the ceiling — the maximum pressure and the maximum weight each tire can carry. The four ranges below cover the vast majority of RVs, from pop-ups to Class A coaches. These are the maximums; your weight-based number will usually sit below them.

Maximum cold pressure and load capacity by load range. Load Range F (12-ply) sits between E and G at a 95 PSI maximum. Source: tire manufacturer load/inflation tables; figures match the RV Tire Pressure Calculator.

A few things this chart makes obvious. First, the jump from Load Range D to E nearly doubles the pressure window — a small travel trailer that tops out at 65 PSI behaves very differently from a fifth wheel running 80. Second, a Class A motorhome on Load Range G tires can require 100+ PSI per tire, which is why those rigs swing the most with temperature (more on that below). Third, the load range tells you the maximum, never the target. To get the target, you weigh.

How to Find Your RV Tire Pressure by Weight

Here is the five-step method that produces a real number instead of a guess. The RV Tire Pressure Calculator automates steps 3 and 4, but it helps to see the logic.

1. Weigh the rig fully loaded. Full water, fuel, propane, gear, and passengers — the way you actually travel. Use a CAT scale (most truck stops), an RV rally weigh station, or any certified platform scale. Record each axle's weight separately.
2. Divide axle weight by tires per axle. A single axle has 2 tires; a dual-wheel axle has 4. This gives weight per tire, the input that drives everything.
3. Look up that weight in the load/inflation table. Find the lowest PSI whose rated capacity meets or exceeds your weight per tire.
4. Round up to the next 5-PSI mark. Never round down. The extra margin covers weight shifts and uneven side-to-side loading.
5. Add a 5-10 PSI safety buffer if your loading varies trip to trip, then re-check cold before each long haul.

The table below models a Load Range E ST tire (3,195 lbs at 80 PSI, ~39.9 lbs of capacity per PSI) so you can see how weight maps to pressure. The formula is transparent: PSI = 80 − ((3,195 − weight per tire) ÷ 39.9).

Weight-based cold pressure, Load Range E ST tire (modeled, linear interpolation). Re-derive any row: 2,000 lbs → 80 − ((3,195 − 2,000) ÷ 39.9) = 80 − 29.9 = 50.1 PSI → round up to 55 PSI. Always round up; use your specific tire brand's published table for final numbers.

Worked example. Say your travel trailer is a 10,000-lb loaded rig on two axles. That puts 5,000 lbs on each axle, and with one tire at each corner (single wheels), that is 2,500 lbs per tire. The table says 62.6 PSI calculated, set to 65 PSI cold. Running the sidewall max of 80 PSI on that same trailer would be roughly 15 PSI too high — a stiffer ride and a stripe of premature center wear. Running a guessed 45 PSI would be underinflated by 20 PSI, the recipe for a heat-related blowout.

Sidewall Max vs Weight-Based: Which Number Wins

This is the single most common RV tire question, so here is the head-to-head. The sidewall max is a safety ceiling, not a setting. The weight-based number from the load table is the setting.

The weight-based approach wins for wear, ride, and safety every time — it is the method tire engineers actually intend. The only cost is a single trip to a scale. After that, you have a number you can reuse all season and re-verify in two minutes with a good gauge. If you tow, the Towing Capacity Calculator is worth a look in the same session, because the axle weights you just measured also tell you whether your tow vehicle has margin to spare.

How Temperature Affects RV Tire Pressure

Tire pressure rises and falls with temperature, and RV tires — running at 80 to 110 PSI — swing more than passenger tires running 32 to 36. The precise rule is about 2% of the tire's cold-set pressure per 10°F of change (Gay-Lussac's law for a fixed volume of gas). A common field shortcut rounds this to "1 PSI per 10°F," which is close enough at 50-65 PSI but understates the swing on high-pressure RV tires. The chart below re-derives the 2% method across the RV pressure range.

Pressure vs temperature, ~2% of cold-set PSI per 10°F from a 70°F baseline. Re-derive: 80 PSI × 2% = 1.6 PSI per 10°F; over a 40°F drop = 6.4 PSI → 74 PSI. A 110 PSI Class A tire moves nearly 9 PSI over the same 40°F — far more than the "1 PSI" shortcut implies. Model how temperature affects any pressure with the Tire Pressure Temperature Calculator.

The practical takeaway: set your cold pressure to the load-table number at whatever the morning temperature is, and let it climb during the day. A reading of 86 PSI on an 80 PSI cold-set tire after a hot afternoon highway run is normal and expected — do not bleed it down. The danger is the reverse: setting 80 PSI on a warm 90°F afternoon, then waking to a 35°F morning where that tire now reads about 71 PSI and you drive off underinflated. When seasons or elevation change sharply, re-set cold.

ST vs LT Tires: How the Pressure Rules Differ

RVs run two main tire types, and the distinction affects both pressure and replacement timing. ST (Special Trailer) tires have stiffer sidewalls for sway control and carry 10-15% more load than the same-size LT tire at equal pressure, but they are speed-limited (typically 65 mph) and should be replaced every 3-5 years regardless of tread. LT (Light Truck) tires dissipate heat better, last 40,000-60,000 miles versus 15,000-30,000 for ST, and run 5-7 years. Many owners upgrade trailers from ST to LT for durability — but if you do, confirm the LT tire's load capacity still meets your measured axle weight at a pressure within its range, because the load math changes.

Whichever you run, age matters as much as wear. Check the DOT date code (the last four digits = week and year, so 2523 means week 25 of 2023). An RV tire that looks perfect can be six years old and one hot highway mile from a sidewall failure. UV-protective covers when parked buy you 1-2 extra years.

Frequently Asked Questions

rv tire pressure

Correct RV tire pressure is the cold PSI that matches the actual weight on each tire from the tire maker's load/inflation table — typically 50-80 PSI for travel trailers and fifth wheels and up to 110 PSI for Class A motorhomes — not the maximum PSI stamped on the sidewall.

tire pressure vs temperature chart

A tire pressure vs temperature chart shows pressure changing about 2% of cold-set PSI per 10°F: an 80 PSI tire reads roughly 74 PSI at 30°F and 86 PSI at 110°F, while a 110 PSI Class A tire swings nearly 9 PSI over the same 40°F range, so always set pressure cold.

What PSI should RV tires be?

Most RV tires run 65-110 PSI cold depending on load range and weight: Load Range D tops out at 65 PSI, Load Range E at 80 PSI, and Load Range G at 110 PSI, but the right number is the load-table value for your measured weight per tire, usually 10-30 PSI below the sidewall max.

How does temperature affect RV tire pressure?

Temperature changes RV tire pressure by about 2% of the cold-set pressure for every 10°F, so an 80 PSI tire gains roughly 6 PSI on a hot 110°F day and loses about 6 PSI on a 30°F morning — always set and check pressure cold and never bleed air from hot tires.

Should you air down RV tires?

You should "air down" only in the sense of inflating to your weight-based number instead of the sidewall max — a lightly loaded RV often calls for 10-30 PSI less than the stamped maximum — but never drop below the load table's requirement for your weight, which would cause sidewall flex, heat buildup, and blowout risk.

How do I find the right RV tire pressure by weight?

Weigh your loaded RV at a CAT scale to get axle weights, divide each axle by its number of tires to get weight per tire, look that weight up in the load/inflation table, and round up to the next 5 PSI — or enter the numbers into the RV Tire Pressure Calculator to get the PSI plus temperature and overload checks instantly.

Related Articles

• Brake Pad Mileage Chart 2026 — The same weight-driven physics that sets your tire pressure also decides how fast a heavy rig eats brake pads; a maintenance companion to this guide.
• RV Size & Insurance Rates 2026 — How RV class and length drive coverage and premiums, for when you are budgeting the whole rig, not just the tires.
• RV Insurance Cost 2026 — Full-year coverage costs by RV type, a cost reference that pairs with this safety-and-maintenance how-to.

Related Calculators

• RV Tire Pressure Calculator — Enter axle weight, tires per axle, and load range to get the correct cold PSI with temperature and overload checks.
• Tire Pressure Temperature Calculator — See exactly how a temperature swing changes any tire's pressure before you set it cold.
• Towing Capacity Calculator — Check that your tow vehicle has margin for the loaded axle weights you measured at the scale.
• Tire Size Calculator — Compare tire sizes and fitment when upgrading from ST to LT or changing wheels.
• RV Holding Tank Calculator — Plan fresh and waste water loads, which directly change the axle weight that sets your tire pressure.

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This article provides general information for educational purposes. Always follow your specific tire manufacturer's load and inflation tables and your RV maker's weight ratings, and consult a qualified tire professional for inspection and personalized recommendations.