Load Range F is a 10-ply rated trailer tire with a 95 psi maximum and roughly 3,960 lbs of capacity per tire in the common 235/85R16 size. Load Range E is also 10-ply rated but caps at 80 psi and about 3,520 lbs per tire in that size. C and D ratings suit lighter trailers. This guide gives you the exact PSI and capacity numbers, then helps you pick the right rating for what you actually tow.
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Load range is a tire's ply rating: how many layers of cord used to be layered into the carcass. More plies meant a stronger carcass, higher maximum pressure, and more weight capacity at that pressure. Modern radial tires achieve the same strength with fewer materials, so the letter is now a strength equivalent of the old ply count, stamped as "Load Range" on the sidewall:
Higher load range does not automatically mean more capacity at your size — capacity comes from the combination of size and pressure. A Load Range E 205/75R14 carries less than a Load Range D 235/85R16. Always read the specific tire's load and inflation table, not just the letter.
The numbers below use the most common heavy-trailer tire size, 235/85R16, at maximum sidewall pressure. Your exact tire's capacity comes from its own load-inflation table, but this chart is the right mental model:
| Load Range | Ply Equivalent | Max PSI | Capacity per Tire (235/85R16) | Typical Trailer |
|---|---|---|---|---|
| C | 6-ply | 50 psi | ~2,240 lbs | Single-axle utility, small boats, pop-ups |
| D | 8-ply | 65 psi | ~2,680 lbs | Tandem utility, mid-size travel trailers |
| E | 10-ply | 80 psi | ~3,520 lbs | Car haulers, large enclosed, heavy half-ton towing |
| F | 12-ply | 95 psi | ~3,960 lbs | Hotshot rigs, equipment trailers, commercial fleets |
The two-line answer: Load Range F means 12-ply equivalent, 95 psi max, roughly 3,960 lbs per tire in 235/85R16. Load Range E means 10-ply equivalent, 80 psi max, roughly 3,520 lbs per tire in the same size. Moving from E to F buys you about 440 lbs of capacity per tire — meaningful on a 12,000 lb hotshot trailer running four tires.
Divide the trailer's GVWR by the number of tires to get the approximate load per tire (tongue-weight trailers concentrate slightly more load on the rear axle than this simple math suggests, so leave margin). A practical rule:
Most single-axle trailers under 3,000 lbs GVWR are correctly fitted with Load Range C from the factory, and a C tire run at its proper pressure is not a compromise — it is the correct engineering choice. Bigger letters on a light trailer buy you a stiffer, harsher ride and worse grip, because a carcass needs load to flex the way it was designed. Downgrading a heavy trailer is dangerous; upgrading a light one mostly costs you comfort and money. When in doubt, match the placard riveted to the trailer tongue.
Both E and F are "10-ply class" tires in everyday conversation, but F adds two plies of equivalent strength, raising max inflation from 80 to 95 psi. What that actually buys:
If your loaded weight per tire stays under roughly 2,800 lbs, E is plenty. Between 2,800 and 3,500 lbs per tire, E is at its ceiling and F starts to make sense. Above 3,500 lbs per tire, F — or specialty G-rated rubber — is the correct tool.
The sidewall number is a maximum, not a recommendation. The correct cold pressure comes from the tire's load-inflation table: the least pressure that carries your actual per-tire load, plus a safety margin. Running an E or F tire at full sidewall pressure on a lightly loaded trailer gives you a center-wear pattern, a harsh ride, and less grip. Running it under-inflated while loaded heavy is far worse — flexing sidewalls build heat, and heat is what delaminates trailer tires.
The heavier the load, the faster a small problem becomes a catastrophic one. A Load Range F tire on a hotshot trailer can go from spec to delaminating in the time it takes to pass a truck at 70 mph, because heat accumulates faster than a driver can feel anything from the cab. Two things matter:
A trailer monitoring system that reports axle temperature and tire pressure to your phone while towing closes that gap: you see a tire trending down or an axle trending up while there is still time to pull off and look. For context on what numbers matter, read how hot is too hot for trailer tires.
Only if you need the extra capacity or heat margin. F carries about 12 percent more per tire in the same size and runs cooler at high loads. On a light trailer it just rides harsher and costs more.
Whatever your loaded per-tire weight calls for in the tire's inflation table — commonly 65 to 80 psi cold on half-ton tow rigs. Max sidewall pressure is a ceiling, not a target.
No. Keep size and load range identical across an axle so both tires share load and heat evenly. Mixed axles on a tandem should still be matched to the heavier spec.
Four E tires give 14,080 lbs of capacity — enough on paper, but only an 11 percent margin at max GVWR. For a working trailer that regularly loads near its rating, four F tires (15,840 lbs) give the margin and heat headroom most hotshot operators want.
Age kills trailer tires before tread does: replace at 5 to 6 years regardless of tread, and sooner if they live in the sun. Heat cycling from heavy loads shortens that further. For upkeep basics, see the trailer tire maintenance guide.
