235/80R17 Tire Specs: Load Range, Ply Ratings, and What They Mean

LT235/80R17 tires typically carry load range E, a 120/117 load index, and 80 psi max inflation, though exact specs vary by model.

Two tires stamped 235/80R17 can carry different maximum loads, speed ratings, and approved rim widths. That label is a size, not a promise about strength. Here is what each number controls and which specs matter when buying.

What Do The Numbers In 235/80R17 Mean?

• 235 — section width, 235 mm (about 9.25″)
• 80 — sidewall height, 80% of section width
• R — radial construction
• 17 — fits a 17-inch wheel

Current listings put overall diameter near 31.8″ and section width around 9.2–9.3″. Approved rim width usually falls in the 6.0–7.5″ or 6–8.0″ range depending on model. This size shows up on heavy half-ton pickups and work vans, but two models in the same size can differ in weight, tread depth, and rolling diameter, changing how the truck rides and pulls.

What Does Load Range E (10-Ply) Actually Mean?

Load range is a legacy strength category tied to how much air pressure and load a tire can carry; in this size E is the most common light-truck rating. Retail listings print “10 ply” next to it — a ply rating label, not a literal count of carcass plies. Modern radials rarely use ten physical layers; the label survives as shorthand for the strength class. Ply rating and load range describe the same concept: how much load the tire handles at a given inflation. Drop the pressure and capacity drops — an E-rated tire at 50 psi is not carrying E-rated loads. Load index is the standardized number behind that: 120/117 is widely shown, with 120 for single-wheel and 117 for dual-wheel positions.

How Much Does The Specific Model Change The Spec?

A lot. Current listings show different tread depths, weights, and speed ratings even when load index and load range match. Speed rating is the clearest split: some tires are rated R (106 mph), others Q (99 mph).

Every one runs load range E at 80 psi max. Differences sit in tread, weight, and speed ceiling. Shopping for a set? Our breakdown of the best 235/80R17 tires tested for towing and daily driving compares current options on wear, noise, and load behavior.

What Should You Check Before Buying?

Don’t buy by size alone — confirm load index, load range, speed rating, and whether the tire is LT or passenger-metric against your vehicle’s requirements. The door-jamb placard lists the minimum load and inflation your truck was built for. Match or exceed those numbers, and never go below them for towing or hauling. Rim width matters too: if your wheels sit outside a model’s approved range, the tire wears unevenly regardless of load rating. TireSize maintains a reference page for the 235/80R17 size specifications to check against a model’s data.

• Match load index and load range to the door placard.
• Confirm the speed rating suits how you drive.
• Verify approved rim width for the exact model.
• Check the LT designation if the truck calls for it.

Get those right and the size code stops being a mystery. Get them wrong and an identical-looking tire can leave you under-rated for the load you’re carrying.