LT235/80R17 Tire Size

All You Need to Know About LT235/80R17 Tires

LT235/80R17 tires share the same external dimensions as standard 235/80R17 sizes but are built using light truck (LT) construction, designed to operate under higher load and pressure conditions. This distinction makes LT235/80R17 suitable for towing, hauling, and commercial-duty applications where structural strength and load stability are critical.

With a width of 235 mm, an 80% aspect ratio, and a 17-inch wheel diameter, LT235/80R17 produces an overall diameter of approximately 31.8 inches and a sidewall height of about 7.40 inches. These measurements define its physical footprint, but performance characteristics depend heavily on load range and inflation capacity rather than size alone.

Compared with a standard 235/80R17, the LT version is engineered with reinforced internal construction to support higher air pressure, typically up to 80 psi in Load Range E configurations. That increased pressure capability allows the tire to carry significantly more weight without excessive deformation under load.

LT235/80R17 Size Quick Specs

• Approved rim width range: 6.0–8.0"
• Width: 235 mm
• Sidewall height: 188.00 mm
• Overall diameter: 31.81" (≈ 31.8")
• Wheel diameter: 17 in

Note: While LT235/80R17 maintains the same calculated dimensions as non-LT versions, the actual mounted diameter can vary slightly depending on tread depth and casing design. Load range and inflation pressure influence how the tire behaves under weight more than they affect its unloaded dimensions.

On LT235/80R17, rim width within the approved 6.0–8.0" range affects not just sidewall shape but how load is distributed across the contact patch - a factor that matters more on a working truck tire than on a passenger size. See how rim width interacts with load behavior.

What LT Means in LT235/80R17

The “LT” designation indicates light truck construction, which differs from passenger (P-metric) tires in both structure and operating pressure. LT235/80R17 tires use stronger internal plies and reinforced sidewalls, allowing them to maintain shape under heavier loads.

This construction enables higher inflation pressure, typically ranging from 50 to 80 psi, depending on load range. As a result, LT235/80R17 tires can carry substantially more weight per tire compared to passenger versions of the same size.

The trade-off is reduced sidewall compliance. Under light load, LT tires can feel firmer because the stiffer casing resists deformation, while under heavy load, that same stiffness maintains stability and prevents excessive heat buildup.

LT235/80R17 Load Capacity and Pressure Behavior

In LT235/80R17, load capacity is directly tied to load range and inflation pressure rather than size alone. A Load Range E version typically operates at up to 80 psi and can support over 3,000 lbs per tire, depending on the specific model.

This is a key difference from standard 235/80R17 tires, which are built for lower pressure and lighter-duty use. Even though both share the same diameter and width, their ability to carry weight and resist deformation under load is not equivalent.

LT235/80R17 Common Vehicle Applications

LT235/80R17 is most commonly used on heavy-duty pickup trucks and commercial platforms where load demand exceeds standard passenger tire capability. Typical applications include:

• Ram 3500 (dual rear wheel configurations)
• GMC Sierra 3500HD (dually setups)
• Ford F-250 and F-350 (towing and payload-focused configurations)

On these vehicles, LT construction is not optional; it is required to safely handle towing loads, cargo weight, and sustained highway stress. Selecting a non-LT tire in these applications can result in insufficient load capacity even if the size appears correct.

LT235/80R17 Dimensions in Inches

LT235/80R17 measures approximately 9.25 inches in width, 31.81 inches in overall diameter, and 7.40 inches in sidewall height.

The large LT235/80R17 sidewall contributes to impact absorption and load distribution, particularly under uneven weight conditions such as towing. At the same time, the reinforced LT casing limits excessive deformation, maintaining consistent contact with the road surface under heavy load.

LT235/80R17 in Inches: All Measurements

• Overall diameter: 31.81" (≈ 31.8")
• Width: 9.25"
• Sidewall height: 7.40"
• Wheel diameter: 17"
• Circumference: 99.92" (≈ 99.9")

LT235/80R17 vs 235/80R17 (Standard) Tires

Although LT235/80R17 and standard 235/80R17 share identical external dimensions, their performance characteristics differ significantly due to construction and pressure capability.

• Dimensions: identical (≈31.8" diameter)
• Load capacity: LT version is significantly higher
• Inflation pressure: LT supports much higher psi
• Sidewall behavior: LT is stiffer and more load-stable

This means LT235/80R17 and 235/80R1 are not interchangeable in heavy-duty use. While a standard 235/80R17 may physically fit, it may not meet the required load rating for towing or payload conditions.

Comparison of LT235/80R17 With Close LT Tire Sizes

Within heavy-duty 17-inch tire options, the LT235/80R17 sits among taller, load-focused sizes. The closest comparisons include LT235/75R17 as a slightly shorter alternative and LT245/75R17 as a wider option with a similar overall diameter.

LT235/80R17 vs LT235/75R17

• Width: identical at 235 mm
• Overall diameter: LT235/75R17 is ≈0.94 inches (≈3.0%) smaller

This difference sits at the upper edge of the ±3% threshold. In LT applications, where towing load and axle weight are critical, even this reduction in diameter increases revolutions per mile and can affect gearing, load distribution, and stability under sustained load.

LT235/80R17 vs LT245/75R17

• Width: LT245/75R17 is 10 mm wider
• Overall diameter: ≈0.35 inches (≈1.1%) smaller

Because the diameter difference remains within the ±3% range, LT245/75R17 and LT235/75R17 sizes are generally compatible from a rolling standpoint. However, the increased width affects clearance and load distribution, particularly on dual rear wheel setups, and must be verified against rim width and vehicle specifications.

In LT235/80R17 applications, where load rating, inflation pressure, and construction type are as important as diameter, the ±3% rule is only one part of the evaluation. Additional factors such as load index, pressure requirements, and axle configuration must also be confirmed before replacing a truck tire size.

When to Choose LT235/80R17 Tires

LT235/80R17 should be selected when the vehicle regularly operates under high load conditions, including towing, hauling, or commercial use. In these scenarios, load capacity and pressure resistance matter more than ride comfort.

For lighter-duty use, a standard 235/80R17 may provide a more compliant ride, but it should only be used if it meets the vehicle’s load requirements. Matching or exceeding the original equipment load rating remains essential regardless of tire type.