37X13.50R17LT Tire Size

All You Need to Know About 37X13.50R17LT Tires

A 37X13.50R17LT tire is the Light Truck-rated version of the wide 37-inch radial flotation size. It shares the same nominal 37-inch diameter and 13.5-inch width as the standard 37X13.50R17, but the LT designation signals a different casing construction - one built specifically to carry higher loads, support towing, and withstand the structural demands of hard off-road use. The LT suffix is not a marketing category; it defines the casing's ply count, maximum inflation pressure, and load capacity under TRA Light Truck service standards. For the bias-ply version of this size, see 37x13.50-17 guide.

37X13.50R17LT Size Quick Specs

The specifications below reflect the 37X13.50R17LT size class. Load range availability and specific load/inflation figures vary between tire models; always consult the individual tire's published load/inflation table.

What LT Means on 37X13.50R17LT

The "LT" suffix on 37X13.50R17LT identifies this tire as a Light Truck service tire under TRA and DOT classification. Compared with a standard flotation 37X13.50R17, an LT-designated tire in the same nominal size is built with a heavier casing that supports greater loads and tolerates higher inflation pressures. The specific construction differences that accompany the LT designation in 37X13.50R17LT include:

• A stronger, stiffer casing with more ply layers - Load Range D carries 8-ply equivalent reinforcement; Load Range E carries 10-ply equivalent
• Higher rated maximum inflation pressure - LT tires in this size typically operate at higher PSI ceilings than standard flotation equivalents, which increases load capacity but also makes the tire firmer at the same inflation level
• Higher per-tire load capacity - relevant when the vehicle carries significant payload, armor, roof platforms, recovery gear, or tows a trailer
• Greater sidewall puncture resistance - the additional ply layers reduce the likelihood of sidewall damage on rock edges and sharp debris
• Heavier construction - 37X13.50R17LT tires are typically 5–15 lbs heavier per tire than a standard flotation 37X13.50R17, which adds rotating and unsprung mass. Learn more about what makes L Tires different from P-metric tires in our dedicated guide. 

37X13.50R17LT vs 37X13.50R17: What Changes With LT

The table below compares 37X13.50R17LT against the standard flotation 37X13.50R17 - two tires with identical nominal dimensions but different service category and casing construction.

37X13.50R17LT vs 37X12.50R17LT : Width Difference

Both 37X12.50R17LT and 37X13.50R17LT are LT-rated radial flotation tires on 17-inch wheels in the 37-inch diameter class, differing only in section width.

The 37X13.50R17LT is one inch wider in section than the 37X12.50R17LT. Because both carry the LT designation, the fitment considerations are the same as for any 13.5-inch section width tire: wheel offset, fender clearance, and steering lock clearance all require more careful attention than with the narrower 12.5-inch equivalent.