Trailer Tire Wheel Assembly ST185/80R13 8-Ply D 99N 5 Lug on 4.5in

In this review of the Trailer Tire Wheel Assembly ST185/80R13, the verdict is straightforward: this set of two assemblies is aimed at trailer owners who prioritize safety and longevity over lowest upfront cost. The most compelling reason to consider these is the full nylon cap ply overlay that runs across the entire tread area, a safety-focused feature that goes beyond the partial shoulder strips common on many budget tires. For anyone hauling cargo regularly and wanting a rugged, serviceable wheel and tire ready to meet DOT standards, this assembly is worth a close look.

Key Features

• Full nylon cap ply: Provides enhanced tread integrity and resistance to separation compared with tires that only have shoulder strips, improving long-term safety under load.
• Scuff Guard ring: Adds protection to the tire sidewall and rim area, helping reduce cosmetic and structural damage from trailer movement and loading.
• 7mm tread depth: Deeper tread than many competitors for increased mileage life and better wear performance over time.
• 8-ply, load range D: Rated to handle heavier trailer loads with a Load Index of 99, making it suitable for medium-duty hauling tasks.
• 5 lug on 4.5 in bolt pattern: The white spoke steel wheel with zero offset fits common small trailer hubs and provides a simple, serviceable mounting solution.
• DOT safety certified: Meets or exceeds applicable DOT standards so it is compliant for road use and seasonal hauling.

Who It's For

The assembly is best for small to medium trailer owners who tow regularly with moderate loads and want a tire designed for durability and a safety-focused construction. It fits trailers using a 5 lug on 4.5 in PCD pattern and a 13 in rim, so it is well suited to utility trailers, boat trailers, and small cargo trailers where reliability matters.

Those who shop strictly on price or need ultra-high speed or specialty tires should look elsewhere; the N speed rating limits top speeds to 88 mph and the design targets load capacity and durability rather than sportier handling or highway performance beyond its rating.

Pros & Cons

Pros

• Robust safety feature with full nylon cap ply across the tread for improved structural integrity.
• Deeper 7mm tread for longer wear and better mileage life compared with cheaper alternatives.
• Wheel and tire sold as a matched assembly with a common 5 lug 4.5 in bolt pattern for easy installation.
• Visible value and quality in customer feedback, with many mentioning overall look and reliability.

Cons

• Paint quality on the white spoke wheel receives mixed feedback, so cosmetic finish may vary between units.
• Speed rating N limits applications where sustained higher speeds are required.

Specifications

Tire Size	ST185/80R13
Ply Rating	8 (Load Range D)
Load Index	99
Speed Rating	N (up to 88 mph)
Tread Depth	7 mm
Wheel Bolt Pattern	5 lug on 4.5 in PCD
Wheel Style	White Spoke, offset 0

Our Verdict

For trailer owners who need dependable load capacity and a tire built with safety-first construction, this assembly is a solid value. The full nylon cap ply, deeper tread and DOT compliance make it a reliable choice for regular hauling, and the matched white spoke wheel keeps fitment simple. It is recommended when durability and safety matter more than top speed or cosmetic perfection.

Frequently Asked Questions

Are these assemblies ready to mount on a trailer?
Yes; the assemblies include the wheel and tire with a 5 lug on 4.5 in bolt pattern and are ready to be mounted on compatible hubs.

What kind of loads can these tires handle?
They are 8-ply rated, Load Range D with a Load Index of 99, designed for medium-duty trailer loads within the tire's rated limits.

How fast can these tires safely go?
The speed rating is N, which is up to 88 mph, so they are suitable for normal trailer towing within that limit.