ST175/80R13 Trailer Tire Set2 - 6-Ply Load Range C 91M

In this review of the ST175/80R13 Trailer Tire Set2 the bottom line is clear: these ROCKMAN trailer tires are built for users who haul regularly and want a safer, longer-lasting replacement without overspending. The reviewer found the most convincing single reason to buy is the full nylon cap ply overlay across the entire tread area, a meaningful safety upgrade compared with many budget trailer tires that only reinforce the shoulders. For owners of utility trailers, small cargo trailers or boat trailers seeking reliable load capacity and improved tread life, this tire set is worth considering.

Key Features

• Full nylon cap ply: The cap ply runs across the entire tread area to improve heat resistance and reduce tread separation risk for safer towing.
• 7mm tread depth: Deeper tread than many competitors delivers better wear life and more mileage between replacements.
• 6-ply, load range C: A sturdy construction that supports typical utility trailer loads while staying compact and manageable.
• Load index 91: Rated to carry up to 1360lbs per tire, suitable for many common trailer load requirements.
• DOT safety certified: Meets or exceeds applicable standards so users can expect dependable seasonal performance.
• Speed rating M (up to 81mph): Offers a conservative speed capability appropriate for trailer use and highway towing.

Who It's For

This set is best for owners of small to medium utility trailers, landscaping or equipment trailers, and boat trailers who prioritize safety and longer tread life without moving up to heavier commercial tires. The reinforced full cap ply and deeper tread make it a practical choice for frequent haulers and those towing moderate loads within the stated capacity.

Those who need the highest commercial load capacities, specialty off-road trailer tires, or metric passenger car replacements should look elsewhere; this tire is optimized for trailer duty and rated accordingly rather than for passenger-vehicle performance.

Pros & Cons

Pros

• Full nylon cap ply overlay across the tread enhances safety versus tires with shoulder-only strips.
• 7mm tread depth provides noticeably longer wear life than many lower-cost competitors.
• Good value: customers report the tires feel sturdy, fit well, and look solid on trailers.

Cons

• As a trailer-specific tire, it is not a substitute for higher load-rated or specialized commercial tires when heavier capacities are required.

Specifications

Our Verdict

The ST175/80R13 Set2 from ROCKMAN is a practical, value-oriented trailer tire that stands out for its full nylon cap ply and deeper 7mm tread, making it a smart choice for routine hauling where safety and tread life matter. It offers dependable load capacity for most utility trailer needs and represents good value for owners who want a durable replacement without stepping up to heavier commercial tires.

Frequently Asked Questions

Will these tires fit my trailer rim?
These are sized for ST175/80R13 rims; consult your trailer manufacturer or a tire fitter to confirm rim width and fitment for your specific trailer.

How much weight can each tire carry?
Each tire has a load index of 91 and a maximum load of 1360lbs when inflated to the proper pressure.

Are these DOT certified?
Yes, the tires meet or exceed applicable DOT standards for dependable performance.