TIRE CENTER · Trailers & towing
Trailer tire basics
Start with the trailer’s requirements
Find the trailer manufacturer’s tire-information label (placard) and certification information. These give tire/pressure and vehicle/axle requirements for this trailer.
Trailer: compare label and tire
Tire type is part of suitability
Read the application designation
Use product and application guidance
ST tires are for trailer service, not passenger-vehicle substitution; some trailers specify approved LT tires. Pressure, stiffness, wear and life depend on the actual product and application.
There is no universal trailer PSI or 65-mph tire limit. Follow actual product and application ratings.
Speedy J’s recommends replacing trailer tires every 3 years from the tire’s manufacture date.
A trailer tire may require replacement sooner because of tread wear, cracking/weathering, damage, impact, improper inflation, overloading, exposed cords, a structural bulge / impact break, abnormal wear or other condition/application concerns. Age alone does not make a trailer tire safe or serviceable until three years; applicable manufacturer and application requirements still apply.
Before trips, check cold pressures, tread/damage and the spare where applicable.
Sources and Technical Notes
Technical concepts reviewed 2026-10-11. Actual application instructions remain controlling.
- Dexter: trailer running gear service manual, wheels/tires, ratings and maintenance (opens in a new tab)
- Goodyear: Endurance N-rated trailer tire introduction (opens in a new tab)
- USTMA: replacing tires (opens in a new tab)
Application-specific details and scope
Goodyear’s N-rated Endurance example demonstrates why a universal 65-mph ST limit is inaccurate; use the actual product’s rating. ST tires are intended for non-driven trailer-axle service. Stiffness, pressure, wear and durability vary by product and application, rather than forming a basic/better/best category ranking.
The three-year trailer replacement interval is Speedy J’s service recommendation, not a universal federal law or a claim that every tire manufacturer mandates the same interval.