Choosing the Right Trailer Tires
For smaller trailers under 20 feet, radial trailer tires are often the best choice. They typically provide a smoother ride for lighter loads, though they may bounce on rougher road conditions. One drawback is the risk of steel belt damage to the trailer if a tread blowout occurs. Larger trailers (21–40 feet) weighing 10,000 pounds or more benefit from bias trailer tires. Thanks to their thicker sidewalls, they handle heavy loads more effectively. While older bias tires were known for hard rides and flat spots, modern versions are greatly improved. For heavy trailers, bias tires can provide a smoother ride, quicker acceleration, less bounce, longer coasting with less road drag, and even up to one additional mile per gallon in fuel efficiency. Bias tires also allow for the use of Port-O-Wall white wall inserts, which cannot be used with radials.
Radial vs. Bias at a Glance
Radial Trailer Tires
- Best for small/light trailers under 20’
- Smoother ride but may bounce on rough roads
- Risk of steel belt damage if a tread blowout occurs
Bias Trailer Tires - Best for large/heavy trailers 21–40’ and 10,000+ lbs
- Stronger sidewalls handle heavy loads better
- Modern versions ride smoother than older styles
- Improved fuel efficiency and reduced bounce
- Compatible with Port-O-Wall white wall inserts
Always Use Trailer-Rated Tires
Automotive tires should never be used on trailers. Car tires are not built to withstand the sidewall pressures trailers experience. With so many trailer-rated options available, there’s no reason to use automotive tires—even on the smallest trailers.
White Wall Options
White wall tires are a popular upgrade for vintage style, but quality varies.
- Tire Paint: Labor intensive and ultimately not durable; tends to discolor and flake after road use.
- Grinding Tires: Unsafe and not recommended; weakens tires and voids warranties.
- Port-O-Wall Inserts: Work only with bias tires; more expensive versions perform better, but results vary. A decent option for trailers that aren’t towed often.
- True Trailer-Rated White Wall Tires: The most reliable and low-maintenance option, though the most expensive. Check with: https://www.millertire.com/
Tire Storage and Care
Whenever a trailer is stored for an extended period, avoid leaving tires directly on dirt, grass, asphalt, or concrete. Place a board, rubber mat, or sheet of aluminum under the tires instead. When stored outdoors, use tire covers to protect them from UV rays.
Replacement Timeline
A good safety rule is to replace trailer tires every 4–6 years, regardless of tread wear. Tires deteriorate even when not in use. Radial tires should generally be replaced every 4–5 years, while bias tires can last 5–6 years.
Split Rims
Split ring rims are best avoided. They are considered unsafe compared to modern rims and can be difficult to service on the road, as many tire shops no longer work on them. Replacing split rims with modern styles does not reduce the value of a vintage trailer and makes finding help during a roadside emergency much easier.
