By Wright-Way Trailers
Introduction: The Maintenance Item Most Trailer Owners Skip
Trailer tires don't get nearly the attention car tires do, and that's exactly why they cause so many roadside problems. If your trailer only comes out a handful of times a year, it's easy to assume the tires are fine as long as the tread looks okay. That assumption is one of the most common reasons trailer tires fail — often at highway speed, with a heavy load behind you.
Here's what actually determines when to replace, how to inflate, and whether rotation matters for trailer tires specifically, since the rules are different from the tires on your truck.
The Short Answer: Trailer Tires Age Out Before They Wear Out
Most trailer tires are ST-rated (Special Trailer), and industry guidance generally recommends replacing them every 3 to 5 years regardless of remaining tread depth, since UV exposure, weather, and long periods sitting loaded in one spot dry out and weaken the rubber from the inside long before the tread wears down. ST-rated tires also typically carry a maximum speed rating of 65 mph — towing faster than that, especially with a heavy load, significantly increases the risk of a blowout from heat buildup.
Why Trailer Tires Are Different From Vehicle Tires
Trailer tires are built with stiffer sidewalls than passenger vehicle tires, designed to resist swaying under load rather than provide a cushioned ride. That stiffness makes them more prone to heat buildup and, ultimately, age-related failure. Combined with the fact that many trailers sit unused for weeks or months between trips, this is why a trailer tire with plenty of visible tread can still be far more dangerous than it looks.
Experience: What We See When Trailers Come in for Service
When trailers come into our shop, tire age is one of the most common surprises for owners. A trailer that's only towed a few times a year can still have five- or six-year-old tires with tread that looks perfectly fine — and those are often the ones we recommend replacing before a customer heads out on a longer trip. Underinflation is the other big one we catch regularly: a soft-looking tire builds heat fast once it's rolling at highway speed under a loaded trailer, and that heat is what leads to a blowout.
Signs Your Trailer Tires Need Attention
- Cracking or "weather checking" on the sidewall — small cracks in the rubber are a clear sign of age-related deterioration, even with good tread.
- Uneven or unusual wear patterns — can indicate improper inflation, alignment, or a bent axle.
- Bulges or soft spots — a sign of internal structural damage that can lead to sudden failure.
- Tires over 5 years old — check the DOT date code on the sidewall; age alone is a real risk factor regardless of tread.
- Visibly low or soft tires before a trip — always check pressure cold, before towing, not after the tires have warmed up.
How to Check a Trailer Tire's Age
Every tire has a DOT code on the sidewall ending in four digits — the first two indicate the week of manufacture, the last two indicate the year. A code ending in "2321," for example, means the tire was made in the 23rd week of 2021. This is the most reliable way to know a tire's true age, since tread condition alone doesn't tell the full story.
Trailer Tire Maintenance Checklist
- Check pressure before every trip, when tires are cold, and inflate to the PSI listed on the tire's sidewall — not a guess.
- Inspect for cracking and bulges at each check, especially after the trailer has sat unused for a while.
- Check the DOT date code and plan on replacement in the 3-to-5-year range regardless of tread.
- Don't exceed the tire's speed rating, which is typically 65 mph for ST-rated trailer tires.
- Use a cover or park in shade when possible to reduce UV exposure during long periods of storage.
- Carry a properly inflated spare, since trailer tire failures often happen far from a service station.
Do Trailer Tires Need to Be Rotated?
Rotation matters less on trailers than on vehicles, since trailer tires aren't driven or steered the way vehicle tires are. That said, on multi-axle trailers, tires can wear unevenly between axles, so periodically swapping position front-to-back can help even out wear over the tire's life. It's a lower priority than pressure checks and age monitoring, but worth doing during a service visit.
What Our Customers Say
[REPLACE WITH REAL CUSTOMER REVIEW — paste a genuine testimonial from a real Wright-Way customer, ideally one that mentions catching a tire issue before a trip or a helpful service visit. Keep it authentic for trust and FTC compliance.]
Why Trailer Owners Trust Wright-Way's Service Department
We check tire age and condition on every service visit, not just tread depth, because that's what actually predicts whether a tire makes it through the season. If your trailer tires are due, we'll tell you honestly rather than wait for a roadside surprise to make the decision for you.
Frequently Asked Questions
How often should trailer tires be replaced?
Generally every 3 to 5 years regardless of tread depth, since age and UV exposure weaken trailer tires well before the tread wears down.
What PSI should trailer tires be?
Always inflate to the pressure listed on the tire's own sidewall, checked when the tires are cold, before towing.
How fast can you tow with ST-rated trailer tires?
Most ST-rated trailer tires carry a maximum speed rating of 65 mph; towing faster increases heat buildup and blowout risk.
Do trailer tires need to be rotated like car tires?
It's less critical than on vehicles, but periodic rotation on multi-axle trailers can help even out wear between axles over time.
Not sure how old your trailer tires actually are? Stop by Wright-Way Trailers for a quick inspection — we'll check the date codes and let you know exactly where you stand.