Trailer Tires
Special Trailer tires carry an ST prefix and they are built for a job no passenger tire is designed to do. A trailer tire does not steer and does not transmit power. What it does is carry a heavy vertical load and resist lateral sway, so ST tires use much stiffer sidewalls than a passenger or light truck tire of the same size. That stiffness is what keeps a trailer tracking straight behind the tow vehicle instead of swaying.
Never fit passenger or LT tires to a trailer as a substitute. The softer sidewall flexes under the trailer load, which increases sway and builds heat, and heat is what destroys trailer tires. Most trailer tire failures are heat failures caused by underinflation or overloading rather than by road hazards.
Trailer tire rules that prevent blowouts:
Always inflate to the maximum pressure listed on the tire sidewall, not to a comfort pressureCheck pressure cold before every trip, since a trailer sits for weeks and loses airRespect the speed rating; many ST tires are rated to 65 mph and running faster builds fatal heatReplace on age, not just tread depth. Trailer tires typically age out at 3 to 5 years regardless of milesMatch load range to your loaded trailer weight with margin, and never round down
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Before you buy
Trailer Tires: the questions people ask
How do I read a tire size?
Metric sizes give section width in millimetres, then aspect ratio as a percentage of that width, then rim diameter in inches. So 275/60R20 is 275mm wide with a sidewall 60 percent of 275mm tall on a 20 inch wheel. Flotation sizes are simpler: 35x12.50R20 is 35 inches tall and 12.5 inches wide on a 20 inch wheel. Every listing here also publishes the overall diameter worked out for you.
Will a bigger size fit without a lift?
Usually one size up over stock clears on a half ton truck with a leveling kit. Going from a 33 inch to a 35 inch tire almost always needs a leveling kit plus trimming at the front bumper corners. 37 inch tires need a real lift and normally a re-gear to get the drivability back.
What do load index and speed rating mean?
Load index is the weight one tire carries at its rated pressure. Speed rating is the sustained speed it is certified for. Never fit a tire with a lower load index than the placard in your driver door jamb calls for. On a truck that tows, going under the placard rating is the commonest cause of a tire failing under load.
Do tires arrive mounted?
Loose tires ship on their own and need a local shop to mount and balance them. Wheel and tire packages ship mounted, balanced and ready to bolt on.
How fast do orders ship?
Orders ship from a United States warehouse, normally within 1 to 3 business days of clearing. Orders over $199 ship free, and below that a flat rate is shown at checkout before you pay. Tracking is emailed as soon as the shipment is created.
What can I return?
Unmounted, uninstalled parts in original packaging can be returned within 30 days. A wheel that has had a tire mounted on it, and a tire that has been fitted, cannot be returned because neither is new any more. That is why we check the fitment data on every order against the vehicle you give us before it ships.
Can someone check fitment for me before I order?
Yes, and it costs nothing. Send us the year, make, model, trim and what is on the vehicle now, and we will tell you what fits, what will rub and what it takes to clear.
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