Trailer Tires.
ST-Rated.
Built to Tow.
Small bias ply, semi-steel, and all-steel radial trailer tires - purpose-built for boat trailers, utility trailers, RV trailers, and cargo haulers. Cargomax, Haida, Radar, Carlisle, and Rovelo in stock at Prince Tires Calgary. Supply same day, full size range.
Small Trailer Tires
Economy bias ply trailer tires for light-duty applications - jet ski trailers, small utility trailers, boat trailers, and pop-up campers. Bias ply construction uses diagonal nylon or polyester cords that create stiffer, more puncture-resistant sidewalls. The ideal choice for infrequent towing, rough terrain access roads, or trailers that do not travel at high speeds on Alberta highways.
Semi-Steel Trailer Tires
Semi-steel (bias belted) trailer tires combine the stiffer sidewall of bias ply construction with steel belt reinforcement for added stability. A strong mid-range option for regular towing on Alberta highways - better highway tracking and handling than basic bias ply, at a price point below full all-steel radials. Popular for boat trailers, cargo trailers, and toy haulers that travel regularly on paved roads.
All-Steel Radial Tires
Premium all-steel radial trailer tires are the top choice for RV trailers, fifth wheels, and heavy cargo haulers that regularly travel Alberta and Trans-Canada highways. Multiple overlapping steel belts provide superior cornering stability, less trailer sway, smoother ride, and better fuel economy versus bias ply. Run cooler at highway speeds - reducing blowout risk on long Calgary to Banff or Edmonton hauls. Available in heavy-duty Load Range G and H for maximum payloads.
Understanding ST Trailer Tires
ST (Special Trailer) tires are purpose-built for trailers - not trucks, not cars. Using the wrong tire type on a trailer is one of the most common causes of blowouts and trailer sway accidents on Alberta highways. Here is what you need to know.
ST tires carry 10% more load than LT tires and 40% more than passenger tires at the same size. Their reinforced, stiffer sidewalls actively resist trailer sway - which passenger and LT tires cannot do. Never use P or LT tires on a trailer axle.
Bias Ply: Diagonal nylon cords. Stiffer, puncture-resistant, lower cost. Best for rough terrain and short hauls.
Semi-Steel: Bias with steel belts added. Better highway tracking. Mid-range option.
All-Steel Radial: Full steel belts. Smoothest ride, best highway stability, runs coolest. Recommended for RVs and long haul Alberta driving.
All ST tires are rated for a maximum 75 mph (120 km/h) - do not exceed this on Alberta highways. Always inflate to the maximum sidewall pressure listed. ST tires require higher pressure than LT tires to achieve their rated load capacity. Under-inflation is the #1 cause of trailer tire blowouts.
Load Range Guide - ST225/75R15
| Load Range | Ply Rating | Max Load Per Tire | Max PSI | Typical Use |
|---|---|---|---|---|
| C | 6-ply | 1,760 lbs (800 kg) | 50 psi | Small/light trailers, jet ski, low load |
| D | 8-ply | 2,040 lbs (925 kg) | 65 psi | Mid-size boat trailers, utility trailers |
| E | 10-ply | 2,830 lbs (1,285 kg) | 80 psi | Most common - cargo, boat, pop-up camper |
| F | 12-ply | 3,195 lbs (1,450 kg) | 95 psi | Heavy cargo and larger travel trailers |
| G | 14-ply | 3,750 lbs (1,702 kg) | 110 psi | 5th wheels, large RV trailers, heavy haul |
Featured Brands
We carry trailer tires from trusted brands - from value economy options to premium heavy-duty all-steel radials for RV and commercial applications.
Calgary Trailer Tire Questions
What does ST mean on a trailer tire?
What is the difference between bias ply and all-steel radial trailer tires?
What load range do I need for my trailer?
What size trailer tires do I need?
How often should I replace trailer tires?
Need Help Choosing?
Bring your trailer in or call with your GVWR and trailer type - our Calgary team will recommend the right ST size, load range, and construction type for your specific application.
Trailer Tires.
Same Day Calgary.
ST bias ply, semi-steel, or all-steel radial - we have your trailer tire size in stock. Call ahead or walk in.