Tyres are a critical part of the overall safety and performance of any trailer and are just as important as the tyres on your everyday vehicle. Whether you’re towing a horsebox, a flatbed laden with tools, or a caravan packed for a weekend away, those four contact points with the road are doing a lot of heavy lifting.
Trailers, by their nature, are built to carry heavy loads. That load, however, isn’t evenly distributed across the trailer frame alone – ultimately it ends up bearing down on the tyres. And unlike car tyres, trailer-specific tyres are engineered to support this pressure with reinforced sidewalls and stiffer construction. Unlike passenger tyres, they’re not designed for so much for grip as designed to track straight, resist sway and stand up to serious weight. Fitting the wrong type of tyre, for example repurposing a car tyre in place of a proper trailer tyre, can be not just ineffective but actually dangerous.
But even the right tyres will only perform if they’re in the right condition. Just like on a car, trailer tyres need to be regularly checked for pressure, tread depth and wear. The legal minimum tread depth is 1.6mm, but really, once tyres fall below 3mm, their ability to grip the road – especially in wet conditions – diminishes dramatically. A risk not worth taking when checking them doesn’t take long and could prevent a costly or dangerous failure.
One of the most obvious signs of an issue is uneven wear. This could suggest misalignment, suspension problems or even incorrect inflation. Underinflated tyres can lead to heat build-up, increasing the risk of blowouts, while overinflated ones can reduce grip and shorten the life of the tyre. What makes it worse is that trailers are often left standing for long periods, during which time tyres can quietly deteriorate, so cracks in the sidewalls, flat spots, or signs of perishing rubber should all ring alarm bells. These tyres may still look serviceable, but in practice they could fail badly.
It’s also worth remembering that trailer tyres, unlike those on your car, often reach the end of their life due to age, not mileage. UV rays, temperature changes and general exposure to the elements all take their toll over time. That’s why even tyres that appear to have plenty of tread might still be overdue for replacement after five years or more.
Choosing the correct tyre for your trailer also means knowing your load requirements and reading the markings on the tyre itself. Load index, speed rating, ply rating and inflation pressure are all stamped on the sidewall, and they all play a role in keeping you within safe operating limits. Exceeding these limits – either through overloading the trailer or under-inflating the tyres – could result in reduced control, greater braking distances or even a full tyre failure.
Trailer sway is another consideration. This is where the trailer begins to oscillate behind the towing vehicle and is often caused by poorly inflated or mismatched tyres. Good-quality, properly specified trailer tyres are designed to reduce sway with their stiffer construction, offering you greater stability and confidence on the road.
For all these reasons, regular maintenance and inspection of your trailer tyres shouldn’t be an afterthought, it should be part of your standard routine. A thorough visual check, pressure testing with a quality gauge, and rotating or replacing tyres when necessary can save money in the long run and could potentially avoid an accident.
At Cheshire Trailers, we understand just how vital tyre condition is to trailer safety. From agricultural equipment to domestic trailers and horseboxes, our NTTA-trained mechanics inspect, replace and maintain hundreds of trailer tyres – ensuring that every trailer leaving the workshop is safe, compliant, and road-ready.
