When it comes to trailers, the tyres are the unsung heroes that bear the weight and ensure smooth travel. If you own a trailer equipped with 4.80 400 x 8 tyres, knowing when and how to replace them is crucial for safety and performance. In this comprehensive guide, we'll walk you through everything you need to know about replacing your 4.80 400 x 8 trailer tyres, ensuring a hassle-free experience and optimal performance.

Understanding 4.80 400 x 8 Tyres

The notation '4.80 400 x 8' refers to the tyre's size and specifications. Here's what each part of the notation means:

  • 4.80: This indicates the tyre's width in inches. In this case, the tyre has a width of 4.80 inches.
  • 400: This represents the tyre's load index, indicating its maximum load capacity. A higher number indicates a higher load capacity.
  • 8: This denotes the tyre's rim diameter in inches. In this case, the tyre is designed to fit an 8-inch rim.

Signs That It's Time to Replace Your Tyres

  1. Tread Wear: Inspect the tread depth of your trailer tyres regularly. Worn-out treads indicate reduced traction and increased risk of skidding, especially in wet or slippery conditions.
  2. Cracks or Cuts: Check the sidewalls of your tyres for any signs of cracks, cuts, or bulges. Damaged sidewalls compromise tyre integrity and increase the risk of blowouts.
  3. Age: Even if your tyres appear to have sufficient tread depth, consider replacing them if they are more than six years old. Over time, rubber compounds degrade, reducing tyre performance and safety.
  4. Uneven Wear: Uneven tread wear patterns indicate alignment issues or improper inflation. Address these issues promptly and consider replacing the tyres if the wear is significant.

Steps to Replace Your Tyres

  1. Choose the Right Tyres: When selecting replacement tyres, ensure they match the size and specifications of your existing tyres (4.80 400 x 8). Additionally, consider factors such as load capacity, tyre construction, and tread pattern to meet your specific needs.
  2. Prepare Your Trailer: Safely raise your trailer using jack stands and remove the lug nuts securing the old tyres. Carefully remove the old tyres from the rims using tyre irons or a tyre changer.
  3. Mount the New Tyres: Align the new tyres with the rims and carefully seat them in place. Use a tyre mounting lubricant to ease installation if necessary. Secure the tyres to the rims with lug nuts, tightening them in a star pattern to ensure even pressure.
  4. Check Inflation and Alignment: Inflate the new tyres to the recommended pressure specified by the manufacturer. Inspect the tyres for proper alignment and adjust as needed to prevent uneven wear.
  5. Perform a Test Drive: Before hitting the road, conduct a brief test drive to ensure the tyres are installed correctly and perform as expected. Pay attention to handling, steering response, and any unusual vibrations or noises.


Replacing your 4.80 400 x 8 trailer tyres is a straightforward process that can significantly enhance safety and performance. By understanding the signs of tyre wear, selecting the right replacement tyres, and following proper installation procedures, you can ensure smooth travels and peace of mind on the road.

For a wide selection of high-quality trailer tyres and replacement parts, visit Castors-Online.co.uk and get ready to hit the road with confidence.