What types of tyres are acceptable for Class 5 vehicles with a "C" speed rating, and what specific requirements or restrictions apply to these tyre types and sizes?

For Class 5 vehicles with a "C" speed rating, the acceptable tyre types and sizes can vary depending on the specific requirements set by different regulatory bodies and manufacturers. Here's an overview of common tyre options and associated restrictions:

**Tyre Types:**
- **Radial Tyres:** These are the most commonly used tyres for Class 5 vehicles due to their superior performance, durability, and handling characteristics. Radial-ply tyres offer better traction, especially in wet conditions, and provide a more comfortable ride. They typically feature steel or fabric plies arranged at an angle (usually around 60-80 degrees) to the tyre's circumference.
- **Bias Tyres:** While less common for heavy-duty vehicles like Class 5, bias tyres can be acceptable if specifically approved by the vehicle manufacturer. Bias tyres have a unique construction where the tread and sidewall are made of different materials, typically rubber and fabric or steel, woven at varying angles to provide strength and flexibility.

**Specific Requirements and Restrictions:**
- The "C" speed rating indicates a maximum speed capability of approximately 100 mph (160 km/h). Tyres with this rating should be capable of handling speeds up to this limit while maintaining safety and performance.
- When selecting tyres, it is crucial to consider the vehicle's load capacity and intended use. Class 5 vehicles may have specific recommendations or requirements for tyre size and load index to ensure optimal performance and safety. For example, a vehicle might require larger tyres (e.g., 195/80R22.5) with higher load indices to accommodate heavier loads.
- Always refer to the vehicle's owner's manual and consult with automotive experts or manufacturers to determine the most suitable tyre specifications for your specific Class 5 vehicle model. Different vehicles may have unique requirements due to factors like driving conditions, terrain, and intended use (e.g., commercial, passenger).