C rated, are suffering from peripheral cracking around the wall near the wheel rims. And worse still affecting the inner walls.
Outer wall

Inner wall

M
As we tow a lightweight caravan l decided this was not acceptable and checked out a couple of used Hifly 2000 spare tyres/wheels sitting in the garage.
To my amazement the Hifly's had no cracking whatsoever. Yet the Avon's are dated 2017 and the Hifly's 2014.
Talking to a technician at Watling Tyres l mention the above. His reply is a bit of an eye opener. He claims tyre wall cracks develop due to the weight of the vehicle and lack of movement. If the tyre doesnt warm by driving then the oils inside the carcass of the tyre will dry up and develop cracks. So driving your pride and joy regularly helps keep the tyres healthy.
Im a bit skeptical about his view. But one thing for certain. I wont be splashing out big money on Avon tyres again!