Manufacturers warranty does not cover tyres, the tyre manufacturer does.

Had a BMW fitted with Michelins. At 4 years old they were badly cracked on the sidewalls but it passed MOT at BMW garage with advisory. Spoke to Michelin (in Birmingham) who said the tyres were covered up to 6 years from the date code on the sidewall (the tyres were actually 4 1/2 years old). They advised that I go the ATS who would replace them at my expense and return them to Michelin for inspection. If they were faulty I would get an allowance for tread remaining. Asked if I could simply put the all season tyres/rims on the car I used in winter and get ATS to just remove the tyres and return them and then if they were faulty replace at my leisure, they said fine.

So after we returned form holiday (in our other car) I swapped the rims and off the ATS. They removed the tyres and sent them back (FOC) and after 2 weeks got a letter from Michelin telling me the tyres were faulty and a cheque for just over £190 was in the post. The following spring I got a set of mid range tyres fitted for about £230.

So speak to the tyre manufacturer.

OK thanks. AC have already admitted the tyres are definitely defective and so it is a case of how I get decent tyres. They do have a video showing why the tyres are out of shape which I hope to obtain. The car is a year old and done 13,000 miles so I will argue my case whilst also speaking with Toyo about the guarantee they offer and how this could work in this situation.