SPRINT CLASSIC

Fitted to an original 1956 beetle that is lightly used and garaged. After 12 years the inside of the sidewall is cracking on all tyres yet the outside and tread blocks are still like new. Vredestein were contacted. They asked for photos then said that due to age blah blah blah couldn't do anything. For low speed tyres looked after it is very odd that the protected inside sidewall is cracking, as reported by other drivers. This suggests a material/manufacturing fault. Old tyres crack on the outside and around the tread blocks. In use these tyres were very good all round, though not as good as a set of Michelin XZX I bought in 1981 that lasted 23 years without cracking.

I put on the TR6 four and a spare new tyres 165/80x15 HR prior to re registering as a Historic Vehicle here in Spain in 2017. Since the completed restoration in 2017 it has travelled minimum mileage approximately 7,000 Kms about 4,500 miles. I had occasion the take the wheels off the car to clean them and the tyres, to keep the same appearance as the rest of the car and noticed to my dismay and worry that nearly all the road tyres were showing signs of cracking around the inside wall of the tyres..They are correctly looked after wheel covers on the tyres increased tyre pressures on lay up thought the TR is used on average once a month.
I have notified both the On-line sellers 1001Nuematicos but they have not responded at all. Vredestein are burying their head in the sand. I have also sent photos of the tyres.to them both I wouldn't deal with either of them again.
Why should I have to buy new tyres after 5 years?