Because the car is limited use they still look new. I run tire pressure at psi to limit rolling resistance and to help with sidewall flex under hard cornering.
The Sonars SX608's are a great tire for summer driving but winter wet road could be better. When they do break loose, they are predictable and easy to bring the car back into control.
The tires are now 8 years old and still have 92% of their tread left. They still drive as good as the day I fitted them. I'm looking to replace them because of age. There are no signs of cracking or splitting but because the car is rare I can't risk a tire blowout and damaging the car or worse.


