Tire cracks

I have cracks running between the two innermost treads on all four tires.They are in the middle of the water channel. What caused this? The car is only one and a half year old but it sat at dealer for about a year. Is it safe or should I replace them?

You are good. You don’t want to have sidewall cracks however.

The process of tires aging involves a certain amount of cracking. It’s a matter of degree.

You should have someone look at them.

you could check the age of your tires…http://www.tirerack.com/tires/tiretech/techpage.jsp?techid=11
perhaps they are older than three years…