I have a freind that runs Chen Shin's, He has them siped or sipes them himself? Swears by them. I put one on the back of my G-5 to get home to Spokane on, {it was a Sunday in Denver} I had found a tread separation on the Avon Roadrunner. The tire was over half worn out and Avon gave me a new tire & tube for it, mounted. That was when Big Jim from Seattle was pictured in their advertisment.For you young peoples info he rode a Guzzi. Ron