I have started to have numerous small problems with my Honda commercial (21"s) I am wondering if I am just having some bad luck or if it is time to turn them. I have had the oldest for close to 7 years (yes, it is time to turn that one) the other 2 are 4 and 5 years old. I figured somewhere around 5 years, but now I am wishing I had started around 4 and just did one a year. I think it was a poor decision on my part. What is your expierence with them and how soon would you turn them? Would you use a different brand? I love hondas (21's anyway) they are built like tanks, but as heavy as a dadburn tank too.