I have the worst luck with the caster wheels on my Exmark ZTR. They always go flat or debead on me. I must have broke both of them down at least 5-6 times this year and cleaned the rim lip and cake bead sealer on them and they still go flat after about a week. I was thinking about getting the "no flat" tires by Advanced Supply for next year. Anyone running air less tires? What are they like and are they worth the price?