I bought a new 18/44 FZ earlier this spring and I love the way it cuts. I'm running doubles with a set of Gators over the stock blades and have had no problems with clumps or missed cuts. Thinking about a mulch kit for the fall leaves but I think I'll wait and see how it handles my leaves (I live in the middle of a woods). Here is my problem. The last two times I've mowed I've had one of the front caster tires break the tire bead and go flat. Get this, once on the left and once on the right. After the first time, I remounted the tire and made sure both were inflated to 9 psi and continued mowing. The next time I mowed, it happened almost immediately after I started mowing. I was mowing around a tree trunk on level ground and I looked down and the tire was flopping around on the rim. After I remounted that tire, I put 15 psi in each and I didn't see the problem again as I finished that mowing session. Any similar problems - any ideas? Thanks.