Went for a short ride today - down to Golden Gardens and back on my old bike. My Kona is in the shop and apparently my rear tire that I spent a grip of money on has already cracked. Is it normal wear and tear? Or is this a warranty issue? Is it typical to put 4000 miles on wheels and then have to retire them? None-the-less I am in the market for a trainer so my nice bike doesn't see the miles that I have been neglectfully putting on it. Know anyone trying to sell a 54cm bike with decent components? urgh. I get so frustrated when it comes to sourcing new equipment because I am not the biggest gear head and there are sooooo many products out there. Any guidance would be stellar.