Sorry you are having trouble with the saw Bruce, but, tires are like blades, they do wear out, and need replacing.
I'd bet that most of the bandsaws out there, over a few years old, could benefit from a new set of tires, I think they are one thing that often gets overlooked.
I do have to say, I'm a bit surprised that the tires only lasted 2 years, seems a bit odd to me, but
Have you heard back from Rikon?
The pessimist complains about the wind; the optimist expects it to change; the realist adjusts the sails.
William Arthur Ward