Uh, if you have threads sticking out the sides of the tires, they are not a bit worn. Still, when you get a new bike, it just has to be significantly better and/or different than the old one, or what's the point. Ride the oldie, and start saving so you can seriously research the new bikes. The oldie becomes a spare, of course.
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Some people are like a Slinky ... not really good for anything, but you still can't help but smile when you shove them down the stairs.