Wear and tear? A bike is a piece of sports equipment. A tool, not a jewel.

The main advantage of a trainer is that you're still riding the bike you're used to. If you buy a spin bike, you'll be hard pressed to duplicate the position of the saddle and bars relative to your bike.

When it comes to trainers...you get what you pay for. You buy a cheap one, they ride like crap. If it rides like crap, you won't ride it at all. Invest in a KK.