Bicycle tyres?

I have just split my third rear bicycle tyre in about one year. I just do not understand why they are splitting so easily! I'm considering buying another one, and perhaps replacing the rear wheel. I've seen a whole new bike for the prices that I can find for the cheapest tyre and wheel. Does anyone else... show more I have just split my third rear bicycle tyre in about one year. I just do not understand why they are splitting so easily! I'm considering buying another one, and perhaps replacing the rear wheel. I've seen a whole new bike for the prices that I can find for the cheapest tyre and wheel. Does anyone else find that the component parts do not add up to the whole when purchased separately?
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