I've often read where bikes in a given price range have similar quality components. If that is true how would one break down the cost of components on a $500 hybrid ie. frame, tires, drive train etc? This could be done with percentages or with actual dollar costs. Would the percentages be similar for a $1,000 bike? I am thinking of upgrading tires and grips on my $500 bike and was surprised that the upgrades would be $150.