I mess with and have worked in a bike shop for quite a few years, only reason to do this is because you don't want to take the time or don't have the equipment to do it properly. I have taken them out of a few bikes, for whatever reason mostly springer front ends. My experience is that low end tires are worse off than a quality tire and if you can have them road force balanced for your car, even better. The whole, this size tire takes this many irregardless of the weight it needs and that the tire needs to rebalance itself everytime you stop, doesn't makes sense to me. It works with the m/c tires because they're usually close tolerance and most take very little weight to begin with, if you spin the tire on the rim sometimes zero.