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Because you are in direct contact with it. While your car may be dirty on the outside, it may be clean on the inside. Your bike is not protected by anything, so anything that gets on it can transfer to your clothes and hands. In addition, it is also good for the components, if they don't have to deal with...

In all cases when the bicycle has been standing for several years, or if the bicycle is exposed to heavy use and extreme weather. After a major overhaul, the bearings should be re-greased and the bushings replaced after 2 years. Thus, in addition to traffic safety, the lifespan of the bicycle can be ensured for many years.