the420star

I am getting in to biking for exercise, and am looking to get a used road bike. I have been watching Ebay and see some stuff that I am interested in, i just have one question. How long do components last for? I have found a bike i want with 2K miles on it, is that a lot? How much longer will the 105 components on the bike last? I know the components are a lot of money to replace. If anyone knows, i would really appreciate hearing it.

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