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If you're buying a pre-assembled bicycle, it's a good idea to ask whether you can have a free check-up for the bike (doing this allows you to check on all bike parts, making sure they are in good working order and adjusted correctly). After all, you don't know how long it's been sitting in the store or how many times it's been test driven.
*Most bike parts are fairly universal and most service people can give it an effective go over.