Columbus Cyclery Go Bike It at 2011 Mason Street, San Francisco, California.

I traded in a week old $99 bike for a bike in well-used condition which costs $450 new, ( I found out later), and I paid nearly $300. They replaced a cracked tire before I left the shop, thanks fellas, but when I drew attention to a worn- out chain they said it was ok. Another shop later showed me the chain wear was outside the scope of their measuring tool. These guys are ok..but they took advantage of my ignorance. I shouldn't have trusted the fairness of the price I paid. My bad. Just hurting a little.