My mental stability is at stake. I cannot for the life of me find out what kind of mountain bike I have purchased, that was why I got it in the first place. It looked "neat". So here goes a description of it It is a polished aluminum hardtail frame, no stickers. The top tube if you are looking at it from the chainring side is kinda cut out and machined for the cable routing. Th e down tube is an oval shape with a 1/4" or so "flat spot" on the top and bottom of the tube. It also has Removable rear dropouts, not just a removeable derailleur hanger, but removeable rear dropouts on both sides. The serial # starts with a C then has six digits after it, then four more digits below the six. thats as good a description that i can give without the bike in front of me. My friend has it and is trying to figure what kind of bike it is too. Im gonna take a few pics of it and when I figure out how to post them I will do so.