Just one for now: a custom-built Cannondale CAAD4 mountain bike. I built it from the frame up with a mix of new and used parts and I upgrade here and there when I come across affordable parts I find interesting. Currently it's at about 10.5 kgs, I intend to drop it below 10.

I would love to add a nice road bike to my collection as well, but since I don't have enough money or room in my apartment for two bikes, I guess it will have to wait. Maintaining this one can get costly enough as it is when you're a student.