The bike is a 2007 K2 Enemy, their cross bike. I'm currently running it as a 1x9 with a Tiagra Brifter, 38t chainring, Ultegra rear derailleur and 12-25 cassette. I have another ultegra derailleur that's a short cage I plan on putting on. Kind of silly to use a long cage with a single chainring, but this one was free, so no complaints.