Originally Posted by cs1

There aren't many new bikes, of any type, that use horizontal dropouts. Many moons ago mfg's decided that all bikes should have short chainstays so they could look sporty. Then they found out that you couldn't get the wheel out with horizontal dropouts. Vertical dropouts solved the problem.

Like Cynikal said, you really need to get an older bike to find horizontals. Problem is that most are spaced 120mm to 126mm. Life is full of trade offs. Good luck

Tim