Originally Posted by fuzz2050

It's not the second digits that determine class, it's usually the first. 5xx, 6xx and 7xx are all touring bikes. The 520 needs no introduction, the 720 is even more epic, and almost impossible to find. I have a 610 that has chainstays longer than even the Long Haul Trucker, and the 600 I posted earlier is still rather touring in geometry.