Yes, it'll fit most bikes. The problem is that your brake bridge is where it is, your saddle is set to a certain height because that's where you want it, and your saddle bag is the size it happens to be. Now when you attach your bag to the loops at the back of your saddle, you want the bottom of the bag to rest on the top of the bag support. Maybe you'll get a perfect fit; more probably not. If the support is too high, you are out of luck. If your support is too low, you have to loosen the straps that hold the bag to the saddle loops and hope this makes all the difference.