Fitting for saddlebags:
There are 3 options:
a) the
saddlebag clamp, a direct replacement for saddlebag loops, clamping to the saddle rails as far back as you can manage.
b) The Bagman QR. Clamps onto the same section of the saddle rails as the seatpost. You need about 15mm of free rail behind the seatpost (test: can you move the saddle that much further forwards than it currently is). The support stops the saddlebag swinging, sagging onto a mudguard, or hitting the backs of your legs. Available without support from Carradice if you just want to let the saddlebag sit on a rack.
c) The SQR Uplift. This clamps to the seatpost below the saddle, and you strap the saddlebag to it in place of the saddle loops and seatpost. You remove the saddlebag and SQR uplift as a single unit so you don't need to fiddle with buckles. It needs about 4" of free seatpost. If you have it as high as possible, the saddlebag loops will be just above and behind the back of your saddle. You need about 3" of free air below the saddlebag to allow the Uplift to be removed.
The SQR bags (SQR Tour etc) come with an SQR mount permanently fitted to them rather than using the uplift.