How ya doing Martyn, a tank bag that will work fine for the Speedmaster is the Tourmaster Cortech Super Mini Magnetic Tank bag. I tried one out at a dealership that had both the bag and the Speedmaster, and it fits fine, just under the nacelle of the gas tank, terminating short of the seat front. I almost bought one, before I realized that I wouldn't be able to stow the things that I wanted to throw in there (ie. cell phone, palm pilot, wallet) the magnetic mount system would screw all that stuff up, so I just rely on the saddlebags, and tape maps and directions on to the tank.
