Here's the Cycle Ergo website http://cycle-ergo.com/ just click "add a bike" to get started. But really, if you like your bike, except for long tours, a custom saddle from Russell Day Long, or Rick or Rocky Mayer (brothers who aren't on speaking terms with each other) will give you a little more height and butt comfort for long trips. Mine is even heated. Lower pegs will limit your lean angle somewhat, but if you don't drag the pegs that might not be an issue. And there are touring windscreens to fit almost every bike, including F800ST. If you're happy with the engine, brakes, steering and balence, but just need a little more comfort for those 700 mile days some adjustments could be all it takes and save thousands.