Hi, I'm in the middle of setting up a new Trek 520. I've been researching the Zefal HPX Classic and the Road Morph G pumps. From what I can see, both pumps should work well for me. I think my indecisiveness may stem from not being sure how I want to mount the pump if I want to mount it at all. It might be something I don't like on the top tube (but not sure why) or any tube and may carry it in my bags or even strap it to my rack when out for a short ride. If I were certain I would want to mount my pump to the top tube I definitely would go with the Zefal. I don't think I want to deal with Co2 cartridges, right? I was wondering if I might be able to glean something from the wisdom/experiences of others who have first hand knowledge. Thanks for all of your insight. Sport.