I have looked throughout the forums and am still a bit undecided on what frame size I might need. I plan on ordering a Motobecane Fantom 29PRO from Bikesdirect but am not sure if I should go 17in or 19in. I have a hybrid I use for trails and some easier single track, it is 18in. I have 2 LBS here and have been to both talking about frame size, one says 17 the other 19. I did stand over a felt road bike 58cm and it was perfect. Let me add that I want to be able to do trails but I think the majority of my ride will be pavement and hard pack. I am 5'10" Ind I believe my inseam using the level against the wall method is 32. I still have not found an answer to weather the sizing is different because it is a 29er. Anyway, any advice would be greatly appreciated.