Hi, If anybody can advise I would really appreciate it. I'm looking at purchasing a Boardman MX Hybrid Sport. On Boardmans website it says that the medium frame (49cm) is suitable for between 5' 6" & 6' tall. I am 5' 8" & have tried this size/brand bike in my local Halfords. When I am standing with my feet on the floor there is little or no clearance between the top bar & my vulnerable bits. Is this bike too big for me even though Boardmans says otherwise?? I'm worried that I go for the small frame (45cm) & it's too small. Thanks in advance.