Deepak,

Check your other post about color. You can get the Ortlieb Packer Plus in yellow. All Volpe's have the same chainstay length regardless of size. This is what will determine heel clearance. I also wear a size 44and do not have trouble with heel strike on my Volpe (58cm). I have the Ortlieb Back Roller Classics. Rack configuration might also help out here. My rack is a Blackburn and allows some flexibility.