Just another comment on the 56cm sounding too big to me also. I would agree a 53 or 53cm sounds more likely. My dad is 5'9 and rides a 54cm. I am a tad over 5'11 and ride a 56cm.
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Dogma 2 - ex Team Sky
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Incidently try Fleabay, Loot, Gumtree and using the Classifieds section on these forums, might get a bargain! Welcome to the world of fun!
56cm sounds a bit big for 5' 8 - are you sure you've thought this through..?
53cm or 54cm is more usual for someone of that height.
Perhaps someone in the cycling club has a suitable bike.
Tarmac Expert SL3 - test colours
Dogma 2 - ex Team Sky