S-works sl3 frame

I have wanted to buy and build my own bike for a while and love the 2011 sl3 frame,
There's lots of second hand deals going around but I'm not certain on size
Im a little over 5ft 10 with a 32" inside leg
I have a 56 roubaix at the moment and it feels a little big!
Please help 54 or 56
Thanks guys
There's lots of second hand deals going around but I'm not certain on size
Im a little over 5ft 10 with a 32" inside leg
I have a 56 roubaix at the moment and it feels a little big!
Please help 54 or 56

Thanks guys
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Posts
I'm about 5'11 and have a 54cm sl3. With a saddle height of 76cm the drop to bars is big, 13cm I think.
A 56 would be ok in terms of drop for me but would leave me with a short stem, neither really work for my proportions.
It's a nice bike but isn't working for me. If you decide on a 54, I've got a neon red s-works I'd part with.
56 all day long in my opinion. I am 5'9 with a 29' inseam and a long body so run an SL3 with 170mm HT, slammed stem and 110mm on that. 54cm I fear will simply be too small for you, like a BMX !