Specialized Roubaix what size?

I`ve been looking at a 2013 Specialized Roubaix Sport, it`s available in 2 separate shops in 52 in one and a 54 in another. I`m 5`8" with short legs and I think the 52 would probably be best but both shops recommend the 54. I had a Giant Defy in a medium(50) but found it to be a little too long for me. Any advice?
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Posts
Best thing to do would be to get on both and give them a good ride.
If you have a longer torso and arms then the longer reach of the 54 may suit you better, but that depends if you can get the saddle at a suitable height. The 52 will give you a shorter reach and may also give you a lower drop (saddle to handlebars) although if you were bothered about that then I guess you wouldn't be going for a Roubaix.
Peter
It sounds like you've had issues and have decided that going for a "more comfortable" sportive bike is the way to solve them.
I think you would be much better off getting a decent bike fit (for example, Retul) and then buying a bike to that fit. Then you'll know what size to get, too
The Tarmac is a different shape so not comparable.
Interesting that spesh changed their sizing tables from 2013 to 2014. Personal feel and bike fit are what matters. I rented a Boozes Moreas recently and had to get a 52 to give the exact same reach etc as I have on my 56 spesh.