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@alexellis
The Dolan geometry is different to Specialized and Trek - I assume this applies to other manufacturers too. My Langster 2012 52cm is actually slightly shorter than the Dolan Precursa 50cm which is odd - making their 52cm more of a 54. I'm just glad I didn't buy a Precursa 52cm because I would have needed an inappropriately sized stem also. I now have a '50cm' with 90mm stem.
If you have another road bike or try one in a local bike shop then you can compare geometry between that and the Precursa - but you probably want one size down.