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@Yemble
Working out measurements for a new frame has been an interesting process.. particularly measuring stack & reach on my current bikes and comparing with the ratio on other known models where the manufacturer provides them for similar size eg
Specialized Tarmac 0.73 R/S ratio, Roubaix 0.69
Cannondale SuperSix 0.72, CAAD8 0.69, Synapse 0.66
My bikes (measuring tape & pythagoras)
2010 Focus Cayo: 0.76
Ribble "[nearly] horizontal top tube" 7005: 0.82 (!)
Going for 532 S 382 R = 0.72 on the new frame. Which happens to be almost exactly the same as a 52cm SuperSix. Relatively slack compared to what I've been riding til now!