Having longer legs I need a shorter frame.
Using stats from USA military anthro data the predicted 95% confidence interval for inseam for a 5'10 male is 84.7cm +- 5cm. So your inseam is pretty much right down the middle of the population
- neither long nor short. Note that I'm not arguing about your fit - your saddle height is what I would expect it to be and a 54 is a sensible size - I'm just making the point that the inseam ratio is not a constant across the height spectrum as some fit systems would have you believe - it scales allometrically.
timzcat - a 58 Evo would only mean a 1cm shorter stem required than the R3. Which could possibly be made up with bar reach if you don't like the look of a short stem. You actually have a few different sizing options. If you give more position data (saddle setback, reach to bars, bar model, drop) it would be easier to compare. Though it's probably worth sticking with the R3 for a bit longer while you adapt your position as the best option may alter if you end up going a lot lower over time.
Attached is an example of how I would set up two different sizes of Evo for myself (given that I've had 8 Cannondales the Evo is a strong contender to be no. 9). Very similar weight dist, same stem length, minor difference in bar reach and a few spacers. If I wanted the option to go higher I'd likely choose the 60 and if I wanted room to go lower - the 58.
- 3D Motion Capture and Frame Finder Software