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I am currently riding a 54 CAAD 9. Stack is 546 and reach is 383. The geometry is here:
Now Felt has this size chart based on height, I know it is the worse predictor of what size you need. But none the less they still have it up:
I am 5'10'' and they have me riding a 56 or 58 for the F frame. Can that even be right? Based on the current geometry the 54 would fit me the closest by giving me a stack of 526 and a reach of 389. Depending on how flexible I am I might not need any extra spacers on the Felt or maybe one 10mm spacer.
Now looking at the size 56 (548 stack and 397 reach) and 58 (569 stack and 412 reach) those seem a bit outside what I would fit someone my size. I could fit the 56 as I am really in between the 54/56; either one would do fine. However I really prefer the smaller size and going with a little longer stem rather than the larger frame and shorter stem. So I can see the 56 as a recommended size, however the 58 just seems way out there. Sounds more like a frame for a guy 6'2''+. Am I missing something here?
Seems like the 48= XS, 51=S, 54= M, 56=M/L, 58=L, and 61=XL. That is just a rough grouping. Should I just ignore Felt and go with my stack and reach numbers off my CAAD9?

Now Felt has this size chart based on height, I know it is the worse predictor of what size you need. But none the less they still have it up:

I am 5'10'' and they have me riding a 56 or 58 for the F frame. Can that even be right? Based on the current geometry the 54 would fit me the closest by giving me a stack of 526 and a reach of 389. Depending on how flexible I am I might not need any extra spacers on the Felt or maybe one 10mm spacer.
Now looking at the size 56 (548 stack and 397 reach) and 58 (569 stack and 412 reach) those seem a bit outside what I would fit someone my size. I could fit the 56 as I am really in between the 54/56; either one would do fine. However I really prefer the smaller size and going with a little longer stem rather than the larger frame and shorter stem. So I can see the 56 as a recommended size, however the 58 just seems way out there. Sounds more like a frame for a guy 6'2''+. Am I missing something here?

Seems like the 48= XS, 51=S, 54= M, 56=M/L, 58=L, and 61=XL. That is just a rough grouping. Should I just ignore Felt and go with my stack and reach numbers off my CAAD9?