I'm exploring a new TT (not a Tri) bike. I have measurements of my current position, which fits and I want to see if I can transfer it to the new bike. I'm thinking of going from a ML Blue Triad to a L or XL Shiv (TT shiv/older shiv model, not the tri specific one). Right now on the Blue (stack/reach of 55.8/41.4) and I'm deciding between a 120 and 130 -17 stem slammed at the moment with low stack aerobar (deda kronos). I measured my stack/reach to center of the armrests in as 61.5/53 (this is with a 120 stem, but I may go 130). I did this by measuring floor to armrest and subtracting flood to BB center (stack), then with the back wheel against a wall, subtracting wall to bb center from wall to pad center (reach).

The L shiv geometry allows for stack between 54.3 and 65.8, so I'm good there. However, I'm confused on reach. Even in the XL size, the max effective reach listed is 51.5, not even close to the 54 I may need. I'm not a long guy either, more legs than torso, so this doesn't make sense to me and I think I may be doing something wrong. I only need such a long stem on my current bike because the Blue is very short in reach.

So, did I do something wrong or am I not understanding something? or will no Shiv really fit me? I'm happy with my current position. This is the closest I have to show it, but it's moved slightly since then, dropped slightly (this was a -10 120 stem, now have -17 and may go 130 as I've mentioned): https://www.youtube.com/watch?v=VFgR1-8mijM

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