I have been using the new SLR flow for a few weeks. It does look flatter but I fits very nicely and still conforms like the old SLR.

check the 'technical drawing's on sella italia's website - you will see that even between the carbon railed and titanium railed there is a difference of 8 mm if I recall well (the carbon one having the higher stack height)

Thank you for your help! I got to the bottom of it I have an old SLR Carbonio (carbon rails) which measures 40-41mm from the bottom of the rail to the top of the saddle. This is the same as the measurement on the technical drawing on their site for the new version. So, the old carbon railed SLR has the same stack height as the new one.

My latest generation SLR Kit Carbonio (regular hull, not Flow) is 35,5-36mm at the top of the lowest point in the middle to the bottom of the carbon rail. It was higher when new but went banana pretty fast. I'm only 67kg.

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Roadbike
Kinesis RaceLight T2

Mountainbike
Van Nicholas Zion Ti