The Roubaix's stack measure appears to be taken to a virtual point above the head tube, because the suspension needs some clear space above the head tube itself. In the case of the Roubaix, as we discussed, the stated head tube length is deceptively short because it doesn't account for the suspension system (which is mounted in the head tube). You mostly don't need to worry about the head tube length per se. To a great extent, the effect of head tube length is already captured in the frame stack measurement. You may be able to achieve your preferred riding position on any of the models you listed. Endurance geometry has a more upright position with relaxed measurements designed for comfort and stability rather than aerodynamics. Riser bars add further stack to your final position. Riser handlebars are rare on road bikes, but a number of Roubaix models are equipped with such bars. Comfort-enhancing frame construction and components plus World Tour-racing DNA make the Endurace the rare bike that’s as smooth as it is fast. It is important to remember that frame stack is measured to a point just above the head tube (except for the Roubaix, see comments on Adam's answer), and that we further modify fit by spacers under the stem, the stem length and angle, and the handlebar reach. MADE COMFORTABLE See the bikes 700x28 (2XS-2XL) Comfort-Boosting Features Endurance-Focused Geo THE IDEAL BIKE FOR RIDING FAST AND LONG Bicycling Go Fast. They do let you visualize how the frame geometry affects the relative riding position between two bikes, although they do not include the effect of the stem and handlebars. They discuss their rationale and some limitations of stack to reach here. They rate the Specialized in your size as being about average in terms of stack to reach compared to other endurance road bikes, and the Domane as being relatively upright. It should show a picture of two overlaid simplified geometry diagrams. The link I inserted may take you to a comparison of the 2020 Roubaix Comp and the 2020 Trek Domane aluminum (but the carbon Domane has the same geometry). One limitation is that they may not have every model and every year of bike entered on their site, but their data appear reasonably complete for major brands. Bike Insights has used stack to reach ratio to compare a number of brands of bikes.
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