The big differences between the existing RCR and this new FCR prototype are of course the aerodynamic optimizations. We don't have any concrete details about aero improvement claims, but these gray & black camouflaged bikes feature much more dramatic aero tube shaping compared to their light all-rounder road bike.
Out back, the prototype Van Rysel FCR aero road bike features a long & narrow proprietary aero seatpost - now a bit deeper even than the RCR. And an internal wedge clamps the seatpost in position, accessed from the top, under the small rubber cover.
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