Oh, and on cobblestones I feel a real rear comfort difference between the L and XL old wishbone frames (tough Pomp v2 L with 35mm Schwalbe Kojaks and soft Pompetamine XL with 33mm Maxxis Mud Wrestlers) -> can it be due to the shorter wishbone on the L? Or maybe this is just psychological...
Unlikely. I'd say the longer top/down tubes on the XL might make more difference, but above all the longer wheelbase means you go up and down less as a proportion of the amount the wheels go up and down. Simple levers, innit?
Oh, and on cobblestones I feel a real rear comfort difference between the L and XL old wishbone frames (tough Pomp v2 L with 35mm Schwalbe Kojaks and soft Pompetamine XL with 33mm Maxxis Mud Wrestlers) -> can it be due to the shorter wishbone on the L? Or maybe this is just psychological...