I wonder how you would set the damping to maximise the assistance effect during 'bedroom athletics' from a one off experience a water bed is great for that (or at least the one we were in was) although it was horrid for sleeping as it made me motion sick.
Currently riding a Whyte T130C, X0 drivetrain, Magura Trail brakes converted to mixed wheel size (homebuilt wheels) with 140mm Fox 34 Rhythm and RP23 suspension. 12.2Kg.
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B'Twin Triban 5