two-mass-skate bicycle
... that a two-mass-skate bicycle has demonstrated self-stability even though it has minimal gyroscopic effects and does not have positive trail, two features most commonly associated with bike stability?
... that a <b id="mwA8w"><a href="./Two-mass-skate_bicycle" id="mwA80" rel="mw:WikiLink" title="Two-mass-skate bicycle">two-mass-skate bicycle</a></b> has demonstrated <a href="./Bicycle_and_motorcycle_dynamics#Self-stability" id="mwA84" rel="mw:WikiLink" title="Bicycle and motorcycle dynamics">self-stability</a> even though it has minimal <a href="./Bicycle_and_motorcycle_dynamics#Gyroscopic_effects" id="mwA88" rel="mw:WikiLink" title="Bicycle and motorcycle dynamics">gyroscopic effects</a> and does not have <a href="./Bicycle_and_motorcycle_dynamics#Trail" id="mwA9A" rel="mw:WikiLink" title="Bicycle and motorcycle dynamics">positive trail</a>, two features most commonly associated with bike stability?