m this embodiment has one degree of freedom the orientation of the bicycle frame he can be manipulated by applying a horizontal force to the slider m such a force will cause the connecting rod el to move and thus effect a change in the orientation of the bicycle frame he particularly movement of the slider m towards the back of the bicycle lowers the front of the bicycle movement of the slider m towards the front of the bicycle raises the front of the bicycle this movement is achieved because slider m is connected to sufficiently rigid connecting rod el as can be seen in this embodiment no additional components are required to elevate the bicycle to achieve this downhill position and the mechanism to achieve it does not unduly limit the downhill angle that can be achieved this embodiment can be referred to as an r r r p implementation another embodiment referred to as an r r r r mechanism is shown in fig2 a schematic and 2 b kinematic fig2 depicts a u2018 four bar u2019 four link mechanism in this embodiment the ground is link 1 the bicycle frame he is link 2 the coupler en is link 3 and the crank o is link 4 this mechanism also has one degree of freedom one approach to manipulating the orientation of the bicycle frame is to control the angle of the crank o for example a torque applied to the crank o will cause a change in the orientation of the bicycle frame he in particular exemplary embodiments adjusting the crank o towards the front of the bicycle brings coupler en forward raising the front of the bicycle while adjusting.