The Enclosed motorcycle US 20030102657 A1 from Google Patents imagines a recumbent rider of a two-wheeled motorized vehicle. Presume a wheel base of 90in (my rough estimate from the figure, not a patent specification) and a CG 25in forward and 24in above the point where the tire contact the back road. Presuming a coefficient of friction with the road of moo=0.52 determine the maximum acceleration and deceleration the vehicle may have presuming rear-wheel drive (clearly from the figure) and presuming 100% front wheel braking.