In recent years the Whipple Carvallo Bicycle Model has been
extended to analyse high speed stability of bicycles. Various
researchers have developed models taking into account the effects
of front frame compliance and tyre properties, nonetheless, a systematic
analysis has not been yet carried out. This paper aims at analysing
parametrically the influence of front frame compliance and tyre properties
on the open loop stability of bicycles. Some indexes based
on the eigenvalues of the dynamic system are defined to evaluate
quantitatively bicycle stability. The parametric analysis is carried out
with a factorial design approach to determine the most influential
parameters. A commuting and a racing bicycle are considered and
numerical results show different effects of the various parameters
on each bicycle. In the commuting bicycle, the tyre properties have
greater influence than front frame compliance, and the weave mode
has the main effect on stability. Conversely, in the racing bicycle, the
front frame compliance parameters have greater influence than tyre
properties, and the wobble mode has the main effect on stability
