Daria,
Bicycles are allowed for Trail Orienteering according to the rules on both the IOF web site and the Orienteering USA web site.
IOF Trail Orienteering Rules
1.2 The mode of movement may be:
• on foot
• by wheelchair, either manual or electric
• on bicycle, tricycle or handcycle
• other modes, any recognised mobility aid.
No combustion-engined vehicle, nor any battery driven vehicle designed for more
than one occupant is permissible.
Orienteering USA Trail Orienteering Rules
D.2.2 The mode of movement may be:
a. on foot
b. by wheelchair, either manual or electric
c. on bicycle, tricycle or handcycle
d. other modes, any recognized mobility aid.
Robert Buraczynski