An adjustable fender vehicle has an upper wall with inner and outer side walls. The inner side wall includes an elongated longitudinal clamping edge and an interior wall depends from the underside of upper wall between the inner and outer walls. The interior wall has an elongated longitudinal opening in registry with the elongated longitudinal clamping edge in the inner side wall for receiving a fastener for adjustable mounting of the fender to a vehicle. The inner side wall includes an elongated longitudinal opening in registry with the elongated longitudinal opening in the interior wall and the elongated longitudinal clamping edge is formed in the elongated longitudinal opening in the inner side wall. The elongated longitudinal opening is configured to receive a mounting arm that is adapted to extend through the elongated longitudinal opening to the interior wall. Fasteners on the mounting arm clamp the fender to the mounting arm.