Ensure the MHS DUO tray can transport any type of bike. The MHS Fendered Wheel block holder expands the MHS DUO compatibility to a wider range of bikes including those with front or rear fenders, mudguards, and specialized eBike frames.Simply swap out the existing DUO arm wheel holder on each arm that will secure a wheel with a fender or mudguard. The MHS DUO Fendered Wheel Block Holder holds the wheel below the fender and can be adjusted to fit a variety of bike architectures.