Maxxis beaver xc mtb tyre exception seriesthe maxxis beaver xc tyre exception series folding tyre are specially designed for racing in adverse conditions the beaver features a tread design ideal for wet and muddy conditions the dual compound tread utilizes a hard base layer to reduce rolling resistance and provide knob support while the siped softer outer layer provides unparalleled grip on wet rocks and roots the beaver is one aquatic friendly animal of a tirefeaturesexc the number