DRC Moto Binding Tire Stopper D36-51-101 2 way innovative style tire chock can be used for pit bikes to full size dirt bikes. ( Accepts 8 to 21 inch wheels. ) Maximum tire width : 130 mm / 5.2 inch Folding design saves space. Height is 5.4 inch/135 mm&nbsp; when folded Accepts mini wheels ( Up to 12 inch ) even while it is folded Self lock function prevents arm from opening up unexpectedly from folded position