ZETA and DRC products are distributed over 50 countries now. They ride dirt bikes. They develop products for dirt bikes. They test, manufacture and supply high quality products for dirt bike riders. Two-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 inches / 135 mm when folded. Accepts mini wheels (up to 12 inches) even while it is folded. Self lock function prevents arm from opening up unexpectedly from folded position.