Features:

Innovative style tire chock.
May be used for pit bikes to full size dirt bikes. (Accepts 8 to 21 inch wheels.)
Maximum tire width : 130mm (5.2 inch)
Folding design saves space. (Height is 135mm ( 5.4 inch) when folded.)
Accepts mini wheels (Up to 12 inch) even while it is folded.
Self lock function prevents arm from openning up unexpectedly from folded position.