I have been searching long and hard for a good quality chalk for all motorcycle tire sizes. I want to permanently Mount one on my trailer that fits everything. I really like the steadymate 80014 I've looked up truck reviews and people seem to have this and rather high regard. According to the review it was supposed to fit 12 inch up to 21 inch. That's what it said on the review. When I look on Amazon or Ebay to order one ninety percent of the sellers say it fits 14 to 21 in. Only in the review, and one or two other sellers put it in print 12 to 21 in. I understand that the main concern is rotor clearance. Could a person simply cut a piece of wood to raise it 2 inches and still be safe?