How to measure your tires to determine which tire rack would fit your set of tires:
Stack all four tires on top of each other and measure the height.
If the height is less than 42" - Regular - h 20" x w 45" x d 22" - Car Tires
If the height is less than 45" - Medium - h 20" x w 48" x d 22" - Large Car Tires
If the height is less than 51" - Large - h 24" x w 54" x d 26" - SUV & Truck Tires