Jeep Liberty/Tires & Rims/List of States Where Wheel Spacers are Illegal
From Wikibooks, the open-content textbooks collection
Many older and cheaper lug centric wheel spacer design were unsafe and gave wheel spacers a bad reputation. As a result wheel spacers are now banned in the following states. Keep in mind that hub centric cast aluminum wheel spacers are usually perfectly safe as long as they're regularly checked for tightness.
- Pennsylvania - spacers thicker than 1/4" are banned (Title 67 of the PA Code)