Intention Designed to provide a lively and energetic ride, Nipples will revitalize any setup for carving, pumping, dancing, freestyle and freeride. Compatibility: Nipple bushings fit Paris, Tracker Fastrack, Gullwing Charger II, and old (pre-2010) Bear trucks. They are not compatible with new Bears, Gullwing Chargers, or Indys. Nipples work with Randal trucks, but they do not sit completely contained in the bushing seat. Since the Randal bushing seat is so low, however, it does not interfere with the performance of the bushings. They fit Caliber trucks, but the lean becomes very restricted past a certain point. Many of our ambassadors have also run Nipples in various precision trucks (e.g. Aera and Omen) with good results. This compatibility list is based on the trucks we use most. Nipples will fit in any truck that can accommodate a 1-inch diameter bushing with a height of 0.66 (bottom) and 0.56 (top) inch.