Zero G roll

A zero G roll is a roller coaster inversion found on Bolliger and Mabillard inverted, sit-down, and floorless coasters. On inverted coasters, this inversion is alternately called a "heartline spin" because its center of gravity is placed on the center of the rider's heart. On sitdown and floorless coasters, it is alternately called a camelback.

Roller coasters with a zero G roll include:

• Every inverted coaster ("Fire Dragon" on Dueling Dragons is believed to be the only inverted coaster that doesn't have one)
• Kumba (sitdown) at Busch Gardens, Tampa
• Dragon Khan (sitdown) at Port Aventura
• Medusa (floorless) at Six Flags Great Adventure, also called Medusa East
• Medusa (floorless) at Six Flags Marine World, also called Medusa West
• Superman: Krypton Coaster (floorless) at Six Flags Fiesta Texas
• Scream! (floorless) at Six Flags Magic Mountain