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This is the original geared hub design that multiplies torque inside each wheel of the Hummer H1. The Mercedes-Benz Unimog is one of the only other vehicles to offer this crawling-friendly feature. The H1 Alpha has helical-cut gears (the older, straight-cut version is shown) which are quieter and reduce rocking motions during deceleration and stopping maneuvers. The big disc inside of the tire is part of the runflat tire system.