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The Quantum Air Filled Rear Tires Create A Smoother, Less Bumpy Ride On Uneven Surfaces Or Rough Terrain.FeaturesSmooth Ride: Smoother, Less Bumpy Ride On Uneven Surfaces Or Rough Terrain Firm Grip: Two Pneumatic, Rubber Tires For A Firmer Grip On All Surfaces Click And Go: Quick And Easy Installa..