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2 wheels vs 4 wheels - or 3? or 5? Whats the difference for Inline Skates? - YouTube
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Post Modern Skateboard has no board, just two wheels - CNET
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Got my first pair of aggressive inline skates! but its quite heavy though, and its kinda a two wheel drive. : r/rollerblading
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Today 111 years after P. Jassmann invented his two wheel "roller skates' we have the "Land Roller." What took so long? | Inventions, Roller, Roller skates