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you get alot of extra's with the speedy...

First figure out if you're a chrome person as the SM has blacked-out engine/gearbox cases. As far as the 16T sprocket, it's what gives the SM character. The twin discs up front provide awesome stopping power and may provide a safety edge to some in comparison with the America. Also, be advised that the performance figures for the two bikes are different (but don't get wrapped up in that). Go for whatever appeals to you visually and the most comfortable riding ergos.