The folks in Noale have a video out now (watch it after the jump), promoting the 2011 Aprilia RS4 125 – the four-stroke 125cc street bike that is a spitting image of the Aprilia RSV4 superbike. With 16hp coming out of that tiny single-cylinder motor and cool styling from its larger sibling, the Aprilia RS4 125 seems like the perfect beginner bike for some teenager in Europe, but we have our reservations about how the bike will sell here in the United States. A classic example of how ideas don’t always carryover, Aprilia seems hellbent on bringing this 125cc bike to a market that demands twice that displacement for practical street bikes.