The 15bhp, 264lbs, four-stroke Aprilia RS4 125? It’ll be joining the Aprilia Tuono V4R in America next fall. But wait, you say, isn’t this just a re-bodied Derbi GPR 125 and don’t four-stroke 125s suck? Yes and no. Because it’s a four-stroke it’ll be street legal and that Derbi is the most high-spec 125 available [...]

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