So I wound up quite excited when Aprilia offered me the chance to test the hottest of them all, the RSV4 Factory, on track at California's Buttonwillow Raceway. Read more: 12 Major Motorcycle ...

The Aprilia RS 660 is a new kind of comfortable ... 5.38kg rear) and a slimline subframe, which is 16mm narrower than the RSV4’s and weighs just 1.98kg, but strong enough to carry a pillion ...