Not every sportbike rider wants a 190-some-hp superbike. So for 2021, Italian motorcycle manufacturer Aprilia expands its sport motorcycle lineup with a smaller and more affordable version in the RS 660 ($11,299). Powered by an RSV4-derived, but more compact, 659cc parallel twin, the 660 is aimed at riders who want a real-world sport machine that splits the difference between practicality and fun.