During this MC Commute, we swing a leg over Aprilia’s RS660 Factory, a middleweight sportbike that feels like it was built for riders who live in the twisties but still ride in real-world traffic.

Yamaha jump-started the liter-class sportbike segment 21 years ago with its original '98 YZF-R1. Over the years it evolved, at times teetering toward a more street or track focused design depending on ...