BASIC SPECS: Built around the in-house-designed 750 V-twin, the Shiver is one of the most well-rounded motorcycles in Aprilia's lineup. The DOHC eight-valve engine puts out 77 hp at the wheel and has a nice broad spread of torque. Delivery is easily controlled by one of the first ride-by-wire systems to be used on a production bike and features a choice of three selectable power map modes: Sport, Touring, and Rain.