The centerpiece of the 999R is Ducati’s fabulous eight-valve, 90-degree Testastretta twin with desmodromic valve operation. The 999 “desmo” system is a far cry from Dr. Fabio Taglioni’s original design in the ’50s and ’60s, but the desmo concept—now so closely identified with Ducati—remains a linchpin of Ducati technology. The R-model departs from its 999 stable mates with a radically over-square high-revving engine: 104mm high-compression pistons run up and down on a 58.8mm stroke. The connecting rods are titanium, as are the valves. The engine breathes deeply courtesy of the remarkably efficient Marelli fuel-injection system and dual 54mm throttle bodies.

We call it “remarkable” for several reasons. As for fuel economy, we squeezed an astounding 61.87 mpg on the highway—while managing only 31.10 mpg during more daring exercises. A lofty 12.5:1 compression ratio aids the rapid engine response and similarly helps the engine to produce its claimed 150 hp with 80 lb ft of torque. (Click image to enlarge)

When experiencing the Testastretta’s potential, its engine fills the air with a mix of mechanical music. The roaring induction, whirring valve-train, clattering clutch and free-flowing exhaust note all engulf the rider. It’s just incredible, and not unlike being aboard a 185 mph soundstage. The robust powerplant responds to the slightest input and produces instantaneous revs and immediate power. Starting at 3,000 rpm, an on-demand power delivery comes with a seriously entertaining surge. The awesome mid-range of the L-twin powerplant rewards smooth riding with jet-like corner exits and minimal gear changes. Typically, strong twins start their acceleration with a torque-rich thrust which progressively tapers down as the engine reaches its redline. With the 999R, the taper seemingly never occurs; the rider senses that the bike is accelerating at an ever-increasing rate—right up to 10,000 rpm, where the rev-limiter signs off the power. When exploring the upper powerband of the R-model, one thing is absolutely clear: The rider becomes the tested subject, not the machine.

Ducati continues to refine its traditional, and very effective, tubular steel trellis frame. Structurally, this layout allows the frame to encompass the slender engine very tightly while still affording accessibility. Compared to all its competitors, the 999R has by far the narrowest frame cross-section between the rider’s legs. This dimension, combined with the comfortably low seat height and a straight leg path to the ground, permits even those with short inseams to plant both feet while seated.