Torque is measured in pound feet — or, for the rest of the world, Newton-meters — and the Zero SR puts down 106 lb-ft — 56 percent more than its standard S counterpart, and a figure that brings it in line with some of the biggest, brashest, and beefiest bikes in the world. But unlike those bruisers and cruisers, the SR tips the scales at a relatively svelte 400 pounds. High grunt and low mass let you hit 60 mph in 3.3 seconds.

In addition to the extra twist, the new 660 amp motor is good for 24 percent more horsepower, giving you 67 ponies and a Vmax of 102 mph — 7 mph over the standard S.

But the extra grunt and go is only half the story for Zero’s 2014 lineup. The California electric bike manufacturer has addressed many of the shortcomings of its current models, including some we’ve encountered with our Zero DS long-term tester, by revising the suspension and brakes and offering an optional battery pack that extends range to a maximum of 171 miles.