The 2018 Street 750 performs much like the 500 because they share the same frame, compact 59.8-inch wheelbase, front ends kicked out at the same 32 degrees, coil-over shocks on both rear ends, and each one also sports a 25.7-inch seat height. Both tip the scales at 514 pounds with all the necessarily fluids. But the liquid-cooled Revolution X in the Street 750 is definitely a step up. It has a bigger bore (3.35 inches versus 2.72 inches), a higher compression ratio (11:01 versus 10.5:1), and a slightly larger fuel injector. Riders benefit from an extra hit when they twist the throttle; the 750cc engine pumping out its 44.5 pound-feet torque peak a bit higher in the rev range at 4,000 rpm. It's a solid engine, as evidenced by the fact that Harley-Davidson used it as the basis for its pro flat-track bike, the XG750R. For Harley to replace the winningest flat-track engine of all time, the XR750, with the XG, it surely had to see something special in it. Further proof of its potency is the fact that Andy DiBrino won the Hooligan racing championship last year competing on a Street 750 customized by See See Motorcycles.