Those lowers are for more than just protection, since the 2016 Road Glide for the first time gets the Twin-Cooled 103ci engine that debuted on the Ultra Limited dresser and, well, that’s where Harley hides the twin radiators. This mill is by now familiar, but the selective use of liquid cooling allows a higher compression ratio—10.0:1 vs. 9.7:1 for the high-output versions of the air-cooled 103—for better power and improved efficiency. Still largely air cooled, still two valves per cylinder operated by pushrods (just fine with a 5,500-rpm redline), and still as mechanically talkative as any Harley, the Twin-Cooled 103 has superb manners for this kind of engine. Tons of low-end torque, virtually no vibration for the rider (thanks to the rubber mounting system), and fantastic throttle response through the ride-by-wire system. Tall gearing puts typical highway speeds under 2,500 rpm in sixth, where the 916-pound (claimed, wet) Ultra has no excess of roll-on performance. Summon fifth. Maybe fourth.