Big Ben, fish and chips, the Beatles, Windsor Castle, and…the Triumph Speed Twin. For motorcyclists—Brit-bike fans, in particular—the original Speed Twin is a two-wheel icon. Following its debut in 1938, the 500cc OHV powerplant became the first commercially successful British parallel twin and went on to set the bar for countless engines of that type to come. For 2019, Triumph has reintroduced the model name to its Modern Classics lineup with a new 1,200cc engine, updated electronics, and a chassis from the Thruxton. The attractively finned eight-valver benefits from the same state of tune as that of the Thruxton (low-inertia crankshaft, 11.0:1-compression pistons), but it features a new clutch assembly with reduced rotating mass, magnesium camshaft covers, and lighter side covers that shed more than 5 pounds from the engine alone.