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Today, BMW unveiled the 2021 R 18, a retro-style cruiser that looks nothing like any other BMW motorcycle currently available. Inspired by the BMW R 5 from the '30s, the bike has an open-running driveshaft, a double-loop frame, and a 1.8-liter horizontally opposed two-cylinder engine that's called the Big Boxer. With a relaxed seating position, a "no-frills technology" approach, and a frame design prepared for the aftermarket scene, the R 18 strives to please purists and customizers alike.