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In 2017, Harley unveiled a completely redesigned Softail frame for the 2018 model year, the first major change since the introduction of the Twin Cam engine in 2000. The 2018 Softail frame uses a differently shaped swingarm suspended by a single rear shock absorber, mounted underneath the seat in a similar fashion to the original Haubert and ...
The frame was redesigned to be lower-slung and had a spring suspension in the rear downtube. Models 9A, 9B 34.47 cu in (564.9 cc) IOE single 1913 Model 9A was belt-drive-equipped; 9B, chain-drive. The updated single-cylinder motor used a mechanical intake valve, like that first introduced on the V-twin model. Model 10F
The frame is pressed or stamped from sheet metal to form a car-type semi-monocoque. One of the earliest examples was the 965cc motorcycle produced by Louis Janoir in 1920, which used pressed steel for the frame, rear swinging arm, and the front forks. The frame may be entirely pressed (Ariel Arrow), or may have just a pressed aft section ...
Many builders eschewed Harley "pattern" motors and frames and started building choppers out of neglected bikes like Yamaha XS-650 twins, old Harley Sportsters, and various 1980's so called UJM bikes (four cylinder air-cooled Japanese bikes - Universal Japanese Motorcycle). Another aspect of the backlash was a return to more traditional styling.
The cam followers used in Sportster engines, K models, big twin side-valve models, and the side-valve W model series, were a slightly shorter version of the followers used in the larger motors, but featured the same 0.731-inch (18.6 mm) diameter body and 0.855-inch (21.7 mm) diameter roller follower used since 1929.
The Fat Boy was one of numerous Harley-Davidson models built on the Softail frame. After 1994, the exhaust was made seamless. In 1996 the master cylinder and switch gear were revised. In 1999 a new 1,450 cc (88 cu in) Twin Cam engine for the 2000 model year was used. This necessitated a bespoke engine variant and changes to the frame.
The frame is typically made from welded aluminium or steel (or alloy) struts, with the rear suspension being an integral component in the design. Carbon fibre, titanium, and magnesium are used in a few very expensive custom frames. The frame includes the head tube that holds the front fork and allows it to pivot.
Bobbers are typically built around unmodified frames, while choppers use either highly modified or custom-made frames. [13] Chopper frames are often cut and welded into shape. A bobber is a motorcycle that has undergone a ‘bob-job’ (hence the moniker 'Bobber'), that is, had extraneous parts removed for simplicity and weight-reduction.