Single downtube rigid frames with Chopper-style necks that use a 1941–1969 four-speed transmission instead of the old three-speed unit. We designed a special engine sprocket (see below - must be purchased separately) for Big Twin dual row primary chains and positioned the transmission mounts so that the primary drive com-ponents and special Paughco covers from an early 74" Big Twin can be fitted to the bike. And for those who don’t want to deal with a wet clutch, we have a BDL belt drive unit instead (see below - must be purchased separately).
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