REF: Transmission & Final Drive

In Search of 4 Speed Gear Ratios

Discussion

Good XLFORUM threads on internal gear ratios by dave76 of the XLFORUM
- https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-drivetrain/sportster-motorcycle-transmission-clutch-primary-secondary-drive/73714-4-speed-info?t=513989&highlight=speed
- https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/frame-mount-evo-sportster-talk-1986-2003-models/142108-4-speed-trans?t=1539783&highlight=speed+trans

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