First year of the three-speed gearbox and primary case clutch. It gained a 37% power increase over the 1914 models because of its larger inlet valves and both valve seats being chamfered at 45° rather than the previous 60°. Harley Davidson claimed 29 new refinements in 1915 over its previous year. This Model 11 Twin is in remarkable original condition with original Renault grey paint and pin striping. A remarkable find for a century old machine.
