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2-speed gear 500 c.c. capacity accessories addition adopted air-cooled Ariel arrangement average speed became belt bicycle brakes capable chain clutch Clyno commercial production compact Company Continental continued countershaft gearbox crankcase crankshaft cycle cyclecar Cylinder Engines Douglas Douglas motorcycle drove the rear efficient elaborate engine Inv engine unit examples fitted flywheel forecar form of motorcycle four-cylinder engine four-stroke engine frame gearbox h.p. Triumph Harley-Davidson high-tension magneto horizontally-opposed hub gear improved included incorporated increased Indian Indian motorcycle inlet later lightweight magneto manufacturers ment models motor bicycle motorcycle design motorcycle engine mounted operated overhead-valve pedal period petrol piston produced progress prototype pulley quadricycle rear wheel reliable rider road Royal Enfield Scott shaft drive side-valve sidecar single-cylinder engine solo specific power outputs spray carburettor successful Sunbeam surface vaporiser Tourist Trophy Race tricycle Triumph motorcycle tube twin-cylinder twin-cylinder engine two-stroke engine tyre valves variety vee-twin vee-twin cylinder vehicles Velocette vertical twin-cylinder Villiers Werner