Custom Triumph Grand Prix 1947 Triumph Grand Prix 1947 SPECIFICATIONS, PRICE & IMAGES Engine: parallel twin 500 c.c. o.h.v.; valve operation by Ignition: magneto. Transmission: chain via four-speed gearbox. Frame: cradle type with single down-tube and twin Forks: telescopic. Bike Features More Bike Specifications:330 Pro-Street by ladytamer ChoppersBMW R Nine T DA # 4 by Diamond Atelier Triumph Ghost by Smoked GarageDucati 860 CorsaKawasaki ZZ-R 1400Kawasaki Z 1000G-1 ClassicKawasaki GPZ 600R NinjaHonda CB1100 Scrambler Challenge Big One