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:Renard Grand TourerKawasaki Ninja 250R Limited EditionAprilia SXV GP45 Super TwinArch Method 143 ConceptYamaha FZR 750 OWO1 1989Jesse James Honda VTX Café RacerAbsolute by Hi-tech ChoppersBMW R NineT by Mr Martini