GPX Demon 150GR Bike Price in Bangladesh 2020. Which Engine Type is 4 Stoke SOHC. This bike is powered by the 149 (cc) Engine. GPX Demon 150GR Transmission duties are taken care of by a 6 Speed Gearbox. GPX claims that the bike offers a mileage of 35 Kmpl (approx). GPX Demon 150GR Front Suspension is USD and Rear Suspension is Monoshock. GPX Demon 150GR Price is 260,000.00 Taka (approx). Click Here to find GPX Motorcycle Showrooms in Bangladesh.