Roadmaster Rex Bike Price in Bangladesh 2020. Which Engine Type is Air-cooled, 4 stroke, Single Cylinder. This bike is powered by the 84 (cc) Engine. Roadmaster Rex Generates Maximum Power 4.5Kw @ 8000 rpm Transmission duties are taken care of by a 4 Speed Gearbox. Roadmaster claims that the bike offers a mileage of 60 Kmph (approx). Roadmaster Rex Front Suspension is Telescopic and Rear Suspension is Twin shocks. Roadmaster Rex Price is 70,900.00 Taka (approx). Click Here to find Roadmaster Motorcycle Showrooms in Bangladesh.