In Najma & mansoura area are several bike shops. One that I can give you directions to is on the Cring from Ramada towards the airport. Turn left at the traffic light just before the cinema. Go straight down to the end where the traffic light is. This is the area of Najma & Mansoura. At this traffic light turn left and there are some bike shops on your right. The best time to visit this area is in the am or just after 4 pm. Lots of traffic!