There are many designs for bike holders shared on youmagine. But while riding roadbike you have the probleme with the capacity of the battery.(using routing-apps and gprs less than 1,5hours) That´s why I decided to add an additional battery(10000mAh) to the design for longer trips. The biggest advantage of the design is the ability of using screws to distort all components. With that I can reach a high stiffness and there is no loosen while driving across bumpy roads. With the additional capacity I can use my phone(with activated gprs) for more than 7 hours. And it´s pretty easy to unplug the package from the bike. For assembling it´s necesarry to drill holes. The size depends on the used screws. I used 4mm screws and 3mm set screws. For mouting the base to the handlebar I used 5mmx250mm cable ties. To prevent slipping of the battery I used duct tape on the ground of the main plate.