With your GPS device in a bike holder on the handlebars, you always know how to find your way safely on the bike. Bike holders are available for smartphones, sports watches, cycling computers, and hiking GPS. Some bike holders on this page are made for specific devices. Make sure you choose a bike holder that is suitable for your GPS device. It's also important that a bike holder with handlebar mount fits on the handlebars of your bike. First measure the diameter of the rod.