From the Manufacturer
From the Manufacturer Take a ride on a new route and explore the open road with the zūmo 660. This motorcycle-friendly navigator was built to lead you on all of your two-wheeled adventures. Whether you’re on a weekday ride just across town or a weeklong [...]

These fit handlebars to one inch and fits the round mounting attachment on the back of your GPS. These include a rubber strip for smaller handlebars too.
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Buy Motorcycle / Bike Handlebar Mount for TomTom One 125 130 130S 140 140S Ease XL 325S 325SE 330 330S 335S 340 340S [...]

Here is a great mount for your GPS. We have grouped a custom cradle with a handlebar mount that fits bars up to 1 inch diameter. We even include strips so that this mount can be used for much smaller handlebars.
The holder is a real work of art. It permits full access to [...]

No description for this product could be found, but have a look over at Amazon for reviews and other information.
Buy Motorcycle / Bicycle Mount for Magellan GPS at Amazon

GPS is the new wave of navigating, and motorcycle GPS is no exception. But what exactly is GPS and why would you want it on a motorcycle?
GPS stands for global positioning system. It’s a high tech way of saying that it tell you where you are on the globe, and if you’ve got a motorcycle [...]

Anyone who has used a great GPS system, including a great motorcycle GPS system, will know how user friendly and useful a good GPS can be. With modern GPS technology coming of age and modern digital mapping technology improving, a great motorcycle GPS can turn a ride into a pleasure.
What is GPS? For those who [...]