I'm not sure about the Zumo, but I do know that the Roadtech is water, dust, and shock resistant...supposedly it's protected a little sturdier for motorcycle use.
Doc
The Zumo has the same specs.

The main difference's is what Jerry (Ultrafxr) stated in Reply #1. Also regarding the preloaded dealer database that is provided in the Roadtech it can only be updated thru Garmin it is not a owner/operator database that can be changed like regular POI's (points of interest). Some have found recently in light of all the dealer closings that the preloaded database of dealers hasn't been up to date.

There is a member on the ZumoForums that has been great about keeping/updating a dealer database that can be loaded as POI's that is available in the download section of that forum.
NOTE: The before mentioned POI database available on ZumoForums will not update the factory dealer database that came installed on the Roadtech's. You can load and use them (if you have POI Loader), but you will end up w/two databases.

Ride Safe,
Fired00d
