You can ride a Can-Am Spyder gently and slowly on gravel roads, but it’s best to limit this type of use to avoid damaging the sprocket or belt drive.
Rykers are better suited for gravel roads because they feature a direct drive system. The Can-Am Ryker Rally Edition has a unique tire design that's especially great on gravel. This model can be used on graded and smooth gravel, and even dirt roads. While it's not an off-road machine, it does open up the world of smoother dirt and gravel roads in more remote, less populated areas.