I am planning on taking my '09 ninja ex500r to alaska and want to get some all terrain tires for at least the back of the bike. I was wondering if there are any good tires in particular or whats the smallest tire I can fit without having to change my wheel width?

 

Have you checked over at the EX500.com site yet? There were some EX's made into dual sport rides a few times. I ride my pirelli sport demons, but they suck in the mud and dirt. First hand experience on that one. lol