I know what the numbers mean that is not the question. The correct tire to run on the rear is a 110/90-19 right? I wanted to get a new rear tire and was going to try a M12, but Rocky Mountain doesn't offer any of their tires in that size. What is the deal. I love Rocky and have had great results with their people so I want to keep using them. This is off the web site too though. Anyway are you guys running this size of tire or have you switched tire size?