I have an 06 Heritage and I've been reading the posts on the E3 tires and still cant figure`out the right size for the rear. The front is easy as they have an mt90B16 in the e3 but the rear the closest I can come is the mu90b16 which is narrower than the stock 401 rear. Is this what you guys are running or are you stepping up to the next size and how does it fit. Thanks for any feedback.