I'm getting ready to buy some E3's from dennis kirk, The only differance I can see between the mu- 90HB-16 and the mt-90HB-16 is width and load rating. The mu-90Hb- 16 being the wider and having a higher load rating. I cannot, However, find the front tire in the mu rating on dennis kirk's website. Just the MT rating. By the way the skins will be going on a 04 RK custom. I have been running Avon's, The second back tire I went with had a heavier load rating and I got better milage out of the tire. Any help would be appreciated.