Just curious what the difference between the MM lobes and the XX lobes? I read the catalog descriptions, but looking for more detailed information. Design and actual intended useage difference as well as difference in spring requirements and maintenance. When i saw this post, i immediately thought i run this lobe family in my rb 505, but when i went to confirm, i saw it is the XX lobes. So curious about that info.


1.50 60Ft. , 10.75@ 127MPH Hauling 3900 LBS.