Hey guys I am running 27" mud dogs on my Rhino and find that it is hard on bearings. I have about 4000 km's on it and I am changing the front for the second time and I need to do the back. The first time I did the front I used all balls kits. I just change the right front again but this time I took the time to drill and tap a hole in the bearing housing at the front on the inside so that I could put a grease fitting. It seems to work great. I know that technically you shouldn't over pack a bearing because they will heat up but getting out the dirt and water will probably make them last longer. I will be putting on my tracks for the winter soon. I am sure they put a little more pressure on the bearing too.