Yeah I’d agree with most what you say about greasing fittings and especially trailer bearings. But since we all ride varying amounts, to say grease wheel bearings 2x per year is arbitrary. I guess I’m looking more for miles/to grease formula based on average riding conditions. I personally avoid mud and water if for no other reason than it’s easier to clean aside from the benefit of avoiding water in bearings.I believe that has a lot to do with where and how you drive. Dusty, Through a lot of water, mud, how many miles per year, etc.
If you had an older car you should repack your wheel bearings about once a year. Now you cant do that. I try to do my trailer bearings about once a year.
So I would think at least once a year or more frequently depending on above. I grease all my fittings about once a month and whenever I go on a long ride. Wheel bearings 2x per year. It gets easier the more you do it. Also gives me a chance to go over the whole machine to see what else is need of attention. As an example I did my buddies quad this spring and found his rear brake was loose. Interestingly enough was he just had it in the shop for a complete go over/tune up. This shows that they didnt look at that, or they did and didnt do the job properly either way, need to be tightened.
If you'd look at the bearing inner race it is two pieces. The greaser forces lubricant through that gap between the races into the bearing. Watch the video below.Gonna sound like a fool here but I just had my whole rear end apart, axles out and all that good stuff. My bearings are sealed. How you greasing them?