Plus you need to change the air for different seasons. Winter air is not good for summer riding.I check my bearings every time I change the air in my tires. (It was a pita A** to find the rear wheel bearings)
I get better mileage with fresh air in the tires.. (Stale air makes the bike ride Wicked hard over deep pot holes)
Was thinking about why there are such disparate results for front wheel bearing lifespans on GL1800s. Could it be how they are ridden? I wonder if these high-mileage experiences come from owners who primarily ride interstates/freeways, with minimal heavy loading from hard braking, hard cornering etc. and all the twisting and pressure that comes from aggressive, sportbike kind of riding in the mountains? I don't know anything about what contributes to or reduces lifespan of sealed ball bearings, but it would seem that steady-state operation from highway cruising would be as ideal a life for a bearing as can be. Fred, based on observations in this area, can you draw any conclusions?It's impossible to predict how long they will last. Honda uses a double bearing set up using good quality Japanese bearings so they should be good for a long time. If you do replace them, stick with OEM Honda bearings. If I had to put a mileage number on when to replace them, I'd say between 80-100K miles, but they could go longer or fail earlier.
Not a routine maintenance item. They should be changed if/when they need changing. Riding style, road conditions, extreme environmental conditions, slight manufacturing defects in material or workmanship, wheel roundness, tire maintenance and balance, shock-and-spring conditions, and more, all can effect wheel-bearing longevity.