Depends on maintenance and care. I repack and inspect my bearings in the beginning of every year when getting ready for the season. I think that I have replaced two if them in 14 years. Typically just the seals. Thtis way I can see everything, brakes etc and just dont give it anther thought for the rest of year. When I stop for gas I do feel the rims and tires to see if they are hot or if one is hotter than another. So far never happened, but if one wheel is hotter than the other that wold make me pull the tire and hub to see whats happening.
