i was just wondering how often do the wheel bearings need to be replaced.
im about to replace my rotors and wanted to know if anyone has replaced them.
got about 45k miles on the bike.

 

Also interested in this, had a front tire replaced last year and the guy said I should consider doing the front wheel bearing in the near future, bike's got 22k on it.

 

Replace when it starts to have problem like if you put your bike on the stand and theres play in the wheel.
In my experience normally only one of the few bearings in the wheel will break first, make lots of noise and have problem, and that the time to do all the bearing in that wheel.

 

so far there isnt any play in my wheel. thanks.

 

Pull the wheel put your middle or forefinger in the bearing and turn the bearing
if there's any kind roughness or anything less than totally smooth movement of
the bearing replace them - I'd have to say at 45k - best to do them anyhow