I built my first road bike from a Cannondale 2.8 series frame in January of 2007 and have put 3758 miles on it so far. When it was warm outside, I used to clean the bike every two weeks, but since it has gotten colder, it has not been cleaned more than twice in last 4 months. Even as of now, it has a lot of gunk on the drive train that I cannot clean probably until the weekend.

I guess the question I want to ask is, should I do a complete overhaul before the new season starts? I have done a complete cleanup in August for drivetrain and other parts, but haven't repacked hubs. How often do you guys do a complete overhaul? Is it necessary to regrease BB even if it is sealed cartridge type?

My rear wheel is laced to Ultegra hub and front wheel is a Ksyrium Equippe. When is an appropriate time to repack these hubs? Also, I have never done this, so if someone could post some pictures or point me to a tutorial, that would be great.

Edit: Also, my chain is slipping a little bit intermittently since past weekend. Is it possible that my cassette and chain are wearing out? Cassette is 105, 9 speed and chain is HG93. How many miles do you usually put on these components before you replace them?