I recently purchased a Trek 7200FX Hybrid that came with a stock Shimano TX71 48/38/28 crank. I'm assuming the BB is sealed so nothing such as repacking needs to be done. Is this true? Also I went online to find technical information such as schematics or exploded view diagrams, but I must say manufacturers aren't very forthcoming with info? Seems none of the components model numbers match up with any on their websites. For example: I go to the shimano website to find crank info for the TX71, punch it in, and nothing comes up but the c101,c102, nexave? If I go to the Bontrager site and punch in Ahead headset nothing. I'm wondering maybe these are cross-reference numbers or trade names or something? Just seem to be lost in the technical superhighway, so I figured I'd stop and ask for directions.

Current stuff is cartridge BB.Even not so current is.

Your 7200FX is a 2005 model right? Could be that the TX71 is so new that Shimano hasn't updated their online info about it yet. Likely the BB is a cartridge and probably not even from Shimano. Most people don't care what brand the BB is, and since you don't really see much of it, that's where manufacturers can save cost. Same with the headset. Aheadset is a generic (used to be a trademark and maybe still is) term for threadless headset. I could be made by any number of manufacturers.

Thanks all. Guess I'll just have to see if the site gets updated, nd yes it is a 2005. Shoulda mentioned that!