Forum menu
I've got a FSA gravity 3 headset, and the bearings & races are covered in an oil rather than a solid grease.
If you can get grease into the bearings, go for it.
Otherwise grease any mating surfaces.
Smear a [b]bit of grease on all the cups and seal rings IMO, the rcaes themselves should be sealed but a bit of grease around the seal rings and outside wouldnt go amiss---stops creaking sounds (my carbon road bike recently sounded like it had a terminal break around head tube, a terrible grating sound when riding out of saddle; eventually I took all headset to pieces, greased around all cups, seal rings and now its absolutely silent again)
I have been told (by a chap who designs and sells bikes) that some headsets should be assembled dry (the one in question had cartridge bearings). I didn't believe it and greased the cups / bearing interface and over the top of the bearings.
AFAIK water and grit will get in there eventually, better they're coated with something to keep it out a bit longer plus it helps prevent metal to metal issues.