I've got a 2006 Cannondale Synapse Carbon 2 with an FSA Integrated Headset. Bought it new, keep it clean/lubed/happy, don't ride it off curbs or over ski jumps, etc.
I rode it Saturday morning and it was fine as always. Got home, wiped down the chain, and hung it on the ceiling hook from the front wheel just like I've done after every ride for the last 3 years...
Sunday afternoon I take the bike down from the ceiling hook and immediately notice that the fork doesn't turn easily; it's really stiff, almost stuck, as if someone used epoxy instead of grease to lube the steerer. I went for a 50 mile ride and nearly killed myself going around slow sharp corners a couple times. The fork just doesn't turn in the headset, at least not without a lot of effort. If I stand the bike up on its rear wheel the fork does not turn to one side, like it normally does (on this or any other bike I've ever held).
What the heck happened?
The only slightly abnormal condition the bike has been through recently was two weeks ago when it was on the car rack getting driven through a two hour rainstorm...but I've put 150 miles on the bike since then and didn't notice any problem with the steerer.
I'm curious as to what may have caused this (since I obviously don't want to encounter it again). And of course I'm looking for a solution -- new headset bearings? Entirely new headset? New bike?