I have to do a sharp hairpin corner (uphill) on a pedestrian/bike overpass bridge near me. (The one over 155th/Aurora/Westminster on the Interurban for you Seattlites)

It is a bear.

It seems to work best if I drop into my absolute lowest gear well before the hairpin, pedal like a demon, and then coast around the corner with my outside foot down and not moving a muscle until I'm through.

Then I pedal like a demon again and start shifting up.

Not an elegant solution, but it seems to be the only way I can get through without walking or scooting. (Which I will also do at times, especially if the person in front of me walks. You really can't pass on this hairpin because of the folks coming down off the bridge.)