Joined: Feb 2013
Posts: 1,472
Likes: 11
From: Near St. Louis, Missouri
Bikes: Giant Defy Advanced, Breezer Doppler Team, Schwinn Twinn Tandem, Windsor Tourist, 1954 JC Higgens
Untreaded:
Look cool.
Sometimes more difficult for a pump to grip onto.
Threaded:
Not so cool looking.
The dorky kurl nut on a threaded stem can keep the tube from ripping while inflating with a pump. You don't push the valve into the wheels as much.
I've had long valve stems make a clicking noise. The dorky kurl nuts stop that sound.