Got a ripped or otherwise damaged stem and don’t want to break down the tire bead to insert a new stem from inside the tire? We found what seems to be a quick, solid solution in the Colby Emergency Tire Valve System. It’s a replacement stem that slips into the valve stem hole in the wheel from the outside as shown here on this cutaway wheel. Once inserted, a wing nut is tightened to pull a tapered brass fitting up into a rubber seal that flares and makes an airtight mate to the wheel. Installation is quick and easy without dismounting or debeading the tire. The valve shown on the right is their emergency valve with the wing nut. On the left is their permanent valve version that installs using a brass fitting and hex nut to secure the valve to the wheel.