What is a typical tire pressure for a 16" x 650 or 700 tube tire?

 

If they are bias ply "highway" tread (ribbed), you can't go much wrong with 32. After they knock your teeth out at that, you can play with lower pressures (depending on load). The info may be on your data plate in the glovebox. A good trick is to drive thru a small puddle onto dry concrete and see if the full width of tread is hitting the ground. Lower/raise pressure until you find that point. Higher pressures will lift the edges of the tread on bias ply.

 

Here are the tire specs from the salesmans handbook:

 

Interesting thing about this chart is the great difference between front and rear pressures, ie 10psi differential.

 

It's the load Jon Finn, The load.