Trying to answer my own question...

 

I found a Goodyear document, Aircraft Tire Data Book.

 

 

Plenty of data, but I did notice that you add 4% to the unloaded inflation number to get the loaded inflation number.  That's only 1-2 PSI on our planes.  But the 6.00x6 6 ply Flight Special II is listed at 42 PSI, the 6.00x6 6 ply Flight Custom III is also listed at 42 PSI.

 

The 5.00x5 6 ply tires are all rated at 50 PSI.

 

I think those are the Goodyears that are on Lancairs.

 

I guess if you add the 4% you get pretty close to the 45/55 that I have been using, and what other guys have recommended.

 

But I have the Condor tires!

 

???

 

Mike