Paul,
Thanks!  I printed out your table and graph.  It will help me determine the correct pressure for our trike and bike tire pressures.
Richard

Quote from Ric_Clark on Jun 8^th, 2011, 9:36am:

 
Ric, it's not the diameter of your wheels that matters, it's the width of your tires...  I'm going to assume that you're running 1.25" (32mm) tires.  If your weight was evenly distributed between all three wheels, that would be ~90 pounds of load, so you find where the 32mm line intersects with the 90 pound column, and look to the left for pressure -- in this case, around 52psi.  If you're running 1.1" tires, it's 65-70 psi.
 
HOWEVER, your weight isn't evenly distributed among all three wheels - but with a trike, it's easy to put a bathroom scale under each wheel and have someone else read it as you sit in the trike...  Your rear wheels should have equal weights, but may be different than your front.
 
Let us know what you find out!  Remember, this is just a recommendation of starting pressure -- modify it as your mileage varies...  but I am still running my front 1.1" tire on the Xstream at 80psi instead of 110...

[quote author=jayg link=1305525859/15#18 date=1307580492]Quote from FlyingLaZBoy on Jun 8^th, 2011, 3:39pm:

 
True, but that amount of difference is no doubt irrelevant for what we're talking about, here...  especially since my "heavier weights" chart is just my own extrapolation of the original data anyway!!!  If my "engineering statics" math is correct, having one wheel on a scale would create about a 3-4 degree angle, tops, changing the effective weight by only a percent or so...  or as Bob W said, "much ado about...."  

Quote from FlyingLaZBoy on Jun 10^th, 2011, 8:51am:

 
 
Quote from jayg on Jun 10^th, 2011, 5:17pm:

 
 
Nice to know I've still "got it"....