Originally Posted by
davidad
The sidewall pressure is 1/2 that which will blow the tire off of the rim.
Do you have an industry source for that statement? While on the surface it sounds logical, I think that it's part of the bicycling mythology.
All rims aren't the same. Sheldon Brown (who has repeated that statement on his website) also has a chart listing appropriate rim width vs. tire width combinations. If the "1/2 blow off pressure" staetment were true, there'd have to be a test rim associated with it.