[Land-speed] Tire Valves

[Joe Timney]

Wall thickness concerns...add two bosses, 180 degrees apart on the 
inside of rim, drill and tap one and balance the rim before adding the tire.

Kirkwood wrote:
> Thanks for all the comments so far. JT's comment got me thinking so I ran a
> few numbers. My rims will be steel and either about .160'' or .190''
> thickness. The vendor has mentioned both thicknesses! The 1/8 NPT is 27 TPI
> making a thread about .037'' wide. So if I have the .160'' thick rim it will
> engage about 4 threads. The nominal diameter of the thread is .405'' and  at
> 70 psi tire pressure there would be a blow-out force of about 9 lb. I doubt
> that pressure is as big an issue as centrifugal force. But it is a force
> applied in the correct direction! Centrifugal force is forcing the valve
> into the rim and not out. If the rims are thicker then obviously more
> threads would be engaged. As a first look, forces appear to be within
> reason. But more about Dave's comment next  . . .
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