DCASonex wrote:Assuming those tires you mention are the larger 5.00 x 5 and not the small standard Sonex tires, 50 PSI is way too high for both the load and the capacity of the standard AUSA wheels which as I recall are rated for 35 PSI max. I have the 5.00 x 5 tires on my A series Sonex tail-dragger with a 3300 engine and have found 22.5 to 25 PSI to be about right with those. Had about 400 hours in 8 years on first set before replacing them, but using the cheaper and lighter 4 ply.
While one might think 50 PSI would exert the same force on the wheel regardless of tire size, the wheels also hold together the sidewalls of the tires and the force the side walls of the tires exert on the wheels increases as the side area of the tires increases, so even though 50 PSI may be okay with the small tires, it should not be used with the larger ones.
David A.
GraemeSmith wrote:Ply rating is a measure of load carrying - not thorn resistance (!!)
And modern tires are not really constructed with the extra plies implied in the rating these days anyway - so though they can carry a larger load - I'm not sure where you might get extra thorn resistance from.
That said - Goodyear Flite Specials do seem do have a better rubber compound and more of it than other brands. So perhaps that is why they perform better on the thorn resistance?
Do what the road bike guys do - Kevlar construction - though I haven't actually seen that for small GA tires. Anyone?
jaflint wrote:I run Goodyear Flight Custom III tires. 28 psi, over 1000 (tire) trouble-free landings on the current set.
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