can anyone give me the correct tire pressure for 30 x 3 1/2 , i cant seem to find it anywhere

55 psig.

60lbs more or less no less that 55 or it may roll off the rim. The 21" 30 to 32 like a modern tire, it has a wire in the bead.
Alex

I never fill to above 55. Some are usually down to 40-45 by the time I think to check. Haven't rolled a tire off yet in near 100K miles. I run new tires until tread 90% gone. I don't trust old tires.

rdr

Oh, btw, I drive a fairly light 2-place T,

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but sometimes load it with 600 lb of cargo. If you have a heavy T, you may want to carry more air..