🚀 go-pugleaf

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I want to find out the of meaning tire and battery specifications,
particularly the specifications that I found in the owner's
manual of my 1967 Buick.

1.  Tire.  The owner's manual describes the tires as 8.45 X 15.
    I have been told that the suspension used is not set up
    for radial tires so bias ply tires should be used.  One
    store said to use G78/15's and one store said to use H78/15's.
    Which is correct and what do the numbers and letters stand for?
    I assume the 15 is for 15 inch rims.  Is the 78 a ratio of
    some dimensions?  Is the H a larger tire than a G?  If so
    in what dimensions?

    Both stores discussed Kelly Springfield tires for about $200 or
    a little more for four tires mounted and balanced.  Are these
    good tires or should I consider Firestone or Goodyear?

2.  Battery.  The owner's manual has the following specification
    for the battery:

	 Delco Y71 - 3000 watts @ 0 degrees - 70 amp.
	 Hrs. @ 20 Hr. Rate

    If I buy a sealed battery what exactly are the pertinent
    specifications to use?  Could I buy a somewhat more powerful
    battery than that specified in the owner's manual?

Thank you very much.

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