What size tire came on the 1973 originally?
What size tire came on the 1973. I have a 73 that was my Aunt's and she changed the tires, but I need to replace them and want as close to what came from the factory as I can get?
That is tough. The original tires were bias-ply, and when radials came out, bias plys (and their unique sizing) went the way of the dinosaur. There's not a direct swap, but I would suggest something like a 225-75R15 for starters. Ask a local tire shop to be sure.
The 73 tire size is stated as GR70X15, 15", 70 Series. What I run on my 74 255/60/15 all around which is much wider then the original. As Littlehorn stated the 225/75R15 may be very close to the original dimensions.
The closes conversion is 225/70r15. You can find more information here: http://www.tirerack.com/tires/tiretech/techpage.jsp?techid=45
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