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2023Re: Tire and Wheel Information needed for 1974 Cadillac

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  • Versatile Couple in North Texas
    Mar 24, 2006

      I too have a 1974 Cadillac ProCar - Cerberus, a Superior Crown
      Sovereign Endloader/Combination. The commercial chassis uses the 5x5
      wheel and the tire size commonly being used to replace the 8.90-15 or
      N78-15 is the P235/75R15. I have upgraded my tires and actually went
      a little smaller on front and larger on the rear. I'm using BFG
      Radial T/A's and running P235/70R15 in front and P255/70R15 in the
      rear. I went with this combination to give my coach a slight "hot
      rod" rake and by going two sizes larger, I'm also gaining in the fuel
      economy department. Roughly, at 60 mph, I'm actually doing close to
      70 mph which allows the 472 to run at a lower rpm and still have the
      same speed as if I were actually doing 70. You're also open to
      running a slightly larger size front and rear if you're wanting to
      retain a completely "stock" look.

      The Hearse Guy in North Texas,

      --- In Cadillac_Performance_Association@yahoogroups.com, "Geary"
      <ghare@...> wrote:
      > I have 2 questions regarding tires and wheels for a 1974
      > Chassis. First, what is the bolt pattern for the wheels? I have
      > conflicting information saying that it is 4 ¾ inches and that it is
      > inches.
      > Second, what is the proper tire size for that car? The tire size in
      > the owner's manual and in the glove box is listed as 8:90-15. What
      > does that convert to in p-metric terms?
      > Thanks,
      > Geary
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