correct tire size

Discussion in 'Buick FAQ' started by Beau, Feb 11, 2020.

  1. Beau

    Beau Brad

    I have a 70 GS455.When I bought the car it had P255 60R 15s all around.The front tires rubbed in the front when turning into a driveway.The car does have the correct 15" chrome wheels.Who can tell me the correct size tires for the front?I will leave the tires on the rear as they do not rub obviously.
  2. mrolds69

    mrolds69 "The Cure"

    Brad, I'm not going to throw out radial sizes because I'm not sure what works. My 70 has 15's (WG's) with G60's and they don't rub, not even close. I do know there were different front wheel moldings that could cause rubbing in 70 with 15's. There was a regular molding that could rub. Then there was a "scalloped" type molding that didn't rub.
  3. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD"

    The optional tire that came on the 70-72 GS was a G60-15. The closest modern size to that is the P245/60R-15.
  4. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD"

    I have 255's on the front of my GS and they do not rub. There are other factors in play though. Some cars are lowered or have sagging front springs.
  5. Beau

    Beau Brad

    I have new springs and shocks yet to be installed.Some sag could be possible.Coker salesrep recommended P225 70r 15s.Seems to be more than one correct answer.I had a new 70 GS 455bin 1970 with G60 15s and didn't rub.
  6. flynbuick

    flynbuick Super Moderator Staff Member

    The Coker salesperson has no clue except for what he sees on a computer screen.
  7. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD"

    No, there is NOT more than one correct answer.

    P245/60R-15 is the closest to a G60-15. Lets compare tire sizes,

    A G60-15 had a section width of 9.70" and a tire height of 26.44"

    The P245/60R-15 has a section width of 245mm ( 9.65") and a tire height of 26.6"

    The P225/70R-15 has a section width of 225mm (8.86") and a tire height of 27.40"
    Last edited: Feb 12, 2020 at 10:21 AM

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