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Customs 6.70-15 on '49 Cadillac - way too small or just a little too small?

Discussion in 'The Hokey Ass Message Board' started by 49_Caddy, Jan 30, 2017.

  1. 49_Caddy
    Joined: Mar 29, 2013
    Posts: 51

    49_Caddy
    Member
    1. GMB

    I tried searching and couldn't find a thread that specifically addressed this.

    Basically, I've come across a great deal on some used 6.70-15 WWW bias-plys and would like to replace the 235/75/15 Mastercraft skinny white radials on my '49 Caddy sedanette.

    Has anyone run a tire this small on a big ol' Caddy? I've got mine lowered approximately 3" and, even though they don't rub, I can't even get the current rears off or on without deflating them first.
     
  2. Los_Control
    Joined: Oct 7, 2016
    Posts: 707

    Los_Control
    Member
    from TX

    A quick search shows the 6.70 - 15 at 27.5" tall and the 235 - 15 29" tall.
    I would measure the height of your existing tires, then look at the 6.70 tires and measure them.
    I found when I was employed in the tire industry, you could take 2 different brand tires with the same size labeled on the casings, they would be different height.
    The only real way to match them were to physically measure or stand them side by side for reference.
    And for this reason, I take the internet search for a general guide and not fact.
     
  3. BJR
    Joined: Mar 11, 2005
    Posts: 6,511

    BJR
    Member

    I think they would be way too narrow and look funny. The stock tire size was 7:50 15.
     
  4. southerncad
    Joined: Feb 5, 2008
    Posts: 745

    southerncad
    Member

    Gotta' agree 6:70's on your Caddy would be way too small and look like your running 4 temporary spares :D
     

  5. Hnstray
    Joined: Aug 23, 2009
    Posts: 11,583

    Hnstray
    ALLIANCE MEMBER
    from Quincy, IL

    A bargain is no bargain if you can't use it. (without a compromise)

    As others above have said, the 6.70-15 is undersized for you Caddy, no matter
    minor manufacturer variances in given sizes. One other consideration is load capacity.

    However, as always, your car, your choice.

    Ray
     
  6. I'm pretty sure that Caddy came with 8.20-15's. That was the size of choice for the rears on our hot rod Fords if we were lucky enough to be able to afford 15" wheels.
     
  7. 49_Caddy
    Joined: Mar 29, 2013
    Posts: 51

    49_Caddy
    Member
    1. GMB

    Correct, 8.20-15 was stock size.
     
  8. Although you don't specify what MODEL Cadillac, the tire size commonly shown for the 1949 Cadillac is a 7:50 x 15 tire.
    6:70 x 15 will look small, will have a lesser load rating and will handle poorly.
     
  9. 49_Caddy
    Joined: Mar 29, 2013
    Posts: 51

    49_Caddy
    Member
    1. GMB

    Nope, 8.20 was stock for all the standard road cars (series 61, 62 and 60S) in '49. The Fleetwood 75 (limo) and the series 86 commercial vehicles were still based on the pre-war body and had 16" wheels with 7.50-16.

    tires.JPG

    Regardless, I think everyone is confirming what I suspected anyway - 6.70 is just too small for this car.
     
  10. YOU are more correct than I.
    The 7:50 x 16 was used on the 49-75. Others used the 8:20 x 15,
    See chart below from owners manual.

    Recommended Tire Pressures


    No. Pressure

    Series Tire Size Plies Front Rear

    49-61 8:20 x 15 4 24 lbs. 24 lbs.

    49-62 8:20 x 15 4 24 lbs. 24 lbs.

    49-60S 8:20 x 15 4 24 lbs. 24 lbs.

    49-75 7:50 x 16 6 24 lbs. 32 lbs.

    49-86

    (Commercial

    Chassis) 7:50 x 16 6 34 lbs. 36 lbs.
     
  11. 302GMC
    Joined: Dec 15, 2005
    Posts: 6,261

    302GMC
    Member
    from Idaho

    Nothing smaller than 7.60 would look or drive right. Cadillacs need the best quality tire you can afford.
    The 6.00 - 6.50 - 7.00 - 7.50 numbering sequence disappeared on 15'' pass. car tires somewhere around '48 to '50, but is still in use on 16'' pass. & truck sizes. The 15'' 6.70 - 7.10 - 7.60 - 8.00 - 8.20 number group is in place by 1950.
     
    jvpolvere1 and Hnstray like this.
  12. 40StudeDude
    Joined: Sep 19, 2002
    Posts: 9,430

    40StudeDude
    Member

    49_Caddy, that's the problem with lowering a car...

    Please post up a pic of your '49...I too have one only mine is a '48 sedanet...would like to see yours...

    Thanx,
    R-
     
  13. Dan Timberlake
    Joined: Apr 28, 2010
    Posts: 1,271

    Dan Timberlake
    Member

  14. 49_Caddy
    Joined: Mar 29, 2013
    Posts: 51

    49_Caddy
    Member
    1. GMB

    I don't always get the best response to pics of my car here on the HAMB, because of the crusty factor - but I like it :)

    Highland Park.jpg
     
    jvpolvere1, Hnstray and 302GMC like this.
  15. 40StudeDude
    Joined: Sep 19, 2002
    Posts: 9,430

    40StudeDude
    Member

    Nothing wrong with the 'krusty factor" IMHO...if they don't like it they can simply go to the next post...
    I sure do like it,all it needs are some wide whitewalls...FWIW, I have a good '48 rear bumper (no rust-thru) -I see yours has rust holes...I'd part with it for $200 plus the cost of shipping if you are interested...

    R-
     
  16. Have you tried to jack the car up, with a hydraulic floor jack, on the frame rail, just in front of the rear wheel ?
    BY doing so, you are stretching out the axle, from the frame and car body, thereby creating more tire clearance between the axle and the fender.
    I have a '51 Chevy, with reverse rims, which puts the sidewall of the tire very close to the flange of the wheel opening.
    The above is the only way I can slide the tire / rim out, without deflating the tire.
    It works for me, otherwise, I would be deflating the tire, as well.
     
  17. Ewwwwwwwwwww! Krusty!
    I've got 2 buddy's with '49 sedanettes and both of them are body-worked to death before being gloss painted. They'd quiver if they saw your car...lol
     
  18. 302GMC
    Joined: Dec 15, 2005
    Posts: 6,261

    302GMC
    Member
    from Idaho

    Wow ! nice Cad ... some gold '56 Sabre wheels, inchwalls, & paint the wheel wells red. Selling the sunbonnet would pay for everything.
     
  19. 49_Caddy
    Joined: Mar 29, 2013
    Posts: 51

    49_Caddy
    Member
    1. GMB

    Yeah, I have to go through that with the deflated tire! The Cadillac fender comes pretty low over the tire, you add 3" spring blocks and a tire that's significantly wider than stock and it just don't work.
     
  20. I had 8.20's on my 51 Cadillac hardtop and they looked a bit hefty. The standard size was 8.00 X 15.
    I have 7.60 X 15's on my 56 Fairlane, which is smaller that your 49 Cadillac, and it looks anemic.
     
    swissmike likes this.
  21. jvpolvere1
    Joined: Aug 19, 2016
    Posts: 176

    jvpolvere1

    I agree with 302 GMC. Buy the best you can afford and Master Crafts IMO are not them. Their only good for rolling your car in to or around the shop.

    Sent from my SM-T377V using The H.A.M.B. mobile app
     
  22. morac41
    Joined: Jul 23, 2011
    Posts: 532

    morac41
    Member

    Hi ..... I have 49 Caddy.... I run 7.20-15 BF Goodrich ....rides good..steers well ... I'm happy them...different maintenance manuals give different sizes to suit 49 Cadillac...


    m_IMG_4457.JPG
     
  23. 1946caddy
    Joined: Dec 18, 2013
    Posts: 1,703

    1946caddy
    Member
    from washington

    Pay for everything?
    I've got 4 Sabre wheels that cost me a $1000 and was quoted $ 750 each to re chrome and there are only a few people who have the correct equipment to do the job properly.
     
  24. southcross2631
    Joined: Jan 20, 2013
    Posts: 3,997

    southcross2631
    Member

    6.70's were on Chevys and fords which were lighter than Caddies. I would think that's not enough tire for that car. Might look and drive bad. Your car , buy them mount them up and look. If they don't look right and you got a great deal on them . You should be able to pass that deal on to someone else.
     

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