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Technical Tire pressure,Excelsior Stahl Radails

Discussion in 'The Hokey Ass Message Board' started by whitewallwilly, Dec 7, 2019.

  1. whitewallwilly
    Joined: Apr 2, 2012
    Posts: 176

    whitewallwilly
    Member

    I have just fitted a set of Excelsior Stahl Radail tires to my Model A coupe,this has made a unbelievable improvement to the handling ,
    the car weighs around 2600 lbs,
    Running 6:50-16 on the front and 7:50-16 on the rear
    I can't find any tire pressure recommendations,so I'm asking if anyone running a similar deal,what pressure front and rear are you running

    IMG_7790.jpg
     

    Attached Files:

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  2. andydodge
    Joined: Sep 28, 2008
    Posts: 935

    andydodge
    Member

    Ask who you bought them from........don't Coker do them?...........andyd
     
  3. swifty
    Joined: Dec 25, 2005
    Posts: 1,582

    swifty
    Member

    According to the Antique Tyres catalog-Aussie Dealer for Coker and others- your 6.50x16 are rated at 1580lbs@35psi and the 7.50x16 are rated at 2150@41psi. These are the design figures for your tires. I'm running American Classic radials on my 32 coupe which weighs 2850lb due to a very heavy Poly engine. They are rated about 400lbs less than the Excelsiors at 35psi and I run them at 30 psi. Try 30 and 35psi respectively and keep a close eye on tire wear- should be easy with no fenders LOL
     
  4. gassa-garage
    Joined: Jul 4, 2010
    Posts: 682

    gassa-garage
    Member

    Anyone try running these "tube type" radials without tubes ?
     
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  5. Kiwi 4d
    Joined: Sep 16, 2006
    Posts: 2,544

    Kiwi 4d
    ALLIANCE MEMBER

    I know coker say 41 psi Due to heat build up. I cant imagine running 41 psi in a light highboy giving a very pleasant ride , we run ours at around 30 psi , still gives the old kidneys a decent shake up .
     
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  6. The Shift Wizard
    Joined: Jan 10, 2017
    Posts: 1,586

    The Shift Wizard
    ALLIANCE MEMBER

    If the tires are rated @ 1500 pounds as mentioned, your curb weight is half that per tire (tyre :p ).
    You can air 'em up with low-ish pressure because at your weight, you won't get as much flex and heat build-up.
    I can't give you an exact pressure number because then I would be practicing engineering without a certification.
     
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  7. Blue One
    Joined: Feb 6, 2010
    Posts: 9,970

    Blue One
    ALLIANCE MEMBER
    from Alberta

    I have mine mounted without tubes but haven’t run them yet.

    I know there are plenty of guys running them without tubes.

    The rolling bones guys run them without tubes if my source of information is correct.
    And they run their cars hard and long distances too.
     
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  8. 55styleliner
    Joined: May 11, 2015
    Posts: 504

    55styleliner
    Member

    I have 5.00x16 Excelsiors on the front of my A Pickup and run those at 32psi. I have 7.00x16 rear Excelsiors and run those at 25psi. I have over 6,000 miles on them like that and there is no visible wear that would indicate that they are not properly inflated.
     
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  9. Aaron D.
    Joined: Oct 27, 2015
    Posts: 644

    Aaron D.
    Member

    Very similar setup, I'm running 26psi in the rear and 22psi up front.
     

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  10. Kiwi 4d
    Joined: Sep 16, 2006
    Posts: 2,544

    Kiwi 4d
    ALLIANCE MEMBER

    I imagine coker classic bias look radial would be the same pressure as excelsior for a same size tyre.
     
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  11. Almostdone
    Joined: Dec 19, 2019
    Posts: 43

    Almostdone
    Member

    One way to think about it is the percentage of the rated max that you have on each axle. Making up numbers, if your two tires on an axle are rated for a total max of 2000 lbs (1000 each) at 40 psi and your weight on the axle is 1200 lbs, you would put 1200/2000 = 60% of the max rated pressure in each tire, or 24 psi. Again, the concept is real, but I made up the numbers for the example. This method results in the proper tire footprint and wear based on the load. Use it on my 13,000 lb RV with good success.
     
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  12. Other brand radials and I run 25 lbs, check for overheating when ever I stop to stretch/use the can.
     
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  13. UNCLECHET
    Joined: Dec 3, 2002
    Posts: 1,038

    UNCLECHET
    Member

    I have a set on my Model A pick up hot rod. Right now I can't remember the pressure I run them at. But it's not much. I just start high and then start backing the pressure off until you can see the tire is using as much of the tread as possible. If you get too low the tire will start rolling over while cornering so you want to think about that. Also I usually have more pressure in the front than the back. Anyway, that's what I do. I think it helps the ride on light weight hot rods to do this.
     
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  14. Flamed48
    Joined: Apr 19, 2011
    Posts: 583

    Flamed48
    Member

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