CMP tyre manufacturers

[Alex van de Wetering]

Hanno,

I think the obvious answer is that there is no such thing as "the original" tyre manufacturer for CMP's. Both Chevrolet and Ford factory pictures show a varierty of tyre threads and brands. The Good year (Chevron thread, Sure grip) and Firestone ground grip seem plentiful, but you also see the Dunlop Track grip tyres, and also road and sand tyres made by Dunlop, Firestone, Good year and India.
Even when looking at rows of finished vehicles at the Ford and Chev plant, you'll note a variety of tyres in a line of the same type of CMP.

Alex

[Grant Bowker]

I agree that there wasn't a single "original" tire manufacturer for CMPs.

In comparing actual properties (as opposed to nominal sizes) the AEDB record mentions Goodrich, Gutta Percha, Seiberling, Dominion, Dunlop, Goodyear and Firestone as manufacturers.

Runflats seem to have been mostly made by Goodyear in the common CMP sizes with a few in "odd" sizes by Firestone and Dunlop".

Most sizes of regular pneumatic tires, both cross country and highway tread patterns, had multiple manufacturers.

[David Dunlop]

As happens today, as well, there were working relationships between auto makers and tire companies.

David

[Owen Evans]

For reference, An old Dominion Royal 'Trak Master' off my C15. Not so easy to read, so here goes:

Photo 1
DOMINION ROYAL
DOMINION RUBBER COMPANY
MADE IN CANADA
DOMINION ROYAL TRAK MASTER 1.jpg


Photo 2
FOR BRITISH WHEELS
9.00 - 16
10 PLY-PLUS
2 SHOCK PADS
RAYON
DOMINION ROYAL TRAK MASTER 2.jpg


The third photo shows the tread pattern....**NOTE** as per the below replies, it is believed that this tyre has been retreaded. So the pattern is likely not original.

Owen.

DOMINION ROYAL TRAK MASTER 3.jpg

[Grant Bowker]

I believe the Dominion tyre shown above is a retread - so the tread pattern to tyre make/model may not be original.

[Hanno Spoelstra]

Originally Posted by Grant Bowker

I believe the Dominion tyre shown above is a retread - so the tread pattern to tyre make/model may not be original.

Yes, you can still see the deep cleats of the original pattern on the sidewall.

[Owen Evans]

Originally Posted by Grant Bowker

I believe the Dominion tyre shown above is a retread - so the tread pattern to tyre make/model may not be original.

Hmmm. Thanks; that would explain why I have a Dunlop Trak Grip with exactly the same tread pattern on the other side of the truck.

[Mike Cecil]

During WW2, the Australian Government purchased from several tyre manufacturers:

• Dominion Rubber Co. - 9.00-16 and 10.50-20 cross country
• Dunlop Tyre and Rubber Co: 10.50-20 cross country
• Firestone Tyre Co cross country - size not specified
• B F Goodrich Rubber Co
• Goodyear Tyre & Rubber Co, including 9.00-16 RF and 10.50-20 cross country
• Seiberling Rubber Co: 10.50-20 12 ply cross country

Most orders specified 'casings, flaps, tubes', casings being the tyre. The tyre sizes listed above are most probably not the only sizes supplied by these companies, not are they the only companies from which tyres were purchased - these are just the ones I have ordering data on.

Mike

[Hanno Spoelstra]

Originally Posted by Owen Evans

For reference, An old Dominion Royal 'Trak Master' off my C15. Not so easy to read, so here goes:

Part 1/2: "Lukáš Lukáš" in the Czech Republic found a set of Dominion Royal Trak Master tyres recently. They are still in excellent condition showing many interesting details:

451875052_10222268088529994_4561778917353414526_n.jpg 451508487_10222268049529019_4394390515871264196_n.jpg


"DOMINION ROYAL
DOMINION RUBBER COMPANY
MADE IN CANADA
PATENTED CANADA"

451606016_10222268062289338_398349088713789775_n.jpg
451629178_10222268064249387_9013900937224649773_n.jpg


"TRAK MASTER"

451516968_10222268060889303_4581230864283701512_n.jpg

[Hanno Spoelstra]

Part 2/2:

"FOR BRITISH WHEELS
9.00 - 16
10 PLY-PLUS
2 SHOCK PADS"

451958854_10222268056289188_4078010166406120326_n.jpg


And this I have never seen before:

"FOR 1 1/2 [degree] TAPER RIM"

449435123_10222268065809426_6663082381638967558_n.jpg


"S2"

451515151_10222268058089233_7787138305910637519_n.jpg

[Mike K]

Originally Posted by Hanno Spoelstra

And this I have never seen before:

I've not seen that marking myself. Interesting it is 1 and 1/2 degrees. When looking at the British divided rims, the two halves have a pretty flat or level appearance, but apparently there is a 1 and 1/2 degree slope there.

The American system has tires that have the steeper bead angle , I believe this follows on from the normal commercial tire designs of that period.

Some people have reported as having no trouble with fitting the newer recently made ( Chinese ) tyres onto the British or CMP rims so it may be the case that some of the individual brands are allowing for the different tolerances. I spotted a CMP at Corowa with the Chinese tyres on it and spoke to the guy at length about tyres , he made no mention of having trouble with the fitting. He drove the truck across the Nullabor all the way from Geraldton.

Apparently the CMP C8A six stud rims will accept anything - US or British.

[Hanno Spoelstra]

Originally Posted by Alex van de Wetering

I think the obvious answer is that there is no such thing as "the original" tyre manufacturer for CMP's.

Indeed, there certainly wasn't just a single one, nor was there a preference of a certain car manufacturer for a certain tyre brand.
I hope this thread will help to catalogue at least a number of them.