CMP tyre 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]

Thanks Mike,

Not trying to be an anorak, but I presume the tyre sizes were denominated with an "-" rather than an "x"? A tyre specialist once told me a 9.00x16 is not the same as a 9.00-16, and that is was I see printed on the sidewall of tyres.

Just trying to get it right, especially if the information comes from primary sources.

Thanks,
Hanno

Originally Posted by Mike Cecil

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

Dominion Rubber Co. - 9.00x16 and 10.50x20 cross country
Dunlop Tyre and Rubber Co: 10.50x20 cross country
Firestone Tyre Co cross country - size not specified
B F Goodrich Rubber Co
Goodyear Tyre & Rubber Co, including 9.00x16 RF and 10.50x20 cross country
Seiberling Rubber Co: 10.50x20 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.

[Hanno Spoelstra]

Here are some pictures of a 10.50-13 tyre dated 7/1944, manufactured for the War Department by Henley's Tyre & Rubber Co Ltd. I had not seen this brand before.

img-13853-07013.jpg img-13853-07014.jpg img-13853-07015.jpg img-13853-07016.jpg img-13853-07017.jpg

PS: this tyre is for sale in Belgium, see https://www.generaaltjes.nl/Advertentie/13853/band

[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.

[David Herbert]

I wonder what "Shock Pads" are ?

David

[Grant Bowker]

This is a guess, maybe a bad one....
Possibly a reinforcing layer under the tread, either extra rubber or belts of cord (keeping in mind that most of the (high profile) tires of that era didn't need belts as part of their structure to remain in shape).