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  #1  
Old 05-07-16, 03:22
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Also, the Wartime 10.50-20 tyres were replaced post-war with 11.00-20, but it seems to be just a name change as dimensions and ratings remained the same.

And 9.00-16 and 9.26-16 tyres have identical carcass dimensions, but the 9.00 size is for "British" rims, while the 9.25 is for the tapered seat rim used on the C8A and Lynx, aka "American" rim.
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Old 06-07-16, 08:55
lynx42 lynx42 is offline
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Quote:
Originally Posted by Tony Smith View Post
Also, the Wartime 10.50-20 tyres were replaced post-war with 11.00-20, but it seems to be just a name change as dimensions and ratings remained the same.

And 9.00-16 and 9.26-16 tyres have identical carcass dimensions, but the 9.00 size is for "British" rims, while the 9.25 is for the tapered seat rim used on the C8A and Lynx, aka "American" rim.
Tony, Not to sure you are right to say the carcass dimensions are identical. The Lynx 9:25 tyres are a low profile tyre and are many inches smaller in diameter than the 9:00 tyre. I have been told that the extra:25 is actually the width difference of the tread.

Here is a photo of my new 9:00x16 tyres next to a slightly worn 9:25x16 tyre off my Lynx. You can see the 9:00 is taller and also narrower than the 9:25 tyre.

Lynx Continues Tyres 024.JPG

The new 9:00x16 tyres did drop onto the Lynx rims very easily.

Regards Rick.
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  #3  
Old 06-07-16, 10:31
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Originally Posted by lynx42 View Post
Here is a photo of my new 9:00x16 tyres next to a slightly worn 9:25x16 tyre off my Lynx. You can see the 9:00 is taller and also narrower than the 9:25 tyre.
The new 9:00x16 tyres did drop onto the Lynx rims very easily.

Regards Rick.
It's not equivalent to compare modern production tyres with wartime production. By far, the bulk of modern 9.00-16 tyres are made to different cross section shapes to WW2 tyres, and virtually all are of the "American" or 5 degree bead seat design.

I do have 2 WW2 Canadian 9.25 tyres and the carcass size is the same as Canadian and English 9.00-16 tyres I have. However, both 9.25s are from different manufacturers and while the tyre widths are the same, the tread widths are different

I also have two near-new Australian made 7.50-16 bar tread tyres (from Land Rovers) which are over an inch in difference in diameter. The point I am trying to make is that tyre sizes are indicative or nominal, and are intended to provide more information than simply the physical dimensions.
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Old 06-07-16, 10:46
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Also, the 9.25-16 sizing seems to only be a uniquely Canadian idea. English-made tyres (WW2 production) for 5 degree bead seat are designated "9.00-16 for American Wheels".
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Old 06-07-16, 11:05
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I believe the 9-25 X 16 was also used on British Humbers , the 4X4 FFW PU and the Box ?

I tend to agree with Rick, the 9-25's had a lower profile ( nothing to do with brands ) and this low profile was a deliberate design spec. .
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Old 06-07-16, 12:51
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Hi

This is interesting considering we were all feed the line over the years that the Allies won because they standardised everything and the Axis lost because they could stop inventing and re-inventing things. And yet here we are with two tyres which on the surface would seem too close to one another i.e 9.00 and 9.25 to bother with, yet they did it and produced both. Can't imagine in the heat of battle and looking for a spare tyre I'd have been too choosie!, not like I'm going to be stopped for a roadworthy as I'm rushing forward from El Amein or worst back from Tobruk!!
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Old 06-07-16, 19:53
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Quote:
Originally Posted by Mike Kelly View Post
I believe the 9-25 X 16 was also used on British Humbers , the 4X4 FFW PU and the Box ?

I tend to agree with Rick, the 9-25's had a lower profile ( nothing to do with brands ) and this low profile was a deliberate design spec. .
Hi Mike,
Quite correct, and the Humber Scout Car was also on Runflat 9.25-16 tyres. I have driven a Humber Scout on 9.00-16 and it is considerably more high geared due to the increased circumference. Especially awkward when trying to get it up on the neck of a low loader semi-trailer.
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Old 07-07-16, 22:18
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Hi

So what was the reason for 9.25 x 16 versus 9.00 x 16 surely when they were trying to keep rubber use to a minimum one tyre would have been easier to produce, Was it something to do with weight carrying capacity, they were both off road tyres right, so there would have been no need for different performance characteristics surely. Was it something to do with the 'run flat' requirement on armoured cars etc.

regards

Matt
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Old 06-07-16, 19:37
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Quote:
Originally Posted by Tony Smith View Post
Also, the Wartime 10.50-20 tyres were replaced post-war with 11.00-20, but it seems to be just a name change as dimensions and ratings remained the same.
As posted before, this actually was a wartime change - see the bold quote:

Quote:
Originally Posted by Hanno Spoelstra View Post
Indeed. I have even seen a tyre sidewall marked "11.00-20 replaces 10.50-20". I have since learned this was a "new alternative size marking" for the 10.50-20 tyres listed in the wartime Data Book of Wheeled Vehicles, so it must have been a wartime change.

Interestingly, while this tyre originally had Dunlop TrakGrip tread, it was recapped at least twice, the last time with NDCC bar tread.
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