16" 8 bolt Split Rims for 1.5 ton Australian Chevrolet Trucks

[Philippe Jeanneau]

Looking for information, specifically the width and backspace of the 16" (8 bolt) split wheels fitted to 1.5 ton Australian Chevrolet trucks between the years 1940-1945. The posting below is from February 4th. Thank you.

https://www.facebook.com/groups/66266488488/

[Tony Smith]

I know you've already asked these questions repeatedly before, so I'm not sure what further information you are expecting..

The 30Cwt CMP , MCP and 1533X2 trucks are all standard Canadian designs and the 16" rim is the the common 16x6.0 design used by the WD/DND (ie Universal to Ford, Chev, Morris, Bedford), not just Australian trucks.

[Philippe Jeanneau]

Indeed I have, but I have only obtained some of the information, so I hope that if I keep asking someone else might pick up the fact that the backspace on these wheels is still a mystery... Mind you, I have asked for the backspace and not the offset...

[Andrew H.]

What do you mean by "back space" and "off-set"? These are not terms I am familiar with.

[Lang]

Here is the definition explained

https://www.tyresizecalculator.com/w...el-backspacing

[Andrew H.]

Does this photo help? These are the 16-inch split-rim wheels on our LRDG 1533X2 truck.

[Hanno Spoelstra]

Originally Posted by Philippe Jeanneau

Looking for information, specifically the width and backspace of the 16" (8 bolt) split wheels fitted to 1.5 ton Australian Chevrolet trucks between the years 1940-1945. The posting below is from February 4th. Thank you.

https://www.facebook.com/groups/66266488488/

Here are Philippe's pictures:
51412413_10213615338878336_2937104907104157696_n.jpg 51407547_10213615344998489_523306550580740096_o.jpg 51228093_10213615380239370_2322467148284297216_o.jpg 51116992_10213615383999464_4417937531148959744_o.jpg
51558868_10213615361758908_2431539492033658880_n.jpg

Source: https://www.facebook.com/groups/6626...7100302738489/

[Bob Carriere]

Regarding the 6 stud wheels used by the HUP and now I learn also by the Dodge axles of RHD drive Canadian made trucks.

There are some slight differences wed have observed..... the six stud wheels MUST have a different taper than a regular CMP 8 bolts version......as the 900x16 tires do slip down easier than the 5 degree C15a rims.

The six stud wheels/rims I have seen all have the Kelsey-Hayes stamping which includes the date of manufacturing.

It also seems from comparing GM parts listing that the early first 200 Lynx Mk I also shared the six stud brake drum on the front axle.

Comments????

[Bob Carriere]

Thanks Tony for clearly highlighting the differences of the six bolt rim.

[Bob Carriere]

The famous Australian rim was therefore an 18 inch rim of similar concept/design made by stamping two halves in 1/4 inch steel plate.
Do we know who made them??? and probably sourced in Australia. Were they stamped by the maker like the Kelsey-Hayse rims.

Second question.... concerning the origin of the brake drum posted last in Hanno's posting........... I have a similar picture taken from the wrecks of North Africa...... attached...... from the picture I have concluded that it is a Chevrolet chassis from the cleanly sand blasted sheet metal, indentation on the frame for locating a LHD steering box and the spring layout. The fender seems to indicate an earlier version of LRDG using a 38-39 or 1940 round fender model.......

Does any one have a larger picture depicting that same vehicle but in larger format showing the cab style. So far I have not been able to find any references in GM part manuals for that elusive riveted brake drum and I have many.......

Thanks

Bob C.

[Mike Kelly]

Originally Posted by Bob Carriere

The famous Australian rim was therefore an 18 inch rim of similar concept/design made by stamping two halves in 1/4 inch steel plate.
Do we know who made them??? and probably sourced in Australia. Were they stamped by the maker like the Kelsey-Hayse rims.

Bob C.

The manufacture of the Chev 18" split rims is mentioned in the GMH 'War Record' book. My understanding is, GMH made the rims themselves , GMH had a huge press for the job . Don't know where Ford Australia got theirs from . Anybody know ?

[Tony Smith]

Originally Posted by Bob Carriere

Second question.... concerning the origin of the brake drum posted last in Hanno's posting........... I have a similar picture taken from the wrecks of North Africa...... attached...... from the picture I have concluded that it is a Chevrolet chassis from the cleanly sand blasted sheet metal, indentation on the frame for locating a LHD steering box and the spring layout. The fender seems to indicate an earlier version of LRDG using a 38-39 or 1940 round fender model.......

This is not necessarily a LHD vehicle, in fact it is more likely not to be.

Canadian Built Ford, Chev and Dodge vehicles have the mountings for both RHD and LHD steering boxes on the chassis, even the CMP, although no-one has ever forund a LHD steering box that will fit a CMP chassis!

[Hanno Spoelstra]

Originally Posted by Bob Carriere

Regarding the 6 stud wheels used by the HUP and now I learn also by the Dodge axles of RHD drive Canadian made trucks.

Dodge T-212 8-cwt truck only. The MCP 15-cwt’s have the same 8-bolt WD split rim as CMP 15-cwt trucks.

here are some slight differences wed have observed..... the six stud wheels MUST have a different taper than a regular CMP 8 bolts version......as the 900x16 tires do slip down easier than the 5 degree C15a rims.

The six stud wheels/rims I have seen all have the Kelsey-Hayes stamping which includes the date of manufacturing.

It also seems from comparing GM parts listing that the early first 200 Lynx Mk I also shared the six stud brake drum on the front axle.

Comments????

The six-stud CMP wheel was used on 8-cwt trucks. It doesn’t have a different bead taper, it simply has a smaller diameter as explained in Mike’s thread here:
http://www.mapleleafup.net/forums/showthread.php?t=1594

HTH,
Hanno

[Grant Bowker]

Hanno,
I haven't measured the two types of Canadian 16" rims to confirm actual size and shape but what you are saying ("The six-stud CMP wheel was used on 8-cwt trucks. It doesn’t have a different bead taper, it simply has a smaller diameter") is in conflict with the AEDB design record that states the rim for use with 9.25-16 tires has a 5 degree rim base taper and the rim for use with 9.00-16 and 10.50-16 tires has a 1-1/2 degree taper. The AEDB record doesn't give a diameter at the bead seat other than the nominal 16".

Mike's measurements (taken from tires) show both a smaller diameter and a greater taper (assuming the tire wall was of similar thickness at the bead seat) for tires intended for use with the "American" rim.

[Tony Smith]

Originally Posted by Hanno Spoelstra

The six-stud CMP wheel ....... doesn’t have a different bead taper, it simply has a smaller diameter ...[/url]

It actually HAS BOTH.

[Hanno Spoelstra]

Originally Posted by Grant Bowker

I haven't measured the two types of Canadian 16" rims to confirm actual size and shape but what you are saying ("The six-stud CMP wheel was used on 8-cwt trucks. It doesn’t have a different bead taper, it simply has a smaller diameter") is in conflict with the AEDB design record that states the rim for use with 9.25-16 tires has a 5 degree rim base taper and the rim for use with 9.00-16 and 10.50-16 tires has a 1-1/2 degree taper. The AEDB record doesn't give a diameter at the bead seat other than the nominal 16".

Grant, thanks for correcting me in that the rim base taper differs between the 6-stud and 8-stud WD split rim. Good to see you quoting the AEDB Design Record, it is those primary sources which we need to refer to more often.

I made that remark as most people think only the rim base taper is different, which isn't true - see Tony's remark below. A 3.5 degree difference in rim base taper would go unnoticed when fitting a tyre. A larger rim diameter does.

Originally Posted by Tony Smith

It actually HAS BOTH.

Thanks for clearing that up, Tony.

Hanno

[Tony Smith]

Originally Posted by Philippe Jeanneau

Looking for information, specifically the width and backspace of the 16" (8 bolt) split wheels fitted to 1.5 ton Australian Chevrolet trucks between the years 1940-1945.

But all of these are 10 bolt rims?