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34 x 7 at 12 ply Tyres/Tires Chevrolet 1940 Truck #1296848 01/30/2019 12:17 PM
Joined: Mar 2009 Posts: 38 Queensland Australia L Lionelgee 'Bolter
Lionelgee 'Bolter L Joined: Mar 2009 Posts: 38 Queensland Australia	Hello All, I have a 1.5 ton Chevrolet Truck that had was constructed in Australia in 1940. It is fitted with tyres that have 34 x 7 then 12 ply clearly written on them. Please see the attached photos of the tyres. The tyres are not serviceable - that is putting it very politely. The tyres were probably made when Methuselah was a baby. I checked online and I could not find any references to tyres with 34 x 7 written on them. Has the unit of measurement changed? If so what are the measurement now described as? Are these tyres still made and who would sell them? If the tyres are no longer available what more modern wheel rims and tyres would be a replacement for them? My apologies for all the questions. Kind regards Lionel Attachments Tyre 7 rubber specs.JPG (247.75 KB, 62 downloads) Tyre 1 Front.JPG (210.61 KB, 62 downloads) Last edited by Lionelgee; 01/30/2019 12:21 PM. 1940 Chevy 30 CWT (Holden Body) from Down Under

Re: 34 x 7 at 12 ply Tyres/Tires Chevrolet 1940 Truck Lionelgee #1296851 01/30/2019 12:39 PM
Joined: May 2005 Posts: 8,878 Lexington, VA G Grigg .
Grigg . G Joined: May 2005 Posts: 8,878 Lexington, VA	Tires are or were sometimes described by nominal outside diameter instead of rim size. Are they by chance 20” rims, measured where the tire bead seats or contacts the rim? looks like it to me. •1951 GMC 250 in the Project Journals •1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes •1952 Chevrolet 3800 pickup ---All pictures--- "First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-

Re: 34 x 7 at 12 ply Tyres/Tires Chevrolet 1940 Truck Grigg #1296854 01/30/2019 1:06 PM
Joined: Mar 2009 Posts: 38 Queensland Australia L Lionelgee 'Bolter
Lionelgee 'Bolter L Joined: Mar 2009 Posts: 38 Queensland Australia	Hello Grigg, Thank you for the reply. I sent a similar post on a Military Vehicle Restoration forum and they informed me that 34 x 7 was replaced in 1951 by the markings of 7.00-20. Apparently that size is now very uncommon. I was advised to attempt to find the more common 7.50-20 tyres instead. Does this make it any easier to track down a supply of tyres in the US of A? Kind regards Lionel 1940 Chevy 30 CWT (Holden Body) from Down Under

Re: 34 x 7 at 12 ply Tyres/Tires Chevrolet 1940 Truck Lionelgee #1296870 01/30/2019 2:22 PM
Joined: May 2005 Posts: 8,878 Lexington, VA G Grigg .
Grigg . G Joined: May 2005 Posts: 8,878 Lexington, VA	Sounds like you've got it figured out. 7.50-20 are still common enough. 7.00-20 are also still available http://www.millertire.com/products/.../7-00-20-firestone-truck-hwy-rib-10-ply/ look there for other sizes too, also try these people https://www.universaltire.com/truck-and-military.html •1951 GMC 250 in the Project Journals •1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes •1952 Chevrolet 3800 pickup ---All pictures--- "First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-

Re: 34 x 7 at 12 ply Tyres/Tires Chevrolet 1940 Truck Lionelgee #1296926 01/30/2019 8:13 PM
Joined: Jun 2011 Posts: 5,096 Longmont, CO E EdPruss Crusing in the Passing Lane
EdPruss Crusing in the Passing Lane E Joined: Jun 2011 Posts: 5,096 Longmont, CO	If one doubles the 7 of the 34 X 7 designation, subtract it from the 34, you come up with the 20. All old time tires are measured this way. Ed '37 GMC T-18 w/ DD 4-53T, RTO-610, 6231 aux., '95 GMC running gear, full disc brakes, power steering, 22.5 wheels and tires. '47 GMC 1 ton w/ 302, NP-540, 4wd, full width Blazer front axle. '54 GMC 630 w/ 503 gasser, 5 speed, ex fire truck, shortened WB 4', install 8' bed. '55 GMC 370 w/270, 420 4 speed, grain, dump bed truck from ND. Works OK.

Re: 34 x 7 at 12 ply Tyres/Tires Chevrolet 1940 Truck EdPruss #1297006 01/31/2019 10:09 AM
Joined: Mar 2009 Posts: 38 Queensland Australia L Lionelgee 'Bolter
Lionelgee 'Bolter L Joined: Mar 2009 Posts: 38 Queensland Australia	Hello Grigg and Ed, Thank you for the information and the links. I suppose it makes sense that the Chevrolet is an American brand so there is wider selection of tyres there. Kind regards Lionel 1940 Chevy 30 CWT (Holden Body) from Down Under

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