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What year did the rim center circle change?
#1387066 Fri Dec 04 2020 07:14 PM
Joined: Oct 2019
Posts: 296
T
Tony292 Offline OP
Shop Shark
Question: what year did the rim center circle change from 4.75 to 5.25?

Re: What year did the rim center circle change?
Tony292 #1387098 Sat Dec 05 2020 02:00 AM
Joined: Jun 2011
Posts: 3,915
E
Shop Shark
Late ‘50’s with the change to tubeless tires, however as early as ‘55 on tube type tires.

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: What year did the rim center circle change?
EdPruss #1387125 Sat Dec 05 2020 05:16 AM
Joined: Jan 2008
Posts: 4,698
C
Shop Shark
I have found the 4.75 on Advanced Design and 5.25 on Task Force. This coincides with GMC New design and Blue Chip. The break was mid year 1955

Re: What year did the rim center circle change?
Tony292 #1387175 Sat Dec 05 2020 07:32 PM
Joined: Dec 2002
Posts: 2,589
S
Shop Shark
1954 was the first year for the 5.25 rim center circle. Photo from 1954 Chevrolet Truck Engineering Features Book.

Attached Files
20201205_145420.jpg (264.15 KB, 111 downloads)

Spanky Hardy
Collector Of Fine Old G.M. COE Trucks & Antique Holmes Wreckers

1948 Chevrolet 5700 COE Holmes HD W35 Wrecker
In the Stovebolt Gallery
More pictures on Photobucket

1950 GMC 250 1-Ton
In the Stovebolt Gallery
Re: What year did the rim center circle change?
Tony292 #1387249 Sun Dec 06 2020 05:24 AM
Joined: Jan 2008
Posts: 4,698
C
Shop Shark
They may have been in Engineering books, but I'm not so sure they were available in 1954. The New Design GMC 350 in the picture still has the smaller bolt circle. And I really doubt that Chev got anything before GMC.

https://photos.app.goo.gl/ru9LRsriYHhuwtTc7

Re: What year did the rim center circle change?
Tony292 #1387276 Sun Dec 06 2020 03:44 PM
Joined: Dec 2002
Posts: 2,589
S
Shop Shark
Trust me Kenneth, I've owned several 1954 Chevrolet 2 ton Conventionals, and COEs, and they all had the 5.25 center bolt circle.


Spanky Hardy
Collector Of Fine Old G.M. COE Trucks & Antique Holmes Wreckers

1948 Chevrolet 5700 COE Holmes HD W35 Wrecker
In the Stovebolt Gallery
More pictures on Photobucket

1950 GMC 250 1-Ton
In the Stovebolt Gallery
Re: What year did the rim center circle change?
Tony292 #1387301 Sun Dec 06 2020 06:25 PM
Joined: Dec 2002
Posts: 2,589
S
Shop Shark
1954 COE front wheel, and axle. Same 5.25 center hole, as in Engineering Features Book.

Attached Files
received_149589019833674.jpeg (210.25 KB, 76 downloads)

Spanky Hardy
Collector Of Fine Old G.M. COE Trucks & Antique Holmes Wreckers

1948 Chevrolet 5700 COE Holmes HD W35 Wrecker
In the Stovebolt Gallery
More pictures on Photobucket

1950 GMC 250 1-Ton
In the Stovebolt Gallery
Re: What year did the rim center circle change?
Tony292 #1387308 Sun Dec 06 2020 07:41 PM
Joined: Jun 2011
Posts: 3,915
E
Shop Shark
I have 5.25" hubs on my '55.2 truck.

Ed

Attached Files
IMG_1295.JPG (365.53 KB, 67 downloads)
Last edited by EdPruss; Tue Dec 08 2020 02:03 PM.

'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: What year did the rim center circle change?
Tony292 #1387320 Sun Dec 06 2020 10:06 PM
Joined: Dec 2002
Posts: 2,589
S
Shop Shark
Ed, That axle must have came from a 54 model truck ? Does it have 5.25 center wheels on the rear ?


Spanky Hardy
Collector Of Fine Old G.M. COE Trucks & Antique Holmes Wreckers

1948 Chevrolet 5700 COE Holmes HD W35 Wrecker
In the Stovebolt Gallery
More pictures on Photobucket

1950 GMC 250 1-Ton
In the Stovebolt Gallery
Re: What year did the rim center circle change?
Tony292 #1387371 Mon Dec 07 2020 03:34 AM
Joined: Jun 2011
Posts: 3,915
E
Shop Shark
Spanky, yes, front and rear, titled as ‘55, came from ND.

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.
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