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AD Chevy Trucks Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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Joined: Oct 2019
Posts: 238
'Bolter
'Bolter
Joined: Oct 2019
Posts: 238
Question: what year did the rim center circle change from 4.75 to 5.25?
Joined: Jun 2011
Posts: 5,096
Crusing in the Passing Lane
Crusing in the Passing Lane
Joined: Jun 2011
Posts: 5,096
Late ‘50’s with the change to tubeless tires, however as early as ‘55 on tube type tires.
Joined: Jan 2008
Posts: 4,963
'Bolter
'Bolter
Joined: Jan 2008
Posts: 4,963
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
Joined: Dec 2002
Posts: 2,549
'Bolter
'Bolter
Joined: Dec 2002
Posts: 2,549
1954 was the first year for the 5.25 rim center circle. Photo from 1954 Chevrolet Truck Engineering Features Book.
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Joined: Jan 2008
Posts: 4,963
'Bolter
'Bolter
Joined: Jan 2008
Posts: 4,963
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
Joined: Dec 2002
Posts: 2,549
'Bolter
'Bolter
Joined: Dec 2002
Posts: 2,549
Trust me Kenneth, I've owned several 1954 Chevrolet 2 ton Conventionals, and COEs, and they all had the 5.25 center bolt circle.
Joined: Dec 2002
Posts: 2,549
'Bolter
'Bolter
Joined: Dec 2002
Posts: 2,549
1954 COE front wheel, and axle. Same 5.25 center hole, as in Engineering Features Book.
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Joined: Jun 2011
Posts: 5,096
Crusing in the Passing Lane
Crusing in the Passing Lane
Joined: Jun 2011
Posts: 5,096
I have 5.25" hubs on my '55.2 truck.
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Last edited by EdPruss; 12/08/2020 2:03 PM .
Joined: Dec 2002
Posts: 2,549
'Bolter
'Bolter
Joined: Dec 2002
Posts: 2,549
Ed, That axle must have came from a 54 model truck ? Does it have 5.25 center wheels on the rear ?
Joined: Jun 2011
Posts: 5,096
Crusing in the Passing Lane
Crusing in the Passing Lane
Joined: Jun 2011
Posts: 5,096
Spanky, yes, front and rear, titled as ‘55, came from ND.
Joined: Dec 2002
Posts: 2,549
'Bolter
'Bolter
Joined: Dec 2002
Posts: 2,549
Okay, that's more like it. Lol. Your other post had me thinking you had a 50.2 model, instead of a 54, or 55 model. ?
