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Old 18-12-19, 00:37
Lionelgee's Avatar
Lionelgee Lionelgee is offline
Lionel G. Evans
 
Join Date: May 2009
Location: Bundaberg - Queensland, Australia
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Originally Posted by Tony Smith View Post
Be careful of the ply rating of the 8.25s. Most 7.50-20 were 8 or 10 ply tyres, while the 8.25s are usually 10, 12, or 14 ply. A rough ride will be the result, shaking you to bits.

Are you running duals on the rear axle? Unless your rims have the correct offset for 8.25s, when loaded the tyres will foul each other.

And check clearance around the front end, turning circle can be reduced if the tyres foul the springs or chassis.

I've no experience specifically with Chevs, but early Ford trucks were 6.00-20 and fitting 7.00 or 7.50 tyres led to all sorts of problems with gearing, braking, steering geometry and turning circle. But they were cheaper, carried a heavier load and more readily available than 6.00-20's. Sound familiar?
Hello Tony,

Yes, both trucks run dual rear axles. The Chev had its front mudguards lifted in service. So hopefully this will solve the clearance issues.

Some further searching found that there are some Isuzu trucks that run the 8.25/R20 as standard. As the quality of my rims can only be stated as "dubious" I may be exploring the path of having a set of Isuzu rims getting their centres modified to fit the Chev bolt pattern. Not sure if this is an engineering option that would comply to the Department of Transport and Main Roads here in Queensland?

As far as the rim & tyre count goes I started off in the minus. Both trucks did not come with a full set of rims. Each truck only had singles on the dual rear axle and there were no spares for either truck. Plus I have some ring-ins. There are two almost solid steel faced rims. There are only the stud holes and then two squares cut out of the rim face. One is for access to the valve stem. The other square is directly opposite the valve. Perhaps these were dedicated internal dual rims for the REO Speed Wagon? They sure look like they should not normally be seen.

The interesting thing is that the 1940 Chevrolet rims are interchangeable with the REO stud pattern!

Kind regards
Lionel
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1940 Chevrolet MCP with Holden Built Cab (30 CWT).
1935 REO Speed Wagon.
1963 Series 2A Army Ambulance ARN 112-211
Series III ex-Military Land Rovers x 2
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Old 18-12-19, 01:38
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Lionelgee Lionelgee is offline
Lionel G. Evans
 
Join Date: May 2009
Location: Bundaberg - Queensland, Australia
Posts: 742
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Hello All,

Well that was interesting. The Chev has one front rim with a plate welded to the face where the studs go through. This plate has 10 holes in it. The Chev's front axle has a 5 stud pattern. The other front rim has only 5 holes in it. The Chev's rear axle has a 10 stud pattern.

The REO Speed Wagon has a five stud pattern on both front and rear axles. I have had the trucks for years and never noticed the differences in stud patterns between axles before.

Oh and the oval shaped cut-outs in one of the Chev's rear rims is totally different than all the other rims on the truck - what a bonus.... Not

Photos are: (1) The welded plate with 10 stud pattern front wheel, (2) shape of cut-out on rim edge and circled removable single bead ring (3) 5 stud plate on passenger front. (4) rear rim cut-outs smaller and more numerous. (5) the REO 3 piece bead system. The first four photographs are off the Chev and the last photo is off the REO

Are either of the ring systems the notorious "suicide rims"?

Kind regards
Lionel
Attached Images
File Type: jpg Welded Centre Plate 10 stud.jpg (276.2 KB, 1 views)
File Type: jpg Chev Rim (2).jpg (433.5 KB, 2 views)
File Type: jpg 5 stud front Chev.jpg (643.9 KB, 1 views)
File Type: jpg Rear Chev Rim.jpg (741.4 KB, 1 views)
File Type: jpg 3 part REO Rim System.jpg (455.9 KB, 1 views)
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1940 Chevrolet MCP with Holden Built Cab (30 CWT).
1935 REO Speed Wagon.
1963 Series 2A Army Ambulance ARN 112-211
Series III ex-Military Land Rovers x 2
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  #3  
Old 18-12-19, 04:06
Tony Smith's Avatar
Tony Smith Tony Smith is offline
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Join Date: Feb 2003
Location: Lithgow, NSW, Australia
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Quote:
Originally Posted by Lionelgee View Post
Hello Tony,

The Chev had its front mudguards lifted in service. So hopefully this will solve the clearance issues.

Kind regards
Lionel
The clearance issue is not with the mudguards.

The 8.25 tyre is both wider and taller. As you turn the steering, a taller and wider tyre will contact the chassis and/or front spring sooner that the 7.50 tyre. This can be prevented from happening by adjusting any steering stops (if fitted) on the front hub, but in any case will increase your turning circle.

The other approach is to alter the centreline of the tyre by using a rim with less offset, or fitting a hub spacer with more offset. Tricky stuff to get right, dabble at your own risk.
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