What were "factory" AC duals?
Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=210131
Printed Date: 20 Feb 2026 at 1:18pm
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Topic: What were "factory" AC duals?
Posted By: ranger43
Subject: What were "factory" AC duals?
Date Posted: 19 Feb 2026 at 8:29pm
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So could tractors like the 7000/8000 series be ordered from the factory with different type of duals? i.e. clamp-on, cast, hub, mexican hat etc. or were those mostly "dealer installed" ? I assumed that Cast style were more factory ?
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Replies:
Posted By: tbran
Date Posted: 20 Feb 2026 at 9:21am
Clamp ons were usually dealer provided aftermarket. Mex hats and cast were always selected from nearly a page long list of options. Of course there were 2 or 3 different lengths and sizes of axles that had to be spec'd as well. At times with or w/o tires.
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When told "it's not the money,it's the principle", remember, it's always the money..
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Posted By: Brian F(IL)
Date Posted: 20 Feb 2026 at 10:50am
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When my Dad and uncle were in business (mid-60's to late '70's), I never remember seeing a new tractor come from West Allis with duals. Duals were always added at the dealership. As I recall, most were clamp-on duals. I don't remember any axle duals but there may have been a few.
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Posted By: DSeries4
Date Posted: 20 Feb 2026 at 11:03am
Duals were dealer installed, not factory installed. Clamp on duals were provided by the aftermarket. Flower pots and Mexican hats are informal names for the cast centers that factory duals had.
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'49 G, '54 WD45, '55 CA, '56 WD45D, '57 WD45, '58 D14, '59 D14, '60 D14, '63 D15D, '66 D15II, '66 D21II, '67 D17IV, '67 D17IVD, '67 190XTD, '73 620, '76 185, '77 175, '84 8030, '85 6080
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Posted By: DrAllis
Date Posted: 20 Feb 2026 at 11:20am
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I think 7580's had a "clamp-on" factory ordered dual wheel. Seems like they had some sort of interlock notch on the dual wheel band to engage with the inner rim so it could never spin. A fancy set of clamp-on's for lower cost and in the case of a 7580, something not so heavy, as the tractor was heavy enough as it was.
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Posted By: ranger43
Date Posted: 20 Feb 2026 at 11:55am
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Thanks guys, I always kind of wondered about that. I am debating what to out on my 8070. It current has clamp-on, but the tires are shot. I put hub duals with pressed wheels on my 210 years ago, and like that set-up, but was considering the more original cast set-up for the 8070.
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Posted By: 8070nc
Date Posted: 20 Feb 2026 at 12:37pm
Ive never a sales brochure for a 7/8000 series with anything other than cast centers and i dont remember anything other than spinouts
Ive got a 8070 that because if the inside wheel setting and intermediate axle length im going to have to use mexican hats but ive got a set
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1984 80780
1957 D14
DES 300 with 25000 engine
616 tractor
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