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Rim offset


 
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massey1080
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Joined: 02 Sep 2015
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PostPosted: Thu Feb 01, 2018 9:18 am    Post subject: Rim offset Reply to specific post Reply with quote

I bought some IH duals (double bevel), removed the spacers and now I want to weld some 38"
9 bolt centers into the 16" rims for pulling. Tires are 16.9 on there now. These will
be going onto an Oliver 880. What would be the correct off-set? I'm thinking
about in the middle of the rim as I can slide my hubs in or out as needed...
that way if I sell most everyone should be able to use them, no? I was going
to install the centers up against the one of the bevels and see where I ended up,
but was hoping to be about in the center of the rim. Figured before I screw this up
I would like to benefit from you guys with experience at doing something like this! Thanks
 
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535353m
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PostPosted: Thu Feb 01, 2018 9:27 am    Post subject: Re: Rim offset Reply to specific post Reply with quote

you can't go very far wrong with it nearly centered,you are thinking correctly,up against bevel will almost be centered,measure twice,weld once.
 
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Gary Mitchell
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Joined: 05 Jun 2000
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Location: St Clair Co. Missouri

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PostPosted: Fri Feb 02, 2018 11:03 am    Post subject: Re: Rim offset Reply to specific post Reply with quote

Of the dozen or so sets we built we made them where the stud bolt face of the centers would be about flush with the outer edge of the rim. Pop made one set with the hub face centered in the rim, (against my "told you so"), and the only thing it would fit, without moving hubs, was the tractor we started them out on. THAT was later a BIG issue because we also made our own hubs. The ones we made didn't like to move once they lived in a spot for a while. To make a long winded story short, I'd see what other folks were doing and do that. You never know when you might want to change rubber. gm
 
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mmfan55
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PostPosted: Fri Feb 02, 2018 4:20 pm    Post subject: Re: Rim offset Reply to specific post Reply with quote

Friend of mine found a guy that is making aluminum centers for the "Co-Op "wheels. Weigh 17# each. Weld lugs on rim and how the centers are bolted in yields several options on backspacing. Allowing same rims to be used in a variety of applications.
 
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forty40
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Location: Wellsville, NY

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PostPosted: Fri Feb 02, 2018 5:27 pm    Post subject: Re: Rim offset Reply to specific post Reply with quote

If wheels are made up with the idea that they may be put up for sale at some point, they will fit a wider variety of tractors if the backspace is 12" or a little more. Example, a John Deere using the std JD tapered hubs in to the housing, can tow with a low trailer, 82" between fenders and still have an 1" clearance at the crank pulley with a 12" backspace wheel. A 10" backspace with 16" rims will not let the tires clear between fenders, especially if the hubs walk out a little on the axle. Other tractors don't have to clear a crank pulley, but some have very wide axle hubs which pushes the tread width out. Towing with a deckover trailer is not so particular on wheel offset.

When a center is welded into a rim, the dimension from the outer rim down to the center needs to be just a close as a person can read a tape measure. A good aluminum or steel straight edge works best. If the dimension varies much more than 1/32", the wheel will have a visible wobble going down the track.
 
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