Rim/tire Size question

[Hjalbert]

Good afternoon. I need to replace my
rear tires. I found a used set for a good price, already on rims. I currently have 16.9-28 on a 15 inch rim. The ones I’m looking at are 18.4-26 on a 16 inch rim. Both are 8 lug. The height should work, and the extra width should not be a problem, but the ad says “dual rims”, and in the photo I notice it only has 4 bolts connecting the center part of the rim to the outer part, while mine have 6. I am attaching pictures of the 18.4 and my 16.9. Thanks for any advice on if the rims will fit, as it doesn’t do me much good to drive two hours and save money if they don’t fit when I get them home. Thank you all.

 

[beenthere]

Do you plan to use them as a dual to your existing tire?

 

[Hjalbert]

Do you plan to use them as a dual to your existing tire?

No, I do not, I just want to replace the rim and tire with these as a unit on each side.

 

[Hjalbert]

I noticed in the pics it looks like
The centers were welded in, where as mine are just bolted.

 

[LouNY]

The bolted in centers give more flexibility on the tire and rim spacing (4 options) were the welded center on gives you 2 spacing options. The one piece welded is usually a less expensive wheel instead of buying a center and a rim.

 

[Hjalbert]

As long as they work for $350 for the pair I’m ok with the lack of flexibility. I don’t use any plows or do any row crops and I rarely drive on the road. Mostly clearing overgrown brush and the wider tires will help distribute the weight better. If they are still available this weekend I’ll update. They look to have a lot more tread than mine, and while
I can see some aging they aren’t as bad as mine. Thanks for the input. I’m guessing the duals mean that the spacing of the centers allows them to be mounted against each other? But it doesn’t look like it could be done without a pretty thick spacer.

 

[LouNY]

Most of the "duals" used these days are "hub" mounted. These duals just bolt up to a hub which is mounted on the axle, these tractors have a "bar" rear axle not a flanged rear axle. This allows for the wheels to be mounted on the axle with the proper spacing between the wheels. The older "clamp on" duals used a spacer ring which fit in the wheels to obtain the proper spacing of the tires.
If too close together and the tires flexed against each other they would be rubbing and ruining the tires, also unless the spacing is wide enough to clear row crops getting rocks wedged between the tires had to be monitored and remove before damaging the tires.

 

[oldnslo]

Is this a two wheel drive or front wheel assist ( 4 wheel drive)? Suspect 2 wheel since no mention of concern on changing size affecting front to rear drive ratio.

 

[Hjalbert]

Is this a two wheel drive or front wheel assist ( 4 wheel drive)? Suspect 2 wheel since no mention of concern on changing size affecting front to rear drive ratio.

It is a four wheel drive but the height is close to the same as what I currently have on the back.

 

[beenthere]

What is important is the circumference ratio of the front tires to the rear tires when in front wheel-assist mode. Something you may want to check into