Rear dually wheels

[campbellb0609]

85 1 ton cab and chassis dually wanting to put bigger tires. What options do I have besides swapping rear end for non narrow cab and chassis rear end. First dually so don’t know much about spacing and tire fitment

 

[Grit dog]

I think it’s less about the axle width and more about the space between the tires. Icbw.
Depends how big you want to go. Not much selection for tall and skinny for duals and IMO tall and wide rear tires on a dually look like hot @ss!
Ifn I was doing a lifted doolie, I’d either match tall n skinny’s front to back or srw the front axle so you can run a matching front wheel but in a wider tire and tall n skinny’s out back.
I guess, measure the clearance to the frame to see what you can run for an inner wheel. But I don’t suspect that’s the limit g factor.

 

[PrairieDrifter]

85 1 ton cab and chassis dually wanting to put bigger tires. What options do I have besides swapping rear end for non narrow cab and chassis rear end. First dually so don’t know much about spacing and tire fitment

The main thing is enough space between the two tires, at the ground. When you have a load the tires will squat more and start touching. So tire width and spacing between the duals are the most important things.

I can't say for certain but it seems like there's plenty of room to clear the leaf spring for 10.5 wides, MAYBE, since there isn't much deflection happening halfway up the tire. On stock wheels anyways. But I'm not sure you can fit 10.5's with stock wheels though.

Cab and chassis axles aren't very friendly towards wheels with more dish than stock+ big tires.

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[fast 99]

I tried 235 16's on a dually. Sidewalls would touch when loaded, very close when not. Ended up installing 215's. OEM wheels are the same with either a cab and chassis or dually pickup. Axle width changes nothing. If you look at the picture above there is no room for more offset. Another problem is clearance for the drum, would probably need to go to a larger diameter.

If it matters, DOT will park a vehicle with touching sidewalls.