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change tire size from 18.4 to 16.9

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chas036

Member
I have 16" rims with 18.4 X 34 tires Can I put 16.9 x 34 tire on those rims without a problem and without affecting my traction? I know that will slow down my speed, but that is no problem because I would like a little slower reverse speed
 
If they are tubeless, there may be a radical issue getting them to inflate due to the bead not touching the rim for an initial seal. They might just work well.. If you are where they are, measure from out side of bead to outside of bead to see if they will get to the sealing rib. If tube type, they will inflate. Jim
 
On a hard pull you will loose some traction. On light work,no problem. However,I don't think you will notice much,if any difference in ground speed.In high gear running down the road,yes. But at idle in low or reverse,nope
 
It's not worth the effort, if you want to see any real change you would need to go down to a smaller diameter rear wheel as well. What tractor is this on that you are wanting to reduce ground speed.
 
Ratchet straps work wonders...

Not uncommon for pullers to mount tire on rims almost as wide as the tire. You gain a bit of hard surface traction, but loose some ride quality.

You will less traction with the 16.9 than 18.4 for most common farming.
 
I bought a JD 4020 once with well worn 16.9s. When new tire time came I installed the 18.4s that belonged on that rim/tractor!
 
Not looking to start an argument here, but back in the 70's I did the opposite change, from 14.9-38's to 16.9-38's on my Oliver Super 88. While the change in speed was biggest in high gear, it was noticeable in all gears. Where before I baled mostly in second gear, afterward I baled mostly in first gear because of the increase in ground speed. Looking at the difference in tire height on my current tractors,1850=18.4/34 and 1655=16.9/34, I'd expect the ground speed difference to be at least as noticeable.
 
With good clean beads, tubes and lube, you should not have any problems getting the beads to seat. I believe that the rim width difference is only 1" from the 16.9 to 18.4 (15" vs 16").
 
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