Tire sizes and rim sizes

thoner7 · Jul 28, 2019

I'm looking online and the recommendation for a 14.9-24 tire is a 13" wide rim. For 16.9-24 it's 15" wide.

These recommendations seem wide to me. If like to go to a wider tires and was hoping 16.9 would be doable where my old 14.9s were.

Any suggestions?

Bob Bancroft · Jul 28, 2019

Those recommendations are correct. Although a chart will usually say preferred rim, and acceptable rim. I have a fairly new tractor here with 14.9 tires on 12" rims, right from the factory. I don't know if 13" was unavailable, or they're being cheap!

thoner7 · Jul 28, 2019

(quoted from post at 10:03:05 07/28/19) Those recommendations are correct. Although a chart will usually say preferred rim, and acceptable rim. I have a fairly new tractor here with 14.9 tires on 12" rims, right from the factory. I don't know if 13" was unavailable, or they're being cheap!

Well what about 16.9-24 on a 13" wide rim? That's what I'd be looking at.

Bob Bancroft · Jul 28, 2019

Do you know you have 13" rims, or are they 12"?
I've seen it done. I wouldn't do it.

JMS/.MN · Jul 28, 2019

In old size markings, you can go an inch wider or narrower than the rim width. A 14.9 tire is actually 13 inches wide at the bead. It will fit ok on a 12 inch rim.

thoner7 · Jul 28, 2019

(quoted from post at 12:21:42 07/28/19) Do you know you have 13" rims, or are they 12"?
I've seen it done. I wouldn't do it.

Would you mind telling me why?

I'm not certain I have a 13" rim I assumed it was with the 14.9s but I will confirm.

My goal is a wider contact area, so a narrow rim may not actually allow that.

JMS/.MN · Jul 28, 2019

A 16.9 is actually 15 at the bead...2 inches wider than a 13 inch rim. Would not fit well.

DR. EVIL · Jul 28, 2019

The rim companies are trying to do away with odd inch sized rims, only offer even number rim sizes.

The approved rim size for a 16.9 tire is a 15 inch rim, 14 inch is the acceptable alternative.

Leroy · Jul 29, 2019

I would not hesitate to do it. Might just give a bit more rounded tread than you are familuar with but be more like tires were back in the 30-30's. But rims are widened all the time for pulling tractors.

thoner7 · Jul 29, 2019

If 14" will work, I doubt 1" would really make much of a difference over that size of tire. Especially with a tube.

thoner7 · Jul 30, 2019

Let me ask this..... Since my goal is for low compaction, would the extra width of a 16.9 tire be nullified by the extra weight of a fluid filled tire? Seems like a 16.9 would hold a lot more fluid.

old · Jul 30, 2019

Simple answer is no the compaction rate will still be high since it will have more fluid and more fluid means more weight

BarnyardEngineering · Jul 30, 2019

There is no law saying you HAVE to fill the tire right to the brim with fluid. You could take the fluid out of your old tire and put it in the new tire, and be right at the same weight as you were before, save the difference in rubber weight of the rear tires.

The issue with putting a way-wider tire on a rim is that the rim pulls the sidewalls in, causing the tread to have a rounded profile and less contact with the ground than it would have if it were on a proper rim. Long term this will result in an odd wear pattern with the center of the tread wearing out long before the outside corners.

I have 15.5x38's on 12" rims and they don't look any different than 14.9's width wise. I also have a set of 13.6x38's on 11" rims and they are badly squeezed. You'd think I'd learn but I can't take credit for one of the installations. Bought the tractor that way.

Tire sizes and rim sizes

thoner7

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Bob Bancroft

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thoner7

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Bob Bancroft

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JMS/.MN

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thoner7

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JMS/.MN

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DR. EVIL

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Leroy

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thoner7

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old

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BarnyardEngineering

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