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Tire dimensions

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Jerry/MT

01-20-2005 19:58:46

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I was putting chains on my old TO-30 the other day and I noticed I got more take up on one side than the other. On checking, I found the the right tire is an 11.2 X 28 and the left tire is a 12.4 X 28. Now I know I'm getting long in the tooth but I can't really see any difference between the two by looking at them (other then the size numbers on the sidewall). Can anybody tell me what the dimensions of each of the se tires or point me to where I can find them?
Thanks in advance.

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Hugh MacKay

01-21-2005 17:45:04

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Re: Tire dimensions in reply to Jerry/MT, 01-20-2005 19:58:46

Jerry: These charts really don't tell you anything but that manufacturers sizes. In my life time I've seen many different profiles on tires the same size. Get the measure tape out, and two loaded tires have the same differential as the same two without load. Now two different size tires may flatten differently under load.

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Bob H nw Oh

01-21-2005 15:31:09

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Re: Tire dimensions in reply to Jerry/MT, 01-20-2005 19:58:46

Jerry,run 1/2 pound more air in small tire!

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Rod F.

01-21-2005 12:44:47

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Re: Tire dimensions in reply to Jerry/MT, 01-20-2005 19:58:46

Hi Jerry,

Normally, I would say that you would want to change that tire right away if you were working the tractor a significant amount, but this is a 50 odd year old Fergie. I'm guessing that it never sees more than 100 hours a year. I'd just leave them alone and not worry about it. The rolling circumference of the 11.2x28 is 143". The circumference of the 12.4x28 is 146". There is 2 inches difference in the overall diameter. That info is from the Firestone tire data book. The difference between a new tire and a worn tire is probably more, and lots of people do that, whether or not they should. HTH.

Rod

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lv-em-all

01-21-2005 06:30:12

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Re: Tire dimensions in reply to Jerry/MT, 01-20-2005 19:58:46

Hay there! I'm not disputing the information Hugh I just was thinking (maybe thats my problem). I never,well hardly ever, run my tractors in a straight line even when roading them from one field to the other. The county roads are straight but my stearing and attention span lets the tractor wonder. It usualy slips more on one side than the other when plowing, and a most of the windrows when haying curve some. I'd like to know if any one has done a study on the ware potentiel from one tire that say, turns 10 more revolutions in a mile than the other. My opinion (oops here I go again) would be that the oil was old, low, or contaminated, to cause a failure in 3000 hours,unless of course it was roaded a lot at high speeds like a car or truck dif.. Well I'll go back in my shell now. Eric NE Ks.

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Hugh MacKay

01-21-2005 17:34:32

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Re: Tire dimensions in reply to lv-em-all, 01-21-2005 06:30:12

Tractor I'm speaking of was relatively new, may never have been in high gear. I will vouch for the owner and say it was never low in oil. You put one to work under constant heavy load as I suggested you will understand.

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Gerald J.

01-20-2005 20:55:31

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Re: Tire dimensions in reply to Jerry/MT, 01-20-2005 19:58:46

Do a google search for the Goodyear Farm Tire Handbook. I don't know the URL because I have a printed copy that is quicker to access.

11.2-28 is 12.4 inches wide, has a static radius of 22.3 inches and turns 439 revolutions per mile.

12.4-28 is 12.4 inches wide, has a radius of 22.8 inches and turns 429 revolutions per mile.

Gerald J.

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Jerry/MT

01-20-2005 22:17:01

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Re: Tire dimensions in reply to Gerald J., 01-20-2005 20:55:31

Thanks Gerald! After I wrote this, that's what I did.

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Hugh MacKay

01-21-2005 06:02:02

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Re: Tire dimensions in reply to Jerry/MT, 01-20-2005 22:17:01

Jerry: I didn't have the exact imformation Gerald provided you with. I would point out however, running your tractor with this difference in tire creates extra wear on the diffential. Normally those diffential gears only turn when you are truning or if you spin one wheel. With the two different size tires the differential gears will turn constantly. In the short term you will never notice any problem. It will take years but will eventually cause problems. I know of one such case, saw the parts, and know the tractor operated about 3,000 hours with odd sized tires.

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Jerry/MT

01-21-2005 12:08:06

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Re: Tire dimensions in reply to Hugh MacKay, 01-21-2005 06:02:02

That's exactly what I'm concerned about, Hugh. The numbers I got out of the Goodyear handbook are different than Gerald provided (47.4 vs 49.5 overall diameters). I swear I can't tell by looking that they are different by that much. I'll go measure them, but I'll have to do something.

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Gerald J.

01-21-2005 16:40:09

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Re: Tire dimensions in reply to Jerry/MT, 01-21-2005 12:08:06

I gave the loaded ROLLING radius, not half the unloaded diameter. The loaded rolling radius is what the tractor axle sees, not some unloaded tire dimension.

Gerald J.

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Hugh MacKay

01-21-2005 13:25:11

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Re: Tire dimensions in reply to Jerry/MT, 01-21-2005 12:08:06

Jerry: I would do measurments, definately. I have 12.4x24 on my Farmall 130. Had a mis match in brand names of tires once, there are definately differences.

I have a tire here called an Astro. Company is now out of business, or at least they don't sell in Canada anymore. I'm not sure you people south of the border ever got Astro tires. Over the years I had several pairs of them. They were quite a decent tire for the price. I had a set of 16.9x38 on my 656 Farmall, 4 of them 18.4x34 on John Deere 540A forestry skidder and a pair of 12.4x24 on Farmall 130. I have one of those 12.4x24 tires still around, and I cant find anything to match it.

Some of these tires just have different profile, one brand from another. Over the years I have seen different profiles within brands. You may find your tires have very similar diameter. Check the out the outside perimeter as well, that will be a bit more accurate.

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