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Age/Weather Cracks

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Bud

12-05-2003 07:50:14

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Are there any "rubber" experts out there that can tell us why tractor tires crack over time. Usually when tractors are listed for sale the ad reads " weather cracked " tires but I suspect it has more to do with age and perhaps temperature. I know that tires will crack even when the tractor is stored inside Thanks

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Ron 1456

12-06-2003 15:32:22

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Re: Age/Weather Cracks in reply to Bud, 12-05-2003 07:50:14

I agree with Hugh

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Hugh MacKay

12-05-2003 13:39:44

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Re: Age/Weather Cracks in reply to Bud, 12-05-2003 07:50:14

Bud: I'll put my money on Bob's opinion. Those UV rays are your main culprit. I put new tires on my SA 10 years ago, and religiously kept it in not only a closed building but one with no windows. Not a sign of a crack for 8 years, and then it was outside for about 3 months. My tires are now just a mess of cracks. This is not new, I've seen this for 40 years.

You keep your tractor in a dark, dry building other than when in use, and your tires will go 20 years without a crack.

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Bob M

12-05-2003 13:01:02

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Re: Age/Weather Cracks in reply to Bud, 12-05-2003 07:50:14

Tire cracking is the result of breakdown of the chemical bonds in the elastomers that comprise tire rubber. Exposure to UV light (sunlight) and ozone are the biggest contributors to this chemical breakdown. However heat, exposure to other chemicals etc. will also speed the process.

I suspect the reason tractor tires seem to be more prone to cracking more than other tires is tractor tires are in service much longer than your average car or truck tire. Case in point: With the exception of the rears on my Super M, there's not a tire on any of our 7 tractors is less than 20 years old. Most have been on for 30+ years. (When was the last time you saw a car that's had the same tires on it for 30 years?!) Another case in point: A buddy of mine has a Ford 8N his father purchased new in 1948. The little Ford has lived in a dry, unheated shed it's entire life - for last 40 years or so it's been out only to push snow. The tractor's still on all 4 original tires - they're getting kind worn and shiny, but still show only minor cracking.

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scotty

12-05-2003 10:33:47

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Re: Age/Weather Cracks in reply to Bud, 12-05-2003 07:50:14

Bud, Mille* Tir* has some products that can help save partially weather checked tires.

scotty

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Bud

12-05-2003 10:50:42

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Re: Re: Age/Weather Cracks in reply to scotty, 12-05-2003 10:33:47

I don't currently have a problem. I'm just interested in the mechanism that causes cracking. It seems like tractor tires are more prone to cracking than higher pressure tires but I may be wrong. Perhaps they flex more? It seems to me that saying they are "weather checked" is not correct although I suspect temperature is a contributory factor.

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old

12-05-2003 08:35:25

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Re: Age/Weather Cracks in reply to Bud, 12-05-2003 07:50:14

Over time the rubber drys out so to speak and then starts to crack, there are things on the market that help slow it some but I don't know how well they work.

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