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Tractor Talk Discussion Forum

Radial vrs. Bias Ply

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Mark - IN.

09-17-2004 06:08:10




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Have thought about this before, was thinking about it the other day, and just saw post by TXBLU that reminded me.

Radial tires on a tractor, when to, when not to? Advantages, disadvantages?

I've got turf tires on my Deere, came that way. If had a sod farm, I suppose would be ok, but I don't have a sod farm. Can't do a lot with them, they like to spin under load.

So, looked at Goodyears and Firestones web-sites on AG tires awhile back, and yeah I can tell the difference between the lugs or tread patterns on Radial and Bias Ply, but that doesn't tell me when one is just what the doctor ordered, and when isn't. I've seen monster articulated tractors with both, so obviously both must be ok for Ag conditions (non-road).

Bias Plys have been around forever, and will certainly get the job done for plowing, pulling stumps, etc, but perhaps Radial technologies blow them away. Perhaps Radials cost more up front, but pay for themselves?

Those turf tires are going to go, that's for sure. What to replace them with? What say you?

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Jack Benimble

09-17-2004 13:21:21




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 Re: Radial vrs. Bias Ply in reply to Mark - IN., 09-17-2004 06:08:10  
One point: Don't ever mix the two on tractors or vehicles. On a tractor you will ruin the pulling performance (tractor will pull crooked or on soft ground the bias will want to spin). On a vehicle mixing the two will cause a hazardous situation as the vehicle will handle extremely erratic and slide all over the road.



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Rod F.

09-17-2004 07:13:55




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 Re: Radial vrs. Bias Ply in reply to Mark - IN., 09-17-2004 06:08:10  
Mark,

In my experience, radials wear better, pull better, and ride better. Tire companies also claim that you should also see improved fuel efficiency, but I haven't seen that, but then I added more weight and rack travel when the tires went on, so I didn't expect to see an increase in fuel efficiency. I do know this: Goodyear Dyna Torq II bias tires as well as Firestone Field and Road would last me 2000 hours for the work I do, with a lot of road miles. I now have Firestone 23 degree radials, which now have 2000 hours service and are still 50 %. They were cheaper than Micheline and Good Year radials in my area. I thought the others were just too much money to pay for themselves, but the Firestones have, as they were only about 150 more each than the bias tires. Goodyear radials were near double the price of a bias tire. Just remember the cost of buying new radial tubes, as the bias tubes don't work in radial tires. They are not much more money, just the fact that you need them even if the old tubes are still good. Radial tires flex more in the sidewall, rather than in the tread, and that is harder on tubes. For me to buy a radial is a matter of operating cost, unless I need the all out performance of the radial. You can do some math and see if it works for you. HTH.

Rod

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txblu

09-17-2004 10:35:47




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 Re: Radial vrs. Bias Ply in reply to Rod F., 09-17-2004 07:13:55  
thank you sir.



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TheRealRon

09-17-2004 06:31:02




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 Re: Radial vrs. Bias Ply in reply to Mark - IN., 09-17-2004 06:08:10  
I will replace my bias-plys with radials when the time comes. Because the tread flexes less with a radial they should offer a little better traction and greater tread life, much like on-road truck radials do. In that sense, they should be cost-effective.

The first thing I will do is load them with CaCl. It's a loader tractor used 6 months for moving snow.



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Can't even use my name

09-17-2004 14:33:03




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 Re: Radial vrs. Bias Ply in reply to TheRealRon, 09-17-2004 06:31:02  
If you are using radials you don't use CaCl! Put on axle weights instead. Somehow the fluid messes with the bulge of radial tires and makes them less effective. Just ask your tire supplier.



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txblu

09-17-2004 09:12:12




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 Re: Radial vrs. Bias Ply in reply to TheRealRon, 09-17-2004 06:31:02  
Maybe the tread is stiffer, but the sidewall and tractor stability surely aren't. Additionally, I noticed the bulge hit (and rubbed along) the side of my trailer when loading to bring it home whereas my bias didn't do that.

Was also thinking about stobs, rocks,and other debris that could injure the sidewall squished out that the bias would take in the tread area.

Have read on here that at least one farmer loves and swears by them.

The tractor came with them, they are new, so I'll wait and see how they work out.

Mark

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TheRealRon

09-17-2004 09:57:10




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 Re: Radial vrs. Bias Ply in reply to txblu, 09-17-2004 09:12:12  
Correct. The sidewall is made to be very flexible, this keeps the tread flat. When radials were first put on trucks many years ago people would often point to them and tell the owner "your tire is going flat".

Your point about sidewall damage is a real concern. Pretty sure the manufacturers have addressed this with more rubber in the sidewall but if anyone has any first-hand experience, please share.

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txblu

09-17-2004 10:18:35




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 Re: Radial vrs. Bias Ply in reply to TheRealRon, 09-17-2004 09:57:10  
Well if it helps, my 80hp green 4010 has 6 ply bias size 16.9x38. The rubber to steel ratio is about even as was the 4020 (96hp) 6 ply 18.4x38's.

This new addition has 8 ply radial 13.6 x 38. Rubber to steel ratio is liken to the n series Ford tractors with the 4" front tires. It's all wheel (european mfgr). Even at 8 ply the sidewalls bulge significantly with 18 lbs of air. I run 13 in my Deere.

Mark

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Indydirtfarmer

09-17-2004 06:18:39




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 Re: Radial vrs. Bias Ply in reply to Mark - IN., 09-17-2004 06:08:10  
This conversation might re-open a can of worms, but here goes. Radials provide considerable more traction than bias-ply tires at the same weight (of tractor) That allows you to do several things. One of which is to run your tractor at a lighter weight. (Less ballast- i.e. no fluid in rear tires, or no wheel weights) That saves on compaction, lessens the weight if you haul a tractor on a trailer, and is less stress and strain on axles, bearings, ect.
Radials work better at low tire pressure. A side effect of that is better ride. Cost aside, radial tires are a win-win situation. I'm switching ALL of my tractors to radials as they need new rubber. John

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