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Tractor Talk Discussion Forum

regarding FWA and tire size question

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DAN9-Midwest

09-03-2006 07:57:40




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I have a JD 5520 that I replaced the tires on. I used the same size tha was on there but used radials. There is a relatonship between the size of the frontand size of the rear and you have to get it close, I think,or you can mess up the transmission. The tractor came with a front to rear tire ratio of .77 and the factory suggests .74. On newer tractor models I have seen factory mounted different size tires that give a .725 ratio. My radials give a .79 ratio. Anyone knw about this to tell if my .79 is too far away from factory suggested .74? I could swap the front radials back to bias and have a .74 and I'm thinking of doing that.

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DAN9-Midwest

09-03-2006 17:38:59




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 Re: regarding FWA and tire size question in reply to DAN9-Midwest, 09-03-2006 07:57:40  
I neglected to mention I have new radials on the back as well. The concern is that the metric designation puts the rolling cicumference at a different level than normal bias tires. John Deere actually uses radial rear and bias front on new tractors like mine. I presume this is to keep the correct front to rear radius correct. See, I could put the bias back on the front and leave the radials on the rear and have the correct ratio. Or leave radial front and back, have a .79 ratio rather than factory suggested .74 and worry about something else. Any ideas here? Thanks...

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RodInNS

09-03-2006 18:43:25




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 Re: regarding FWA and tire size question in reply to DAN9-Midwest, 09-03-2006 17:38:59  
What size rears did the tractor have, and what did you change to? From what I've seen the metric sizes are generally very close to the standard sizes. I would not worry about a small difference so long as you went to the closest metric size. The whole idea of the system is that the front wheels always turn a bit faster anyway. You don't want them too much faster, but certainly not slower. Again, it's not unheard of to see an inch or more difference in rolling radius on the same size tire from brand to brand.... and not too many of us ever give that so much as a thought when changing tires. I'd worry less. HTH.

Rod

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RodInNS

09-03-2006 09:38:26




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 Re: regarding FWA and tire size question in reply to DAN9-Midwest, 09-03-2006 07:57:40  
I'm not really following you on exactly what ratio you're refering to... but...

If you replaced the fronts with the same size as what they had, and didn't go with some exotic or super low profile radial, then I would not worry about it. No matter what tire you buy, whether it be bias or radial, it's going to have a different profile and rolling radius from the tires you replaced unless it was the same tire. You can look at 3 or 4 different brands or profile radials, and no 2 will have the exact same rolling radius for a given size. Given that the radials will squat with the proper inflation, they should match pretty well with the worn bias tires you have on the rear. So long as the front's turn a bit faster than the rears, everything should be fine. I really would not worry about it. Just enjoy the improved pull and better wear from the radial. Good luck.

Rod

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MSM

09-03-2006 08:21:57




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 Re: regarding FWA and tire size question in reply to DAN9-Midwest, 09-03-2006 07:57:40  
You may want to go back to the bias tires depending on how you use the tractor(alot of 4wd use,especially on hard surfaces,or loader use)The ratio is far enough off to cause some noticible driveline bind in 4wd,but you further aggravated the situation by mixing radials and bias tires which have different traction characteristics.I would go all bias,or all radials,and not mix them.



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ErnieDD

09-03-2006 08:16:02




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 Re: regarding FWA and tire size question in reply to DAN9-Midwest, 09-03-2006 07:57:40  
Is the FWA always on?
Do you highway travel a lot?
The end with the least tractive advantage will wear the tires, and not always to fit.
The factory always knows best.
The tractor pullers cut tires down, how much needs to come off to get close(r)?



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