710/70R38 vs 710/70R42 vs 800/70R38 - The Combine Forum
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Old 04-04-2011, 12:10 AM   #1 (permalink)
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Default 710/70R38 vs 710/70R42 vs 800/70R38

Hey guys,

Wondering if anyone had any experience with different tire/rim combinations. Basically I understand that the 800s are the best of the bunch, but why are they mounted on 38' rims? The increased air area allows more weight to be carried with lower tire pressure, however Deere equips its 9430s with 710/70R42s as opposed to the 800/70R38 on the 9530 and 9630, and changes again to 710/70R38 on the 9330. Wondering what the reasons are? I would expect the 38" would allow the best ride, most weight borne, and least air pressure however would imagine they cannot pull the heavy weight as well as the larger rim size of 42". As well, is there a big difference between the group 47 and group 48 tires?

Any comments or experience is greatly appreciated on this topic.

I suppose the R42s would be the tractor equivalent of "Twens" or "Dubs" as the kids say these days...

Last edited by pourinthecoal; 04-04-2011 at 12:32 AM.
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Old 04-04-2011, 01:12 AM   #2 (permalink)
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We run 800 38's on our 9430's and LOVE them. Use to run 710 42's on a 9400.

Much prefer the 800's
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Old 04-04-2011, 10:21 AM   #3 (permalink)
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Ten cm difference in diameter between 47 and 48.
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Old 04-04-2011, 10:33 AM   #4 (permalink)
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Quote:
Originally Posted by draww8 View Post
We run 800 38's on our 9430's and LOVE them. Use to run 710 42's on a 9400.

Much prefer the 800's
And I don't.
I've ran two otherwise identical tractors, one with 710/70R42's, one with 800/70R38's.
Both Michelin.
The ride of the 710's is better in the field and far better on the road.
Not to mention a bit narrower overall.

Don
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Old 04-07-2011, 12:49 AM   #5 (permalink)
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We have a 9320 with 710/70/38's and a 9430 with 710/70/42's, both are the exact same Firestone tire. I really like the smoother ride with the 710/42's, but that may be attributed to the fact that the 710//42's are 7 yrs newer, and feel softer compared to the 710/38's. As far as traction goes, I don't believe the extra diameter of the 710/42's is enough to make any noticeable difference in traction when it comes to crunch time.
BTW, the 42's don't really look like dubs. Dubs are usually "blingy." Big yellow wheels are not blingy.
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Old 04-09-2011, 12:21 AM   #6 (permalink)
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Matters who you talk to... Yellow can be pretty blingy to a Deere guy!
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Old 06-22-2014, 03:54 PM   #7 (permalink)
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Very good and*informative*exchange*..*Thank you!
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