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Rear Tire Pressures


 
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Randy Steep
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PostPosted: Mon Dec 02, 2013 7:32 pm    Post subject: Rear Tire Pressures Reply to specific post Reply with quote

Hi, just put new rear bias tires on my 8n (11.2-28 4ply )and was wondering what pressure to run them at .The tire shop put them at 32 . I am getting a lot of tractor hop while trying to plow snow. I am running chains also .

Thanks
 
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Royse
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PostPosted: Mon Dec 02, 2013 7:44 pm    Post subject: Re: Rear Tire Pressures Reply to specific post Reply with quote

I run about 12 psi in mine.
Chains are rough, I haven't gotten around that yet.
 
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Bob
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PostPosted: Mon Dec 02, 2013 7:47 pm    Post subject: Re: Rear Tire Pressures Reply to specific post Reply with quote

15 PSI, give or take a pound or two is more realistic.

From the Firestone site linked below:

Ask Firestone

 
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old
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PostPosted: Mon Dec 02, 2013 8:34 pm    Post subject: Re: Rear Tire Pressures Reply to specific post Reply with quote

Well 32 is 2 pounds above what should be used to seat the bead on most. I would #1 look for another tire shop to do my tires and then lower the pressure to around 12PSI. Rule of thumb is PSI should equal how wide the tire is so if 12.4 wide 12PSI etc
 
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john B. ne in
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PostPosted: Tue Dec 03, 2013 7:02 am    Post subject: Re: Rear Tire Pressures Reply to specific post Reply with quote

I'm with Old and Royce. 12 pounds is what I run in my 8-n. With a loader and wheel wts, maybe a couple of pounds more.
 
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Dean
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PostPosted: Tue Dec 03, 2013 9:20 am    Post subject: Re: Rear Tire Pressures Reply to specific post Reply with quote

Find a new tire shop.

12 - 16, depending upon load.

Dean
 
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souNdguy
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PostPosted: Tue Dec 03, 2013 12:26 pm    Post subject: Re: Rear Tire Pressures Reply to specific post Reply with quote

30 psi!!!!

I run all my rears at about 12 or so...
 
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gwstang
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PostPosted: Wed Dec 04, 2013 8:01 pm    Post subject: Re: Rear Tire Pressures Reply to specific post Reply with quote

old wrote:
(quoted from post at 21:34:22 12/02/13) Well 32 is 2 pounds above what should be used to seat the bead on most. I would #1 look for another tire shop to do my tires and then lower the pressure to around 12PSI. Rule of thumb is PSI should equal how wide the tire is so if 12.4 wide 12PSI etc


I didn't see this post the first time around. I do have a small question. Does it cause a problem with running the rears at a higher pressure? I run mine about 12-15...seems to depend on which gauge I use that day...lol. Just wondering, thanks.
 
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showcrop
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PostPosted: Thu Dec 05, 2013 4:52 am    Post subject: Re: Rear Tire Pressures Reply to specific post Reply with quote

gwstang wrote:
(quoted from post at 21:01:31 12/04/13)
old wrote:
(quoted from post at 21:34:22 12/02/13) Well 32 is 2 pounds above what should be used to seat the bead on most. I would #1 look for another tire shop to do my tires and then lower the pressure to around 12PSI. Rule of thumb is PSI should equal how wide the tire is so if 12.4 wide 12PSI etc


I didn't see this post the first time around. I do have a small question. Does it cause a problem with running the rears at a higher pressure? I run mine about 12-15...seems to depend on which gauge I use that day...lol. Just wondering, thanks.


A tractor is supposed to pull. Pulling requires traction. Tire manufacturers perform extensive testing in order to determine how to get their tires to pull better. Tire pressure is one of the biggest factors, with little or no load your 8N will do best around 8-10, and loaded it would do better with 10-15. 10-12 is a good medium, for both traction and comfort. generally you want to see just a little "squat" when it is carrying it's normal load.
 
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old
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PostPosted: Thu Dec 05, 2013 7:44 am    Post subject: Re: Rear Tire Pressures Reply to specific post Reply with quote

A lot depends on what your doing. If you say using something heavy on the 3 point you may need more PSI but if your pulling something heavy at the draw bar maybe less PSI. If roading maybe a bit more
 
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gwstang
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PostPosted: Thu Dec 05, 2013 5:09 pm    Post subject: Re: Rear Tire Pressures Reply to specific post Reply with quote

showcrop wrote:
(quoted from post at 05:52:17 12/05/13)
gwstang wrote:
(quoted from post at 21:01:31 12/04/13)
old wrote:
(quoted from post at 21:34:22 12/02/13) Well 32 is 2 pounds above what should be used to seat the bead on most. I would #1 look for another tire shop to do my tires and then lower the pressure to around 12PSI. Rule of thumb is PSI should equal how wide the tire is so if 12.4 wide 12PSI etc


I didn't see this post the first time around. I do have a small question. Does it cause a problem with running the rears at a higher pressure? I run mine about 12-15...seems to depend on which gauge I use that day...lol. Just wondering, thanks.


A tractor is supposed to pull. Pulling requires traction. Tire manufacturers perform extensive testing in order to determine how to get their tires to pull better. Tire pressure is one of the biggest factors, with little or no load your 8N will do best around 8-10, and loaded it would do better with 10-15. 10-12 is a good medium, for both traction and comfort. generally you want to see just a little "squat" when it is carrying it's normal load.


That makes sense about the tire squatting. Thanks.
 
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gwstang
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PostPosted: Thu Dec 05, 2013 5:14 pm    Post subject: Re: Rear Tire Pressures Reply to specific post Reply with quote


Rich, the post above yours sort of reminds me of the old days when we would put traction bars on the rear end of cars to make it squat more and put more traction to the ground. I have also seen cars at the 1/4 miles strip where they use those Hugh slicks and only run a little bit of rear tire pressure. I hadn't thought about tractor tires in that way though. Maybe we need to add some traction bars to the N tractors. Confused
 
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old
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PostPosted: Thu Dec 05, 2013 6:24 pm    Post subject: Re: Rear Tire Pressures Reply to specific post Reply with quote

Those traction bars where installed to keep the rear ends from rolling as torque was put to them. Leif springs tend to roll some so the traction bars stopped that roll so as to not cause lost traction as the spring rolled. Yep BTDT and did my share of drag races on 2 and 4 wheels
 
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