Tire Pressure

[D beatty]

I have a Farmall 450 with 15.5 X 38 tires and weighing in at 6,700 LBS. no fluid in tires. My question is what is a good starting point on tire pressure for this size tire. The dealer that mounted them set them at 20 LBS. Thank for any feed back.

 

[Dblair]

12 lbs

 

[Massey 101]

Many variables missing, are they full cut tires, top cut, and mph you are running?
Dblair might be close for a non cut tire starting place.
Bryant

 

[D beatty]

Run antique farm stock and the tires are non cut almost new condition. We run low gear and can use the TA once.

 

[778899m]

too many variables to give a specific number,each tire set is on it's own with age,degree of hardness,sun baked,hard cracked,ply rating,amount of nylon in tire,ect.look at the hole you dig at the end,go from there.

 

[M.Genrich]

We ran 16 at the Iowa state fair in the 7000 class with cut 15.5 tires and that seemed about right judging by the holes where we spun out. Rember as you lower your air pressure and as the tires squat going down the track so does your drawbar.

 

[Massey 101]

A stock tire, try 10-16 pounds...evaluate the hole it digs!
When a tire gives you a flat bottom hole, you probably need to add air pressure.....20% depth in the middle is about right for a 15.5...
Good luck...

 

[Anonymous-0]

i start @ 8lbs.and adjust from there,the sides need to wrinkle a little a bit.

 

[PretendFarmer]

I ran 10psi on my old, worn, hard firestones in the 6500#class with my low geared Farmall H.......and won.

 

[Kelly N]

I learned by accident one way to determine if you need more or less air/ I made a few pulls on ONE track and the tractor kept pulling to the left when it was off the ground/ I had thought that both rear tires were at 12 pounds but I just happened to check the pressure and found that the left one had 10 in it. This showed me that it needed more pressure to pull better. It needed 12 pounds to pull equal to the right tire/ Might take you a while but this might help ya

 

[Dblair]

depends on the age of the tire it may not wrinkle mine don't but my newer tires did .

 

[showcrop]

(quoted from post at 13:14:14 08/23/13) I learned by accident one way to determine if you need more or less air/ I made a few pulls on ONE track and the tractor kept pulling to the left when it was off the ground/ I had thought that both rear tires were at 12 pounds but I just happened to check the pressure and found that the left one had 10 in it. This showed me that it needed more pressure to pull better. It needed 12 pounds to pull equal to the right tire/ Might take you a while but this might help ya

Are you doing compaction tests on the track in front of the tires to be sure that it is not because of different levels of compaction.

 

[jdrich]

12-14 lbs