Tires !! REAR TIRE PRESSURE ? !!

[KoonHunter51]

FarmPro 2430 with 11.2 X 24 Farm Lug Rears
Just wondering what PSI you guys run in your tires
I have suspected that my rear tires are not aired up enough, 18/20 PSI & I do not think they are loaded with any fluid
I did a search on here & google & got plenty info that 15/20 PSI was required or that was normal so I ran with it

Well, did a little bushing today & one rear looked too low so I checked PSI & it was about 12 the other was 16
Got the manual out & did a kPa to Psi conversion
Front> 7.50x16> 210 kPa = 30 Psi
Rear> 11.2x24> 180/240 kPa = 26/34 Psi
I do have some steep places, so, Should I use the higher PSI or a little less ?
David

 

[D0TC0M]

As we do with jeeps we lower tire pressure to increase traction

 

[George2615]

I have R4's and run the same 18-20 lbs. in the rears which is lower than the recommended. It gives the rears a little more flex when rolling and more tread on the ground for traction. I verified this driving through both mud and snow. At the higher pressure there was less tread in contact with the ground mainly at the outer edges of the tread. 12 PSI would be too low and may let the bead pop off the rim.

 

[oosik]

I have R-1's and run 20 in the rear and 30 in the front. The pressure is not dependent upon whether your tires are loaded or not. I have Rimguard in the rears.

This pressure gives my tires full bar width contact with the ground.

 

[The Suburban Farmer]

I have R4's and run them so that there is full contact across the bars when it's sitting on a hard surface like the driveway, but no bulge in the sidewall. That's the way my dad and uncles always taught me growing up, anyway. (My tires are filled with Rimguard.)

That comes out to being a little below the stated pressure, but it's worked well for me so far. I think you are better off being a little too light than a little to full.

 

[ovrszd]

Easy to tell if yours are loaded. Roll the stem down and push in the valve core. Liquid comes out, loaded.

Pretty hard to tell you how much air to run. We don't know your circumstances and the loads you are gonna put on your tires. On a tractor tire I prefer to be slightly overinflated, rather than underinflated.

 

[buickanddeere]

They are a balloon bias tractor tire, not a highway truck tire. What is the panic? A little squat or bulge is fine. On flat hard ground the tread bars should have near 100% contact with the ground.What is the weight on the rear axle? Check the tire manufacture's site, odds are 12psi is fine.

 

[ovrszd]

If they are tubeless there might be a panic running them too low and knocking them off the bead.

Running any tire too low on air pressure is extremely hard on the tire. This will show up in the tire's later life.

 

[buickanddeere]

Given the tractor's weight of 4380lbs, fuel operator and rotary cutter. 16-18psi is plenty. 12-16 without the rotary cutter. A dry tire is much easier and cheaper to repair after a puncture. Liquid CaCl ballast is only point is it's cheap upfront cost. pay me now or pay me later.

 

[DK35vince]

I run around 15 PSI in my loaded rear R-4's