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Old 12-18-2015, 08:55 AM   #1
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What Tire pressures and with Crossfire tire equalizers?

Hello we are going to order the crossfire equalizes.

Just don't know which size? 100-105 or 110psi????

I went to weigh the RV with normal travel load; gear, water, waste and fuel.

Front 6640
Rear 12540
Total weight 19180 with all 4 people that usually travel inside!


19.5 new Tires rated 110 cold 4300 each as dual 4500 as single



What tire pressure should I be running front and rear?



I appreciate your input in advance.


Thank you!
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Old 12-18-2015, 10:33 AM   #2
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For tire pressures you will need to use the tire manufacutre's recommanded pressures based on the tire size and model if so listed. Most manufactures publish recommanded pressures for the weight on the tire and the tables can be found on line.

Front and rear axle weight numbers are a good start but if you ever get a chance to have the individual tire weight checked get in line for the service. Even though you should have equal pressure in all tires on an axle its good information to have to help you balance you loading as best you can.

Regarding the crossfire equalizes, I never reseached them myself so I can't help you with that question.
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Old 12-18-2015, 11:02 AM   #3
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So I saw website load inflation table.


For rear duals:
It says 110 @ 4300 like the sidewall of tire states for cold psi.

If I get the 12,540 and divide by 4 it only gives me a need of 3135.
The table only goes down to 3415 @ 80 psi.

It sounds like too little PSI.

Can i just run 100-105 like I have now?


For front singles:
It says 110 psi @ 4540.

If I get the 6640 and divide by 2 it only gives me a need of 3320.
The table says 3640 @ 80psi is min.

Can I just run 95 like I have now?


Now Im confused...Have I been running too much for my MH?
I know have have more tire than I need but thats fine with me.
2 extra plys. I think they are g rating....



What should I do?
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Old 12-18-2015, 11:05 AM   #4
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Quote:
Originally Posted by Tonykeys View Post
Hello we are going to order the crossfire equalizes.
Just don't know which size? 100-105 or 110psi????
I went to weigh the RV with normal travel load; gear, water, waste and fuel.
Front 6640
Rear 12540
Total weight 19180 with all 4 people that usually travel inside!
19.5 new Tires rated 110 cold 4300 each as dual 4500 as single
What tire pressure should I be running front and rear?
I appreciate your input in advance.
Thank you!
I can't say what pressures you should run...(that can only be determined by reading the tire pressure charts for the tires on your coach) .
However I suggest you hold off buying Crossfires, (or the similar Cat Eye), equalizers until after the correct tire pressures need for the tires on your particular coach are established.
Mel
'96 Safari, (with 100 psi Link Cat's Eye equalizers: Cat's Eye® - Link)
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Old 12-18-2015, 03:49 PM   #5
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So say Im supposed to run 80psi front and back...

I think its less than I want. Can I put 100 on rears and 90 upfront?

What the issue. My tires cold are rated 110psi?
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Old 12-18-2015, 03:59 PM   #6
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Tire pressure/load charts show the absolute MINIMUM air pressure for the corresponding load If you follow these charts you are running your tires at their maximum load continually. The tire placard inside your RV is there for a reason, that is what the manufacturer requires for the vehicle GVWR. The Rubber Manufacturers Association (pg 53)states to never run less than the tire placard stated air pressure, regardless of what the tire mfgr inflation charts say.
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Old 12-18-2015, 04:01 PM   #7
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You don't want to use the Tire Manufacturer's maximum pressures to set your tire pressures. That may be much higher than what is actually right for your coach to balance carrying capacity and ride comfort.

You want to use your coach maker's recommended cold tire inflation pressures. This should be on a coach maker sticker that shows the recommended tires to use on each axle and the recommended pressures. These are based on your specific coach's max rated axle weights. Don't go lower than this PSI, but it's OK to go a few PSI higher, if the coach maker recommended PSI is lower than the maximum PSI for the tires on your coach. Sometimes the coach maker will recommend the max the tires are rated for, if they have maxed out the tires in their design. This happened to the case for the 4 rear tires on my former RV, a 2008 Itasca Cambria Class C.

The CrossFire's visual display will be right on the black line at their rating. So for example if your coach maker recommends 80 PSI in your rear dual tires, you would buy the 80 PSI CrossFires. Then, when the tires are at air temperature before you drive, you can quickly do a visual check.

Once you drive a ways and the tires become warmer, the Crossfire will start to show high pressure but this is normal. On my coach the cold pressure is about 82 PSI and after driving a few hours the tire pressure will rise to 90 PSI.
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Old 12-18-2015, 04:11 PM   #8
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Good deal. I got it.
My manufacter shows to run 85 psi.
If been running 100 all around.

I think I will order the 90 or 95 then. Thks!
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Old 12-18-2015, 05:57 PM   #9
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You are far better off to be over inflated than under inflated. Don't let the rocket scientists and brain surgeons talk you into going too low.
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Old 12-18-2015, 06:04 PM   #10
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The other side is if over inflated the ride will be rougher, no?
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Old 12-18-2015, 06:10 PM   #11
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I seriously doubt if you can tell the difference of 10 lbs.
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Old 12-18-2015, 09:09 PM   #12
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My coach tire pressure guideline is 90 psi. I use 95 psi crossfires on the dualies.
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Old 12-18-2015, 10:16 PM   #13
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Quote:
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Good deal. I got it.
My manufacter shows to run 85 psi.
If been running 100 all around.

I think I will order the 90 or 95 then. Thks!


I can't makeup my mind

I've been running 100 all around.

My MH reads 85 is what should be running.
I have HD g rated tires. They say 110 cold psi.


Going from 85 to 90 I'm sure is good. But 95? Is that too much! 10 over coach specs.
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Old 12-18-2015, 10:45 PM   #14
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Our coach uses the 245R/70x19.5 tires. Based on the coach weight and load inflation chart for the tires, 80psi safely supports the weight.

You can run with a higher psi, but ride may be a bit rougher....

Good luck & Safe Travels....
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