Community Forums

Gary RVRoamer · 06-04-2011, 08:59 PM

I try to get the tires on the same axle within 2 psi of each other when cold. I figure they can easily vary 2 psi just from the sun shining on one and not the other. My Pressure Pro reads about the same as my two good gauges, one analog and one digital.

offthewall · 06-04-2011, 09:20 PM

Quote:

Originally Posted by wa8yxm

First: it is 100% normal to run different pressures in different tires, IN fact it is very rare that you should run them all the same.. Very rare. ...

... Some folks say if right and left side are different, use the higher pressure.

It's not "some folks", it's the tire manufactures. They state that both tires on the same axle should be the same pressure. Always use the higher pressure on both tires on the same axle as indicated by the weight/pressure chart.

To use different pressures on each tire on the same axle will cause handling issues, especially on the steer axle.

Dutch & Diana Irrgang · 06-05-2011, 01:13 AM

We've always felt that 3-4 pounds + or - is an acceptable range for us. We've been using our TST for a year. As others have said, the tires on the sunny side will read differently than those on the shady side. As long as your tires look ok and you have your alarm parameters set correctly, I don't think you have any worries. Diana

Quote:

Originally Posted by micd

While I absolutely love my TST tire pressure monitor system it insists on telling me when I haven't gotten all the pressures exactly equal in all the tires.

So what do other folks figure is a good enough tire pressure difference between the tires when your dealing with 6 tires? Is 1 lb difference OK but 2 or 3 too much? I figure before digital gauges folks were using the stick ones and those aren't really precise.

Also our driveway isn't level and our street isn't either so it is really hard to know if this is affecting the pressures.

Thanks!
Michelle

micd · 06-05-2011, 05:51 PM

Thanks to everyone for their input. We just got back from a trip. On the way home it was in the 90s and the coach handled like a champ on the expressway going 65-70 mph even though my staring pressures read between 69 and 73. We aim for 70. Based on our weight and the manufacturers chart we should be at 65 but because were higher in altitude (Denver) I add a half lb for every 1000 ft and then rounded up a bit.

I do probably need to raise my high pressure alarm as my TST kept going off with the pressure got to 85. But since it was so hot out and they were all approaching that pressure I figured it was due to the heat.

Dutch & Diana Irrgang · 06-06-2011, 12:16 AM

We sometimes travel all day and can be in hot weather one minute then up into the mountains next. The suggested TST 15% above and 10% below parameters just didn't work for us so we changed ours to 20% above and 15% below. We are still very safe but don't have to worry about the the alarm going off. Diana

Quote:

Originally Posted by micd

Thanks to everyone for their input. We just got back from a trip. On the way home it was in the 90s and the coach handled like a champ on the expressway going 65-70 mph even though my staring pressures read between 69 and 73. We aim for 70. Based on our weight and the manufacturers chart we should be at 65 but because were higher in altitude (Denver) I add a half lb for every 1000 ft and then rounded up a bit.

I do probably need to raise my high pressure alarm as my TST kept going off with the pressure got to 85. But since it was so hot out and they were all approaching that pressure I figured it was due to the heat.

micd · 06-06-2011, 10:19 AM

Thanks! I'm going to reprogram with these percentages.

Michelle

Steve N Sal · 06-06-2011, 10:46 AM

I try to keep them as equal as possible when cold.

Mr_D · 06-06-2011, 11:18 PM

Quote:

Originally Posted by Dutch & Diana Irrgang

We sometimes travel all day and can be in hot weather one minute then up into the mountains next. The suggested TST 15% above and 10% below parameters just didn't work for us so we changed ours to 20% above and 15% below. We are still very safe but don't have to worry about the the alarm going off. Diana

According to Michelin: if your tires are run at 20% or more low then they have been dangerously overloaded and need to be broken down and inspected for broken cords/belts. Both tires on a dual axle can be ruined if one goes down as the load transfers from the low tire to the one with the correct pressure. Again, not my statement, but one from the tire manufacturers.
Also, be sure your wheels and tires can take 15% over pressure when cold. Our original set of front tires had to be run at 120 psi. They would take 131 psi. The wheels were only rated for 120 psi so that was the max cold pressure, hot pressure build up was figured into the ratings but I couldn't go any higher on the cold pressure.

Dutch & Diana Irrgang · 06-06-2011, 11:23 PM

We have our parameters set to alarm at 15% below our cold tire settings not 20% unless I misunderstood your post. Diana

historyljc · 06-06-2011, 11:56 PM

Don't be surprised if the tire pressure monitors don't match the gage pressure. When I bought my Pressure Pro's over 4 years ago it said right on the box that they could be off as much as 3%. If one is 3% low and the one next to it or on the same axle is 3% high you can easily show 5 or 6 lb difference from the git go. Know what they read for the pressure that you set them. Wayne has it right, the pressure should be equal in all tires across the axle and set for the heaviest tire position.

stearn · 06-24-2011, 07:03 AM

Having just purchased the TST system, and reading this forum I find I am not alone in trying to get tire pressures even.
I'm wondering how many remove the sensors while storing, or stationary for a month or more? I read that helps save the batteries.

Ed-Sommers · 06-24-2011, 08:19 AM

I got one of these Psiclops - XL180 - Tire Pressure Balancer - New | eBay and am impressed with the quality for the low, IMHO, price.

NOT affiliated, I'm just old, fat, ugly retired Navy Chief.

Ed

bbeane · 06-24-2011, 08:32 AM

I might be wrong , but I beleave most all tire manf. say check your tires when they are cold "setting over night". Adjust pressure for the weight being carried per tire manf specs, all tires on an axle need to be the same pressure. If you don't know the weight set you tire pressure to the max indicated on the sidewall untill you do, by doing that you will not damage a tire from under inflation. TPMS are great for spotting a low tire before it becomes a problem. But they are not a substitue for a walk around inspection with tire guage in hand before a day out on the highway (it will save you a lot of problems), also don't forget about your towd/trailer tires while your checking. IMHO