Tire Pressures (Again)

[golden]

Sorry if it seems like I'm beating a dead horse deader, but... I rechecked my owner's manual and the plaque on my door and they said my tire pressure COLD at max weight should be 90 psi front and 85 psi rears. I'm assuming that as tires warm they increase their pressure. Most of you have recommended 95 and 90 respectively. Is that taken when the tires are cold? To me, it seems silly for me to worry about it as I've been nearly a full-timer (average 8 months a year out) with nary a problem. But I also am careful regarding weights and the speed I travel, so certainly not a novice. Maybe I have too much time on my hands. Guess I need to increase my golfing from six days a week to seven!

[golden]

Sorry if it seems like I'm beating a dead horse deader, but... I rechecked my owner's manual and the plaque on my door and they said my tire pressure COLD at max weight should be 90 psi front and 85 psi rears. I'm assuming that as tires warm they increase their pressure. Most of you have recommended 95 and 90 respectively. Is that taken when the tires are cold? To me, it seems silly for me to worry about it as I've been nearly a full-timer (average 8 months a year out) with nary a problem. But I also am careful regarding weights and the speed I travel, so certainly not a novice. Maybe I have too much time on my hands. Guess I need to increase my golfing from six days a week to seven!

[Trek-Cyclist]

All tire pressures should be COLD in the shade, first thing in the morning or on a cloudy day...
Never use someones tire pressure for your coach!
Always get "your" coach weighed and use the Tire makers chart for your weight and tire size...

Never in the sun, or after a road trip.

[FrontRangeRVer]

95 front, 90 rear in the cold, and I checked when hot, and it was about 3 lbs higher in each tire.....not enough to worry about.

I hear there is some type of difference for altitude, but I don't worry about it much....95 front, 90 rears to start trip....whatever happens, happens.

[DriVer]

<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by golden:
Sorry if it seems like I'm beating a dead horse deader, but... I rechecked my owner's manual and the plaque on my door and they said my tire pressure COLD at max weight should be 90 psi front and 85 psi rears. </div></BLOCKQUOTE>... that may very well be correct however what you don't see is the "margin". Adding an extra 5 psi per tire buys you time between checking your tire's air pressure.

I should run 90F and 85R however I choose to ADD 5 psi per tire so that I have a "comfort zone". Remember if you go below what's placarded you're just that ~ below ~. If you're running +5 psi per tire, this buys you a comfort zone before you go below the recommended inflation pressure.

[Trek-Cyclist]

What? Why in the world would a plus 5 lbs per tire buy you anything but a harder ride and poor handling?
The placard states recommended pressures for the "max" weight front and rear axles.
If I'm no where near the MAX weight adding 5 more pounds per tire would/could be over-inflating the tires for comfort?

[DriVer]

<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by Ed/Full-time:
Why in the world would a plus 5 lbs per tire buy you anything but a harder ride and poor handling? </div></BLOCKQUOTE>If we were talking a race car 5 psi might matter (actually +1 psi plus or minus) regarding handling however I have been told by the Michelin rep that inflating a tire to +5 psi above the minimum inflation pressure for the load is a prudent and proactive measure that will assure that your tires do not fall below recommended minimums.

If you're below minimums you're entering a threshold where you don't want to run your tires. If the tires are +5 psi this offers a "slight" margin of safety that will assure proper inflation for the tires at all times.

This is a proactive measure however if you check your tires daily this shouldn't be an issue to any significant degree.

Closing, I am only reporting what was told to me by the manufacturer's representative and I'm not making this stuff up.

[CoastieSCPO]

I hear what everyone is saying about pressures and when to check them, like in the shade and first thing in the morning. Well, the problem sometimes is that it gets to be so cold overnight that the tire pressures always seems to be low whe they are checked in the morning, or for that matter, at any time when its real cold outside.
Bob

[DriVer]

<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by CoastieSCPO:
Well, the problem sometimes is that it gets to be so cold overnight that the tire pressures always seems to be low when they are checked in the morning, or for that matter, at any time when its real cold outside. </div></BLOCKQUOTE>Bob, Just before leaving for Florida last Friday morning it had been in the 40s the night before. All my pressures were in the upper 80s and low 90s. I adjusted same according to my inflation schedule and I was good to go.

Of interest here is that the tires were all proportionately low, the fronts were the same and the rears were the same + or - a pound or so, indicating no leaks.

I have a 10 unit, Doran Pressure Pro and when I can sort out the "equal" thing in my tires vs the sensors I'll have a pretty good system in place.

[Tom N]

<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by DriVer:
I have been told by the Michelin rep that inflating a tire to +5 psi above the minimum inflation pressure for the load is a prudent and proactive measure that will assure that your tires do not fall below recommended minimums. </div></BLOCKQUOTE>

The pressure shown in Michelin's load tables are not only the minimum pressure for the load they are the maximum pressure for the load. IMHO and Michelin's also as stated in the RV Tire Guide, it is not prudent to inflate your tires to a higher pressure than is shown in the tables for your weight.

I spoke to my Michelin Truck tire dealer a month ago (I spoke to the owner and he is an RVer driving a Bluebird). He told me to use the tables and do not add or subtract anything.

Adding +5#s over what is recommended in the tables is no assurance that your tires will not fall below recommended minimums/maximums. What it will assure is that you've over inflated your RV tires for your load.

-Tom

[Trek-Cyclist]

<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by DriVer:
Closing, I am only reporting what was told to me by the manufacturer's representative and I'm not making this stuff up. </div></BLOCKQUOTE>
I wouldn't take a persons word over hardcopy without really thinking about projected outcomes negative or positive.. People go away or forget especially when there's a problem

[DriVer]

<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by Tom N:
The pressure shown in Michelin's load tables are not only the minimum pressure for the load they are the maximum pressure for the load. </div></BLOCKQUOTE>Tom, The chart indicates the minimum pressure for the maximum load.

[ctcamper]

Keep in mind service gauges can vary in accuracy from +/- 1 to 3 psi

[TandW]

<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by DriVer:
<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by Tom N:
The pressure shown in Michelin's load tables are not only the minimum pressure for the load they are the maximum pressure for the load. </div></BLOCKQUOTE>Tom, The chart indicates the minimum pressure for the maximum load. </div></BLOCKQUOTE>DriVer, I interpret charts as you do.