My Michelins say 100 psi. the metal info sticker by my door panel says 85 psi front & rear.
I have 35' Allegro Bay, my bins are mostly empty, I dont carry lots of stuff.
So I dont know what tire pressure to use. I bought TST Tire Pressure Monitoring System & need to set hi & low pressure & put propper air in tires. I;m confused.. what do you expect from an old gramma? but I;m learning & thank god for you folks to help me out.
35' 1997 Allegro Bay - No Toad Yet
"We'll be friends until I'm old and senile, then we'll be new friends."
To get the correct pressure, you need to load up and get ready for a trip, ensure you are full gas and for the appliance also , maybe 1/4 to 1/2 tank of water. Go to the weight station and get it weight. Best all four corners, but at lease the front , rear, and the total motorhome. Print out a chart from Michelin and look at the singles for the front with weight and dual for the rear. Post back if you need help.
For best tire performance fill to 90% max PSI as stated on tire. This will provide best MPG and minimize sidewall flex. For smoothest ride, follow the instructions on the door panel sticker as long as those tires are equivalent load carrying capacity to the tires that originally came with motorhome. Frankly, a five pound variance in PSI either way is splitting hairs. I personally would go with 90% max pressure.
There will be others that tell you to weigh the motorhome and then fill then tires to the corresponding weight/psi tables for your tire. All of these answers are correct but I lean towards the 90% inflation to reduce sidewall flex which is a critical factor in a tire's long term health and longevity.
rvgrammady wrote: My Michelins say 100 psi. the metal info sticker by my door panel says 85 psi front & rear.
I have 35' Allegro Bay, my bins are mostly empty, I dont carry lots of stuff.
So I dont know what tire pressure to use. I bought TST Tire Pressure Monitoring System & need to set hi & low pressure & put propper air in tires. I;m confused.. what do you expect from an old gramma? but I;m learning & thank god for you folks to help me out.
If your tires are OEM size, the sticker on your door panel states the pressure you need in them to carry your unit at GVWR. If it says 85psi, you DO NOT need 100psi. That will only add to the ride harshness and potentially wear the tread center faster than the tire shoulders.
100psi is the pressure your tires require to carry their max rated load. It would appear your Manufacturer left a little headroom in the tire specs.
So your MAX required is 85psi. If you are consistently loading below GVWR you could run lower than 85psi, but you need to weigh your rig and consult the tire tables to do that.
I suggest you set your TST to alarm at 75psi and 110. The lower limit is more important, which is why I suggest a 10psi threshold. Your tire pressures will increase as they get hot, sometimes as much as 20psi. You do not need an alarm for that, hence the 25psi higher suggestion
Keith J.
1999 Sunnybrook 27RKFS Fiver.
2005 GMC Sierra 2500HD CC/SB/DA 2WD, LBZ air cleaner, 52 gal Titan tank, Bilsteins, Line-X, Westin steps, Prodigy, Retrax cover, 16K Superglide, 5th-Airborne pin-box, Multi-vex mirrors, TST TPMS.
rvgrammady wrote: My Michelins say 100 psi. the metal info sticker by my door panel says 85 psi front & rear.
I have 35' Allegro Bay, my bins are mostly empty, I dont carry lots of stuff.
So I dont know what tire pressure to use. I bought TST Tire Pressure Monitoring System & need to set hi & low pressure & put propper air in tires. I;m confused.. what do you expect from an old gramma? but I;m learning & thank god for you folks to help me out.
If your tires are OEM size, the sticker on your door panel states the pressure you need in them to carry your unit at GVWR. If it says 85psi, you DO NOT need 100psi. That will only add to the ride harshness and potentially wear the tread center faster than the tire shoulders.
100psi is the pressure your tires require to carry their max rated load. It would appear your Manufacturer left a little headroom in the tire specs.
So your MAX required is 85psi. If you are consistently loading below GVWR you could run lower than 85psi, but you need to weigh your rig and consult the tire tables to do that.
I suggest you set your TST to alarm at 75psi and 110. The lower limit is more important, which is why I suggest a 10psi threshold. Your tire pressures will increase as they get hot, sometimes as much as 20psi. You do not need an alarm for that, hence the 25psi higher suggestion
Take a look at the Michelin Tire Load Inflation Charts: http://www.michelinrvtires.com/assets/pdf/RVTiresBrochure.pdf. But you will need you corner weights to find out what Michelin says, to adjust the air properly. They are on pgs 18 through 20, but there is lots of good tire info in the first 17 other pages. Don't just skip over it!
rvgrammady wrote: My Michelins say 100 psi. the metal info sticker by my door panel says 85 psi front & rear.
I have 35' Allegro Bay, my bins are mostly empty, I dont carry lots of stuff.
So I dont know what tire pressure to use. I bought TST Tire Pressure Monitoring System & need to set hi & low pressure & put propper air in tires. I;m confused.. what do you expect from an old gramma? but I;m learning & thank god for you folks to help me out.
If your tires are OEM size, the sticker on your door panel states the pressure you need in them to carry your unit at GVWR. If it says 85psi, you DO NOT need 100psi. That will only add to the ride harshness and potentially wear the tread center faster than the tire shoulders.
100psi is the pressure your tires require to carry their max rated load. It would appear your Manufacturer left a little headroom in the tire specs.
So your MAX required is 85psi. If you are consistently loading below GVWR you could run lower than 85psi, but you need to weigh your rig and consult the tire tables to do that.
I suggest you set your TST to alarm at 75psi and 110. The lower limit is more important, which is why I suggest a 10psi threshold. Your tire pressures will increase as they get hot, sometimes as much as 20psi. You do not need an alarm for that, hence the 25psi higher suggestion
Diddo!!
Double Ditto
This is what I also do. 75 low and 110 high. Rolling pressure is 80 for the GVWR of the coach for the tires I have (OEM recommended size and load rating for the chassis). Maximum pressure gain I've seen going down the road was around 10 PSI. I did get a high temp alarm once while camped. Sun shining directly on the sensor.
2006 Hurricane 31D aka 'Moby' the Whale
FCC(SW) US Navy Retired 1980-2003
Stella my Navigator
Bogart the All American RV Dog
and
Cocoui waiting for me at the Rainbow Bridge
The wonderful thing about this Forum is whatever answer you want someone will give it to you.
The 90% of max makes no sense UNLESS that happens to be the pressure associated with the load on THAT tire which can only be determined if you weigh EACH ONE!
Since most RVers can't/won't do that you can do what I do and that is to load it up to the cold pressure rating on the tire. If it loses a few psi on a trip don't worry about it.
I think the TPMS low pressures are 25% of maximum.
Dick_B
2003 SunnyBrook 27FKS
2011 3/4 T Chevrolet Suburban
Equal-i-zer Hitch
One wife, two bikes (both Electric Schwinn's with motor assist)
rvgrammady wrote: My Michelins say 100 psi. the metal info sticker by my door panel says 85 psi front & rear.
I have 35' Allegro Bay, my bins are mostly empty, I dont carry lots of stuff.
So I dont know what tire pressure to use. I bought TST Tire Pressure Monitoring System & need to set hi & low pressure & put propper air in tires. I;m confused.. what do you expect from an old gramma? but I;m learning & thank god for you folks to help me out.
Are you sure you need to "set hi % low pressure...? The TPMS systems I have seen only require the "Baseline" psi setting to be entered.
"Baseline" psi meaning what the cold psi recommended pressure is. The tpms then sets upper and lower percentages (both psi and temperature)and if either the upper or lower settings are exceeded you get an alarm.
I don't have the TST system, but I am sure they have a customer service contact phone number. Perhaps you should call.
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