tire pressure help - yes, again

[trode]

Still playing with tire pressures and still trying to find best, safe ride.

My Front axle weight is 6550.....axle rating is 7500

Tires are goodyear rv's

Pressure per chart, lowest listed is 80psi for single application is 3640, two tires 7280, way over my weight and very near axle max.

Were at 95 when purchased, I lowered to 85, and when recent alignment and balance was done they put them back at 92, so my calcs are: at 95 load (single application) is 3970 per, total 7940, or at 90 load is 3890 per, total 7780.

Both those are OVER axle weight rating. Even at 80, which is lowest pressure presented in chart, I am running them to carry more 730 lbs more than I have. Looking to stay safe but get the rock hard tire feel gone.

Am I to assume that they should not be run at less than 80 regardless of load? And why does everyone keep putting them back at 90-95, which is way past axle rating?

I may be overthinking this, or am I just missing something? Note: the tires on here are G rated, although at my weights I think I should have F's? Could that be part of the ride issue?

Comments please.

Happy New Year.

[trackman]

I always run 90 for good ride and better mileage

[96 Wideglide]

I'm running H's on mine, and if my memory is correct, my front axle is only rated for 7000#.
I've read on this, and other boards, that higher capacity tires running lower air pressure, will give you a softer ride than the minimum tire, running close to maximum air pressure.

[geno-heidi]

a) Get all four corners weighed...
b) Use Goodyear cart for rating and weight, highest weight on each axle is the one to use...also helps to see if you need to 'balance' your weight better...
c) Go With The Goodyear Charts!
d) Add 4-5 lbs Max for little extra edge, not any more, or ride will get harder and even a little more 'wander'...
Charts put us at 80/82 in rears, 82/84 in fronts, we run 85-87...and all is good!

[LVJ58]

Bridgestone load range "G" minimum per load range chart 80psi and that's what I run.

[chboone]

Continental H rated tires, Single 3,740# @ 85PSI X 2 = 7,840, Dual 3,515# @ 85PSI X 4 = 14,060#. Axle ratings, front 7,000#, drive 11,000#, tag 2,500#. I have weighted my MH twice, once each side of the axle. With the tires at 85PSI, I am well over the fully load weight of my MH, and ride much better then at 95PSI.

Chuck

[Midniteoyl]

Originally Posted by trode

Still playing with tire pressures and still trying to find best, safe ride.

My Front axle weight is 6550.....axle rating is 7500

Tires are goodyear rv's

Pressure per chart, lowest listed is 80psi for single application is 3640, two tires 7280, way over my weight and very near axle max.

Were at 95 when purchased, I lowered to 85, and when recent alignment and balance was done they put them back at 92, so my calcs are: at 95 load (single application) is 3970 per, total 7940, or at 90 load is 3890 per, total 7780.

Both those are OVER axle weight rating. Even at 80, which is lowest pressure presented in chart, I am running them to carry more 730 lbs more than I have. Looking to stay safe but get the rock hard tire feel gone.

Am I to assume that they should not be run at less than 80 regardless of load? And why does everyone keep putting them back at 90-95, which is way past axle rating?

I may be overthinking this, or am I just missing something? Note: the tires on here are G rated, although at my weights I think I should have F's? Could that be part of the ride issue?

Comments please.

Happy New Year.

Never run lower than the minimum, which in this case is 80psi. If you are having harsh ride issues at 90-95psi you can lower them to 80-85psi if you wish.

[trode]

Based upon my original post, for 160 mile trip this past weekend I lowered the fronts to 83 psi, still well within my weight needs, and what a difference from running at 95 psi.... much nicer ride. With weather cold as now, avg temps on trip 35-50 I am not worried about overheating a tire, but when running on black top with air temps in 90's I think I would move back to 90-95 psi range

Did check do the 83 psi at ambient temp of about 60 before leaving.

thanks for the input, I am sold on the 82-85 range for cooler weather, but I still think long trips on highway at 90+ degree temps I would go back to 90-95 for safety. Heat build-up being the concern here.

Happy New Year all

[Midniteoyl]

Originally Posted by trode

Based upon my original post, for 160 mile trip this past weekend I lowered the fronts to 83 psi, still well within my weight needs, and what a difference from running at 95 psi.... much nicer ride. With weather cold as now, avg temps on trip 35-50 I am not worried about overheating a tire, but when running on black top with air temps in 90's I think I would move back to 90-95 psi range

Did check do the 83 psi at ambient temp of about 60 before leaving.

thanks for the input, I am sold on the 82-85 range for cooler weather, but I still think long trips on highway at 90+ degree temps I would go back to 90-95 for safety. Heat build-up being the concern here.

Happy New Year all

Sounds like a plan..

[AndrewC]

My coach weight is front weight 10.500 pound rear 18.500
i have a tMS systemm wich i love very much
front pressure 95psi after 30 minuts of drive it come to 105-108 psi
back pressure 85 pounds after 30 minutes come to100psi
my tires are Michelin XZA2 energy

Andrew

[chboone]

If you are concerned about tire temp, get an infrared temp gun and check your tires each time you stop. You can pick it up at Harbor Freight.

Non-Contact Infrared Laser Thermometer

Chuck

[vscoggin]

Hey, I dont know much/anything about tires --so I have a question--If my tires state 80lbs max and I put them at 80, wouldnt they be over 80 and unsafe after heating up on the road? I put mine at 78--is that OK and safe?---Vince( they are 16"s on F53)

[Midniteoyl]

80lbs max COLD.. do NOT worry that they go over that warm, they are designed too..

As far as what to out in, that would depend on how much you weigh and you manufacturers pressure chart.

[vsheetz]

Don't over think this, IMHO. Get the weights - decide your pressures front and fear accordingly, and be done with it. Mine is good by the numbers and rides/handles well at 85 psi all around. Easy for me to remember too.

I just added a TPMS for convienence and safety - having gotten tired after many years of checking tire pressures and seldom having to do anything...