Seneca tire pressure

[Wireless Mike]

A question foe Jayco Seneca owners:
I recently bought a 2016 Seneca HJ with 30,000 miles on it. I noticed the wear on front tires were on outside edges (like pressure was low) so tried digging thru owners manual for proper tire pressure, but no help.
I cleaned the various labels on door and finally found one that listed 100 or 110psi....
The max tire pressure on the Michelin tires is 110psi.
I Bought a long stem gauge & measured all tires but not consistent from 55-80psi

What tire pressure do you run on these truck tires?
Are front different than back?

Does anyone have a TPMS system?
What kind did you get to fit on valves of inside rear duelly wheels?

Thanks for assist to the newbie!

[McGintys924]

Shortly before I picked up our Seneca this came as a post (2017). I believe several owners dialogued with Michelin and determined that it would be safe to decrease tire pressure to 80 PSI. This could provide a better ride. I have maintained mine at 85 since we took delivery. You should have a TPMS as even a 5 pound difference on the duels in the back can cause significant issues. I purchased tire minder and would NOT recommend them. Tire minder sensors break easy and they are expensive. Also they often give erroneous readings.

[EA37TS]

The best thing to do is run the coach across a set of scales and then set the tire pressure per the manufacturers weight to pressure tables.

Based on weight I am running 100 PSI in my Accolade. I believe the Michelin pressure for my weight is very low.

Here is a link to a previous thread on the topic.

https://www.jaycoowners.com/forums/f...ost-78227.html

I have a Tire Minder TM77 TPMS system. It has some issues like giving me a false rapid deal;ation alert when climbing 1500 feet in elevation on mountain roads. Happening with one sensor only so I think it may be bad.

[Robbbyr]

I have weighed my unit several times, my recommended pressure for my axle weights (loaded for travel) was around 85 psi. But I wanted a cushion so I run mine at 95 psi in all 6 tires. When I picked up my unit new they were at 110 psi and the (empty) 3 hour ride home beat us up! That 15 psi difference really helps the ride quality.

As far as uneven tire wear I can't remember any other members complaining much about that. I have over 40K on my tires and the tread still looks new! Unfortunately my sidewalls are experiencing cracking which is not uncommon on our O.E. Michelins. Replacing them before next travel season (maybe with Goodyear). Although not cheap you might consider having the truck aligned. I'm planning an alignment when I get my new tires.

I have the TireMinder system and my only issue was the occasional loss of my toad tire's signal. I talked to Minder and they felt with the proliferation of devices using similar frequencies a second booster would help. They sent it to me free of charge and after installation I had no more dropouts. I love my TireMinder system, but each to their own.

[msherw]

I lose no sleep inflating my tires to factory door sticker. I monitor with TPMS and feel good about it.

[Rustynuts]

Originally Posted by msherw

I lose no sleep inflating my tires to factory door sticker. I monitor with TPMS and feel good about it.

But you can get a LOT better ride and less stress on the coach by going by the Michelin chart and running based on weight. That sticker is on,y stating the maximum pressure.

[SloPoke]

On our Seneca, we are on our second set of tires. Treadwear is not the issue for us as we will replace our tires from old-age and sun-rot before they run out of tread.

We use the Tire-Minder system. Love it and the service they provide after the sale. We used the weight/inflation chart provided by Michelin for a while until a few tire professionals I know personally advised that the pressures they say are at a minimum.

Based on our typical weight, we run 95 on the steers and 100 on the drives.

[Crossingover]

Run 110 all the time, no issues. Don't have stem mounted TPMS because of potential leakage concerns (past experience). Wish we could have TPMS like cars have (mounted inside the wheel).

[JimL]

Greetings,

Never considered lowering the psi from 100-110

Where may one find this “Michelin weight/inflation chart”?

Sounds handy and with a rod trip coming up thanksgiving week, I might just try improving the ride.

Thanks!

[Rustynuts]

Here....

[JimL]

That was fast - thank you!

[1oldmf]

it tells 95% of people NOTHING.

I too, have asked a bout PSI. and got zero USEFUL info.

do not waste your $ on weighing ,

use recommended (on your coach) numbers. and adjust from there.
I would never drop more than 10% of recommended tire pressure,
so if its 110PSI , do not go below 99lbs,
the manufacture spends considerable $$ to research what works best,
and they also spend enormous $$$ on lawyers to advise them on what
"correct" info to provide to the owners .

as far as lowering pressure to get a good ride, THIS IS A TRUCK!

[Rustynuts]

Originally Posted by 1oldmf

it tells 95% of people NOTHING.

I too, have asked a bout PSI. and got zero USEFUL info.

do not waste your $ on weighing ,

use recommended (on your coach) numbers. and adjust from there.
I would never drop more than 10% of recommended tire pressure,
so if its 110PSI , do not go below 99lbs,
the manufacture spends considerable $$ to research what works best,
and they also spend enormous $$$ on lawyers to advise them on what
"correct" info to provide to the owners .

as far as lowering pressure to get a good ride, THIS IS A TRUCK!

The Michelin tire guide tells you everything you need to know about their tires and is written by the manufacturer of the tires we are discussing by the engineers that did all the research, so how is it telling you nothing? All you do is weigh, look up your tire in the charts and it tells you what you need to run....pretty simple. I have never paid to weight and do it regularly, in Oregon the DOT scales are always on and open to the public 24/7.

[JimL]

Uh yeah, I weighed my rig fully
Loaded when new, and have a CAT scale within five miles of where I live in CA, the fee to weigh my rig is insignificant (not free, like I guess OR) but cheap.

Pretty sure Michelin is not going publish anything their legal department hasn’t reviewed and approved.

I appreciate the information and will take it from here - thanks.

[1oldmf]

according to Michelin chart.

on most sizes 16 to 22.5

by dropping the tire press from 110 to 90 psi,
you are loosing large weigh capacity!

16in , 80 to 70 you lose 500lbs PER TIRE (2x500=1000lbs)
(4X 500= 2000LBS)

17.5 , 110 to 90 you lose 600lb PER TIRE
110 to 90 you lose 1200 lbs PER TIRE

19.5 110 to 100 you lose 1000lbs per tire
110 to 90 you lose over 2000lbs PER TIRE!


and so on. this is single configuration .

don't be foolish, and unsafe, tire press specs are by COACH MANUFACTURE, AND THEY KNOW ALOT MORE OF WEIGHT CAPACITY THAN
TIRE MANUFACTURE!,
stop listening to keyboard "experts" and use common sense,

nothing against michelin , my budget doesn't afford them,

[Rustynuts]

Originally Posted by 1oldmf

according to Michelin chart.

on most sizes 16 to 22.5

by dropping the tire press from 110 to 90 psi,
you are loosing large weigh capacity!

16in , 80 to 70 you lose 500lbs PER TIRE (2x500=1000lbs)
(4X 500= 2000LBS)

17.5 , 110 to 90 you lose 600lb PER TIRE
110 to 90 you lose 1200 lbs PER TIRE

19.5 110 to 100 you lose 1000lbs per tire
110 to 90 you lose over 2000lbs PER TIRE!


and so on. this is single configuration .

don't be foolish, and unsafe, tire press specs are by COACH MANUFACTURE, AND THEY KNOW ALOT MORE OF WEIGHT CAPACITY THAN
TIRE MANUFACTURE!,
stop listening to keyboard "experts" and use common sense,

nothing against michelin , my budget doesn't afford them,

No the coach manufacturer does not determine the tire pressure specs, the chassis manufacturer does and since the chassis leaves the manufacturer unfinished they base the MAX tire pressure based on the GVW of the chassis depending on the front and rear axle ratings and tire manufacturer ratings. Jayco only copies what is on the chassis sticker for their sticker, I doubt they know anything about tires, if they did they wouldn’t be putting the cheap Chinabomb’ s on their trailers. Jayco only does it by the numbers, for example my chassis is rated at 29000 GVW, the sticker says the weight after completion is 23569 which they subtract from the GVM to come up with the CCC which is 5431. So once I load it up with my crap and I have scaled it at 24950 for example then 110 psi which is for carrying 29000 is way to much. This is why Michelin who designed and engineered their tires have the RV tire guide. You weigh you chassis and use their chart to determine the optimal tire pressure for your weight you are running at, not the maximum chassis capacity. You can do what you want but there is no way that Jayco knows more bout tires than Michelin does

[1oldmf]

tire manufacture states what load limits are,
chassis maker, based upon springs ,axles, frame,etc, gives a max load cap.
and installs tires that meet those specs.
coach manufacture, using info from tire and chassis makers, builds a coach within limits of given parameters.
now factor in custom wheels, buyer options/requests. and........ OVERLOADING.

the liability falls upon the coach builder, so THEY are the ones that will face law suits, They are the ones who make the recommendations(tire press, load ratings)
if you truely believe the tire maker is the smart one in this line of coach building, wow, your in for rude awakening.

money makes people become over cautious, (or the treat of frivolous law suits)
decreasing air pressure is the absolutely WORST thing to ever tell anyone,
but you go ahead and use michelin's chart, as they will NOT stand behind you. (nor will any tire maker)

I'm done here, as you feel you have the last say, and you feel you know better.

[Rustynuts]

Originally Posted by 1oldmf

tire manufacture states what load limits are,
chassis maker, based upon springs ,axles, frame,etc, gives a max load cap.
and installs tires that meet those specs.
coach manufacture, using info from tire and chassis makers, builds a coach within limits of given parameters.
now factor in custom wheels, buyer options/requests. and........ OVERLOADING.

the liability falls upon the coach builder, so THEY are the ones that will face law suits, They are the ones who make the recommendations(tire press, load ratings)
if you truely believe the tire maker is the smart one in this line of coach building, wow, your in for rude awakening.

money makes people become over cautious, (or the treat of frivolous law suits)
decreasing air pressure is the absolutely WORST thing to ever tell anyone,
but you go ahead and use michelin's chart, as they will NOT stand behind you. (nor will any tire maker)

I'm done here, as you feel you have the last say, and you feel you know better.

Freightliner puts on the rating sticker first and Jayco only copies it and adds their sticker usually almost a year later. The ratings listed on the Jayco sticker with tire pressure ONLY has GWV and front and rear axle ratings, tire and wheel size, nothing to do with the build weight.

[RVermont]

Weighing your rig and adjusting tire pressure for actual load is fairly common in larger rvs. Smaller units are built out fairly close to full load limits and normally have only a 1000 to 1500 lb of extra capacity for personal items and passengers. Diesel class A and super C units are built heavy duty frames and can have 5000 to 10000 lb extra capacity. Family motor coach offers tire weighing and provides guidance for proper tire inflation at many of their international conventions.

One important point with this is that you need to weigh the rig on each axle end to be sure you are accounting for side to side balance. If there is a huge difference you should move some items around to get it closer side to side.

[jadatis]

Originally Posted by 1oldmf

according to Michelin chart.

on most sizes 16 to 22.5

by dropping the tire press from 110 to 90 psi,
you are loosing large weigh capacity!

16in , 80 to 70 you lose 500lbs PER TIRE (2x500=1000lbs)
(4X 500= 2000LBS)

17.5 , 110 to 90 you lose 600lb PER TIRE
110 to 90 you lose 1200 lbs PER TIRE

19.5 110 to 100 you lose 1000lbs per tire
110 to 90 you lose over 2000lbs PER TIRE!


and so on. this is single configuration .

don't be foolish, and unsafe, tire press specs are by COACH MANUFACTURE, AND THEY KNOW ALOT MORE OF WEIGHT CAPACITY THAN
TIRE MANUFACTURE!,
stop listening to keyboard "experts" and use common sense,

nothing against michelin , my budget doesn't afford them,

To your idea, I am a " keyboard expert" .
But no matter what you write, its all about weight on tire and maximum speed used.
I claim to be able to calculate a highest safe pressure , with still acceptable comfort and gripp.
Need for that tire-specifications, and real weights on tires, but in lack off that GAWR's.

Then topicstarter writes about sidewear, but mayby he means only outside of the vehicle. Then its an alignment issue, and no other pressure will help.