Question Average tire pressure, Class A

[skychs]

I know and understand tire pressures are based on specific tires and weight. For my coach (2015 Ventana LE with 275/70/22.5) with a GVW around 31,000 lbs the tire charts recommend a pressure around 100psi.

What pressures are you running in your Class A's? Again, I know it's all dependent on coach, size, weight, tire size etc etc. Im just curious what others are running for pressures.
Thanks

 

[Joe Hogan]

On a long trip I’ll hit a Cat scale at my initial fuel stop to verify weight then adjust as necessary.
Granted the tires will not be cold but at startup I can estimate load very close by now, my initial tire pressure is usually spot on, I am never far off.
I Refer to the Michelin tire pressure chart and add 5psi, but never over max pressure, for good measurement at start of the day.
if I need max tire pressure the RV is over loaded as tires are rated for greater weight than the axles are rated to carry.

 

["EZ"]

I usually keep about 100 lbs in mine. Same tire size as yours.

 

[Buly]

110 psi front and 82-85 psi rear and tag

 

[JRW-NAW]

I air the tires to 120 front, 110 rear...

 

[Buly]

I air the tires to 120 front, 110 rear...

I think you are very close to the top limit, which is 130psi. I’m sure on a hot day while driving, the front tires are going past the 130?
Have you checked the Michelin tables against your four corner weight and tires model?

 

[skychs]

I air the tires to 120 front, 110 rear...

That seems a little high to me as well. You may want to refer to the tire pressure chart for your brand of tire. I did verify with Michelin .... its ok to exceed the max pressure while driving. Its the COLD tire pressure that can not exceed the limit.

 

[JRW-NAW]

Per my corner weights I could run 115 & 105 cold but we are happy with the ride and I don't have to be concerned about mile high cold mornings or a little more weight on a trip.

 

[VernV]

105 front and 85 rear cold pressure. 100 and 80 if we are starting a long road trip.
2017 Dutch Star 4369

 

[TJ&LadyDi]

Sorry, but there is no “average tire pressure” for any coach. Each individual coach is different in weight, load balance, tire size, etc. The correct tire pressure for one coach is unlikely to be the correct tire pressure for even another one of the same year/make/model.

Sadly, discussions like this lead people to pick a tire pressure at random based on someone else’s coach instead of getting their own coach properly weighed for corner weights and consulting the tire manufacturer’s charts.

TJ

 

[Neal]

It's true that no one else should tell you what tire pressure you should run. You need to look at the charts and decide from there. There are so many "opinions" and as you know as a pilot we pilots do charts, we do speeds per charts, not adding 5 and 10 knots for the parents, kids, pets. Okay, I hated flying the A-10 at charted final turn speed, I flew it fast, okay there!

My tires by chart are 75 rear and I think 85 front by corner weights. I am now running 105 front and 90 rear. My last trip to FL in Gaffney when I had corner weights done again he talked me into the higher pressures. RVSEF at a rally also preaches higher pressure which about gave me an aneurism as I believe in charts and not opinions. The consensus is lower pressure is harder on sidewalls, I believe that is true, that is my learned opinion. I do notice truck tires seem to be at max pressure, they seem to maintain their shape, makes me wonder. I feel more comfortable at higher pressures for load carrying and sidewalls. I found my ride actually improved at slightly higher pressure (balance). The reason for the lower pressure I believe is about nothing more than comfort, others please correct me if wrong. The tag axle allows for a more comfortable ride by allowing for lower rear axle(s) to run at a lower pressure.

Tough discussion as this wraps safety with opinion. You'll have to use your own judgment in the end.

 

[skychs]

Sorry, but there is no “average tire pressure” for any coach. Each individual coach is different in weight, load balance, tire size, etc. The correct tire pressure for one coach is unlikely to be the correct tire pressure for even another one of the same year/make/model.

Sadly, discussions like this lead people to pick a tire pressure at random based on someone else’s coach instead of getting their own coach properly weighed for corner weights and consulting the tire manufacturer’s charts.

TJ

I was just trying to see what others were running. I understand all the differences in size and weight. I doubt anyone is choosing a pressure based on someone else’s answers. What is interesting is …. learning how some still adjust their pressures different from the charts.

BTW there will always be an average pressure. Simple statistics.

 

["EZ"]

It's true that no one else should tell you what tire pressure you should run. You need to look at the charts and decide from there. There are so many "opinions" and as you know as a pilot we pilots do charts, we do speeds per charts, not adding 5 and 10 knots for the parents, kids, pets. Okay, I hated flying the A-10 at charted final turn speed, I flew it fast, okay there!

My tires by chart are 75 rear and I think 85 front by corner weights. I am now running 105 front and 90 rear. My last trip to FL in Gaffney when I had corner weights done again he talked me into the higher pressures. RVSEF at a rally also preaches higher pressure which about gave me an aneurism as I believe in charts and not opinions. The consensus is lower pressure is harder on sidewalls, I believe that is true, that is my learned opinion. I do notice truck tires seem to be at max pressure, they seem to maintain their shape, makes me wonder. I feel more comfortable at higher pressures for load carrying and sidewalls. I found my ride actually improved at slightly higher pressure (balance). The reason for the lower pressure I believe is about nothing more than comfort, others please correct me if wrong. The tag axle allows for a more comfortable ride by allowing for lower rear axle(s) to run at a lower pressure.

Tough discussion as this wraps safety with opinion. You'll have to use your own judgment in the end.

You are correct Neal. Lower pressures are recommended by RV makers for comfort. A slightly higher pressure will almost always make the tire last longer at the expense of ride quality. The key is to not get carried away and put too much pressure in the tire. ?