2017 Allegro 32 SA Tire pressure

[Peter M]

Originally Posted by ALinMaine

I did a 500 mile trip at 85 with full water and propane. Glad I did camp had water issues. Front end felt mushy. This trip at 90 - front feels better. Back no real difference.

AlinMaine,
OK I'm at 88 psi front and just under 90 rear, my ride is much better. At 94 psi it was a bit of a harsh ride on road seams.
What chassis mods do you have on your 32 SA in addition to the rear TB ?
As noted in my first post Factory sumo springs, rear TB and saft Tplus steering.

[twinboat]

Originally Posted by Peter M

Mike are you referring to the 32SA ?
My coach at 94 psi there was a harsh ride . I will also say when bleeding air out of the tires 1 psi is a lot of air.

The 1 PSI will return in about 5 minutes of driving, it's not a lot of air.

Tire pressure varies, much more then that, with air temp, road surface temp and road surface construction. Moving the pressures 5 PSI or less, either way, will be almost undetectable.

Did you ever feel the change in your car, before the low air light came on ? Propably not, otherwise you would have never seen it.

The safe thing to do is use the sticker from the manafacture or use a scale and the tire charts for your tire brand and size.

Using someone else's psi recomendation or just dropping the pressure, until it feels good, can cause the tires to fail. That can be costly, in many ways.

[4x4van]

Originally Posted by twinboat

The safe thing to do is use the sticker from the manafacture or use a scale and the tire charts for your tire brand and size.

Using someone else's psi recomendation or just dropping the pressure, until it feels good, can cause the tires to fail. That can be costly, in many ways.

This /\

[DWRichard]

I hope every one of the posters who have dropped their psi from the manufacturers recommendations did so because they set theirs according to their front and rear axle weights.

Otherwise, your desire for an easier ride is putting yourself and others in jeopardy.

[Peter M]

Originally Posted by DWRichard

I hope every one of the posters who have dropped their psi from the manufacturers recommendations did so because they set theirs according to their front and rear axle weights.

Otherwise, your desire for an easier ride is putting yourself and others in jeopardy.

DW , good point . Unfortunately you did not take the time to read my first post, if you did you would not have made your inappropriate post.

I am taking an mechanistic approach to get it correct.

[Peter M]

Originally Posted by 4x4van

This /\

Again read the first post.

[Peter M]

Originally Posted by twinboat

The 1 PSI will return in about 5 minutes of driving, it's not a lot of air.

Tire pressure varies, much more then that, with air temp, road surface temp and road surface construction. Moving the pressures 5 PSI or less, either way, will be almost undetectable.

Did you ever feel the change in your car, before the low air light came on ? Propably not, otherwise you would have never seen it.

The safe thing to do is use the sticker from the manafacture or use a scale and the tire charts for your tire brand and size.

Using someone else's psi recomendation or just dropping the pressure, until it feels good, can cause the tires to fail. That can be costly, in many ways.

Twinboat I totally disagree with the quote one can not detect a 5 psi difference. I sure can, Perhaps you are not as in touch with your coach as I am.
Please read my start post of the thread .. It is not guess work.

[DWRichard]

Originally Posted by Peter M

DW , good point . Unfortunately you did not take the time to read my first post, if you did you would not have made your inappropriate post.



I am taking an mechanistic approach to get it correct.

No one said you didn't, so chill. Others have posted their pressures and the comment was to those who haven't specified whether they've been weighed and how.

If you read the posts on TRVN from their resident tire expert, he'll tell you to add another 5 lbs over the formula for safety purposes.

[Steve Ownby]

Originally Posted by Peter M

Twinboat I totally disagree with the quote one can not detect a 5 psi difference. I sure can, Perhaps you are not as in touch with your coach as I am.

Please read my start post of the thread .. It is not guess work.

I gotta go with Twinboat on this. I'm sure it's somewhat dependent on your specific coach & suspension system. I've seen lots of Twonboats posts and I really doubt that you are more it touch with your coach than he is. I'm guessing that you don't know it any better than I know mine also.

I don't know you or anything about you, except that was an arrogant statement.

[4x4van]

Originally Posted by Peter M

Again read the first post.

I don't need to read the first post again; I was one of the first people to respond to it, and my response was right on the money. If you (or anyone) hasn't actually weighed their rig, then the "safe" move is to use the placard. But the "best" move is to get a 4-corner weigh and set the pressures accordingly. I have never, nor will I ever, suggested setting tire pressure based on ride quality.

[Peter M]

Originally Posted by DWRichard

No one said you didn't, so chill. Others have posted their pressures and the comment was to those who haven't specified whether they've been weighed and how.

If you read the posts on TRVN from their resident tire expert, he'll tell you to add another 5 lbs over the formula for safety purposes.

DW sorry, when you mention every one of the posters my impression was including me.

[Peter M]

Originally Posted by Steve Ownby

I've seen lots of Twonboats posts and I really doubt that you are more it touch with your coach than he is. I'm guessing that you don't know it any better than I know mine also.

I don't know you or anything about you, except that was an arrogant statement.

Steve, it was not an arrogant statement . More like expressing the facts. Regarding being in touch I said perhaps , which implied you may or may not. You assumed differently.
And yes I can detect 5psi pressure changes, try it your self.

If you have something technical to add that would be great.

[Peter M]

Originally Posted by Peter M

I am trying to dial in my 32 SA tire pressure. I am using the following Michelin tire inflation chart for my coach .

Michelin RV Tires | View Michelin RV Tires load and inflation tables for motorhomes and recreational vehicles. | Michelin RV Tires

My coach is Fitted with 255/80 22.5 XRV tires. The dealer had 94 psi in all 6 tires . Was unable to get a 4 corner weight and settled for F & R axle weight.
With a loaded coach the following axle weights are F 8200 , R 13620.Gross F limit 9000 and gross rear 15500.

So we divide the numbers in half for the front corners @ 4100/ side rear @6810/ side.
According to the chart I could be setting the pressure at 80 psi F & R.

I will drop the pressure to 85 and test ride today, reducing the pressure by 9psi.
Side Note : In the last issue of Roughing it smoothly Henderson RV in Oregon did a big write up on the 32 sa regarding chassis modification. Fully loaded they run 80 psi !
So what pressure are you 32 sa owners running ?

Re posted to hopefully get this thread back on point.

Please clarify your source of TP i.e.. Coach posted TP, manufactures recommended TP , TP based on axel or corner weights with tire manufactures recommendations.
Thank You

[DWRichard]

Originally Posted by Peter M

Re posted to hopefully get this thread back on point.

Please clarify your source of TP i.e.. Coach posted TP, manufactures recommended TP , TP based on axel or corner weights with tire manufactures recommendations.
Thank You

Peter, you really, and I mean REALLY should consult with the resident tire expert over at TRVN. He goes by the moniker of Hobodandee and has a lifetime in the tire business. No sense trying to reinvent the wheel. Give him your weights and he'll tell you EXACTLY what pressures you'll need.