The Gear Box

Welcome to the Gear Box!  Please use the message boards for technical questions.


 

joanfenn

2020 Nov 26 13:40:46
Wow hello Fredric, nice to see you again. Happy thanksgiving to you
 

Stripe

2020 Nov 26 12:51:53
Happy Thanksgiving!
 

ClydesdaleKevin

2020 Nov 26 12:26:33
Happy Thanksgiving everyone!!!
 

Oz

2020 Nov 25 01:26:28
Thank you Joan!
 

joanfenn

2020 Nov 25 00:42:41
Have a good and safe one Mark.  We already had ours last month but will be with you in spirit.  And drooling also. 
 

Oz

2020 Nov 24 16:29:55
Happy Thanksgiving everyone!
 

Elandan2

2020 Nov 22 13:31:55
Ah, that's better. Thanks for all the great improvements Mark. :)ThmbUp
 

Oz

2020 Nov 22 05:15:11
You're welcome!
 

TerryH

2020 Nov 22 03:48:06
Yes - seems to be up and running. Missed it while gone. Thanks Mark!
 

Oz

2020 Nov 17 03:32:58
I know, right?  The changes to the site are coming along, but not without its glitches, of course.  Always a learning curve...
 

joanfenn

2020 Nov 16 18:01:10
This one is good also.  Just nice to chat again
 

Oz

2020 Nov 15 13:09:30
 :D
 

joanfenn

2020 Nov 15 02:49:50
I am used to this one, but not to old enough to learn
 

Oz

2020 Nov 15 02:36:28
Do you like this way better, or the balloon box version?
 

Oz

2020 Nov 14 23:02:46
Thank you!   :)clap
 

Oz

2020 Nov 14 23:01:19
Not as compact with the text, but maybe a bit more "fun" and "chatty"?
 

joanfenn

2020 Nov 14 23:01:18
carry on sir, you are doing a great job :)ThmbUp
 

Oz

2020 Nov 14 23:00:29
LOl!  :D
 

joanfenn

2020 Nov 14 22:58:41
yes it is growing on me now :)
 

Oz

2020 Nov 14 22:58:06
I kinda like it.
 

joanfenn

2020 Nov 14 22:57:57
And I wasn't going to say anything but your are special, not odd
 

joanfenn

2020 Nov 14 22:56:46
It will work just have to get used to the layout
 

Oz

2020 Nov 14 22:55:53
Well, I'm odd.  So... yeah, kinda fits just right.
 

joanfenn

2020 Nov 14 22:55:47
Funny layout I mean.  But nice to be able to chat again
 

Oz

2020 Nov 14 22:55:24
Just transitioned to the new portal system.  I have a lot to recreate yet, but it won't take long. How do you like the new chat room?
 

joanfenn

2020 Nov 14 22:54:24
This is odd
 

Oz

2020 Nov 14 22:53:50
Hi Joan!
 

joanfenn

2020 Nov 14 22:52:54
Hello!!

Author Topic: Tire Pressure 225/70/19.5 ?  (Read 470 times)

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Offline skloon

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  • Make: ITASCA
  • Model: SUNFLYER
  • Chassis: GMC
  • Engine: 454
Tire Pressure 225/70/19.5 ?
« on: August 06, 2020, 12:20 PM »
I have looked all over for a sticker but cant find one I swapped the 8R tires for 225/70/19.5 and wonder what pressure I should run them at
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Offline Eyez Open

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Re: Tire Pressure 225/70/19.5 ?
« Reply #1 on: August 06, 2020, 02:41 PM »
A link to generalized pressures, your tire mfg should have the actual pressure for your tires. And it is up there generally from 80/100 lbs. Rocks on wheels comes to mind.


http://www.rvtirepressure.com/assets/images/extrapages/Michelin_Rv_Load_Inflation.pdf
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Offline ClydesdaleKevin

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Re: Tire Pressure 225/70/19.5 ?
« Reply #2 on: August 07, 2020, 06:49 AM »
I have looked all over for a sticker but cant find one I swapped the 8R tires for 225/70/19.5 and wonder what pressure I should run them at



Somewhere on the tires you will find the recommended air pressure from the tire manufacturer.  Every tire made in modern times has the recommended PSI somewhere on the tire.  For stock 19.5 8r tires, the pressure should be between 80 and 110 psi.

Kev
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Kev and Patti, the furry kids, our 1981 Ford F-100 Custom tow vehicle, and our 1995 Itasca Suncruiser Diesel Pusher.

Offline Rickf1985

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Re: Tire Pressure 225/70/19.5 ?
« Reply #3 on: August 07, 2020, 09:00 AM »
What is molded into the tire is the maximum tire pressure. Do not go above that. The recommended tire pressure depends on the weight on the axle and the tire manufacturers recommendations. Unfortunately Samson does not have a recommended pressure chart for those of us running Samson tires.
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Offline skloon

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Re: Tire Pressure 225/70/19.5 ?
« Reply #4 on: August 07, 2020, 02:39 PM »
I am running Conitinental HSRs
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Offline Ericb760

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Re: Tire Pressure 225/70/19.5 ?
« Reply #5 on: August 08, 2020, 11:51 PM »
Somewhere on the tires you will find the recommended air pressure from the tire manufacturer.  Every tire made in modern times has the recommended PSI somewhere on the tire.  For stock 19.5 8r tires, the pressure should be between 80 and 110 psi.

Kev


That's a 30 psi range. You've been out and about. What psi works best for you?
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1989 Winnie Chieftain 28'

Offline ClydesdaleKevin

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Re: Tire Pressure 225/70/19.5 ?
« Reply #6 on: August 09, 2020, 07:12 AM »

That's a 30 psi range. You've been out and about. What psi works best for you?

30 psi is WAY too low for any motorhome.  I always ran mine around 95-100 psi.

Kev
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Kev and Patti, the furry kids, our 1981 Ford F-100 Custom tow vehicle, and our 1995 Itasca Suncruiser Diesel Pusher.

Offline Elandan2

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Re: Tire Pressure 225/70/19.5 ?
« Reply #7 on: August 09, 2020, 04:09 PM »
Hey Kev, I think he meant the 30 psi range between 80 and 110 psi.
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Rick and Tracy Ellerbeck

Offline Eyez Open

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Re: Tire Pressure 225/70/19.5 ?
« Reply #8 on: August 10, 2020, 07:57 PM »
I am running Conitinental HSRs


110 psi max pressure @ 3970 max load...i just happen to have those tires. A note here however...my tires are 225 75 19.5...they carry about 400lbs more total capacity..
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Offline mytoolman

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Re: Tire Pressure 225/70/19.5 ?
« Reply #9 on: August 11, 2020, 07:35 AM »

110 psi max pressure @ 3970 max load...i just happen to have those tires. A note here however...my tires are 225 75 19.5...they carry about 400lbs more total capacity..
My rig currently has 8r19.5 on 6 inch wide rims running the impossible 5 lug with 8 inch spacing budd wheel. I would love to have more tread surface to the ground and to improve the look a wider tire will add.....Please if you will...what is the difference in PROFILE of the 75 series vs the 70? Do you know if a 6 inch wheel is too skinny?  Can I presume the 75 series profile will be taller and if so how much taller than 70 series. Likewise is it likely thethread to the ground will be narrower for the 75 series in comparison to the 70? You are using Continentals correct? My fast Google search did not show that Conti 75 size....I will also call them... TRANSEAGLE, Another brand listed this  225/75R19.5 size but stated they in this size and configuration was for TRAILERS ONLY NOT FOR TRUCKS maybe THEIR configuration was ONLY for use with TRAILERS and not for use on a Truck and Conti can be...the other descriptions TRANSEAGLE had sounded like they would be wonderful on an RV also...I dont know why they would disallow use on a truck...maybe they dont flex for cornering? but that would only be a concern on the front of a truck....I guess I need to call them please DISREGARD ALL OF THIS CONCERNING TRANSEAGLE FIRST OF ALL THEIR CUSTOMER SERVICE IS AWFUL> SECONDLY IM AN IDIOT I PURSUED THEM ANYWAY(about 3 hours on hold all together in the three attempts/ a frustrating online chat where the question what is the minimum with of rim this tire fits on couldnt be answered) ONLY TO FINALLY FIND OUT THAT MY GOOGLE SEARCH GAVE ME THEM AND THEIR TIRE IS NOT A 19.5 it is a 15 inch which is why it is for a trailer only....who would put a load range G tire on anything 15 inch other than a trailer? lol....Google is your friend?


  https://www.prioritytire.com/transeagle-all-steel-st-radial-st-225-75r15-124-121l-g-14-ply-trailer-tire/?utm_source=google&utm_medium=cpc&adpos=&scid=scplpN1012476-99&sc_intid=N1012476-99&gclid=Cj0KCQjwg8n5BRCdARIsALxKb95VEkh3Ve3RzAkOateyL4NXrLHr1QrnI999gV7sQgdDMUjuLTpF4bAaAhcNEALw_wcB
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Also have "Ethyl" 1955 Ford C600 equipped as a rolling tool store(ETTT)."Brutus" 1972 Ford F250 60k original miles. "Panzer" 1976 MBZ 450SL Roadster.

Offline Elandan2

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Re: Tire Pressure 225/70/19.5 ?
« Reply #10 on: August 11, 2020, 07:57 AM »
Here is a copy of the load/inflation table from Toyo. https://www.toyotires.com/media/1475/rv_inflation_tables.pdf
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Offline Rickf1985

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Re: Tire Pressure 225/70/19.5 ?
« Reply #11 on: August 11, 2020, 09:18 AM »
The profile is is a percentage of height to width. 70 series is 70-% as high as it is wide. So going from as 75 to a 70 means that both height and width change. It will be shorter and wider.
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Offline penskepartyof4

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Re: Tire Pressure 225/70/19.5 ?
« Reply #12 on: August 11, 2020, 02:08 PM »
 !-! Could I ask here? Has anyone switched from 8r19.5 to 225/70/19.5 and seen anything good about doing it?


Is there a benefit with AH11 vs AH35? Other than paying more?

I am considering something by Cooper. We have good luck with them on heavy cars.


I need to order tires. I have super old ah35 hankook 8r19.5 on now. They seem to be good brand and durable. I dont know the difference since this is my first RV.


We are planning a boondocking trip in a few weeks and need new tires. I need to order now to make sure I am a week early on the install with no issues.
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OZ did never give nothing to the tin man, that he didnt already have. -America

Offline Eyez Open

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Re: Tire Pressure 225/70/19.5 ?
« Reply #13 on: August 11, 2020, 02:41 PM »
Ive made a error in my comments to tire size, i stated 275 tire when in fact it is actually a 270. The weights and inflation numbers are accurate. I to have been all over market looking for a wide track tire in a attempt to smooth out a p30 suspension. Some things just have to be addressed with fundamental thinking, in my case rim size is the limiting factor. One just cannot get around a 6 or 7" rim by using a only tires. The only solution i have found for tires is 22" rims and supported by larger 22" tires. Larger width rims larger width tires manufactures are well aware of this. I dont believe there is a wide track 19.5 tire made.

On a car it is one thing to place a wide track tire on a smaller rim, on a heavy...top heavy RV it would be a disatour is my opinion. Side wall flex due to small rims and wide tires creates a lot of heat and blowouts.
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Offline Eyez Open

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  • Model: Imperial 33
  • Chassis: P30
  • Engine: 454
Re: Tire Pressure 225/70/19.5 ?
« Reply #14 on: August 11, 2020, 07:39 PM »
!-! Could I ask here? Has anyone switched from 8r19.5 to 225/70/19.5 and seen anything good about doing it?


Is there a benefit with AH11 vs AH35? Other than paying more?

I am considering something by Cooper. We have good luck with them on heavy cars.


I need to order tires. I have super old ah35 hankook 8r19.5 on now. They seem to be good brand and durable. I dont know the difference since this is my first RV.


We are planning a boondocking trip in a few weeks and need new tires. I need to order now to make sure I am a week early on the install with no issues.


Some issues that can come up would be the inner tire clearance on the duallys..It can happen where the inside of the tires meet each other and rub, a very bad thing. Again this goes to the width of the rims...On my HR rambler there is a inch of room when the rig is just sitting, going down the road and the tires flexing enough to rub each other is not something i have yet to experience...I do monitor this closely however.
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Offline Sasquatch

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Re: Tire Pressure 225/70/19.5 ?
« Reply #15 on: October 22, 2020, 10:19 PM »
I converted my M500 chassis on 19.5 rims from 8R19.5 to the 225/70r19.5 years ago.  I am on my second set of tires in that size now.  The upside: More stable, less wiggle on the road.  Less roll in the corners.  More precise handling.  The downside: Slightly less tall meaning your speedo will be off a bit and the engine will rev a bit higher at any given speed.  But you will have better acceleration.  I would never go back to 8R's.
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