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Old 10-18-2018, 08:25 PM   #1
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Tire load range,F,G or H?

What load range tires are most of you using on an 18,000 lb F53 chassis, 19.5 inch tires? I have H rated on mine and was told that is why the ride is so hard, should have F range on it instead. I am running 80psi in all.
I also have an out of balance shake at 60 mph I cannot eliminate no matter how hard I try. I even have Centramatics on the rear which helped some but not completely. Do I have too much tire, too heavy on my rig?
I have a 2004 Fleetwood Southwind 32V motorhome. New Toyo’s on the back, 6 year old Contenentials on the front.

Thoughts?
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Old 10-18-2018, 08:38 PM   #2
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What does your tire placard say? Have you weighed all 4 corners and adjusted the air preshure?
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Old 10-18-2018, 10:16 PM   #3
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I have an '04 32vs on a Workhorse W20 chassis (20,700 lbs). I think it came with F rated Michelins and I'm now running G rated Dunlops. I run 83 in the front and 85 in the back.
Hard to find F range tires now.
I think this is why my ride is so rough. Stiffer sidewalls. Every expansion joint feels like a 4" lip.
I put Konis on it 2 years ago. Handles better but didn't reduce the stiffness.
I don't know what to tell you.
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Old 10-18-2018, 11:14 PM   #4
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Our coach weighs 21,230 lbs loaded for travel. I run Bridgestone R238 245/70R19.5 load range G tires inflated to 80psi and ride is fairly decent. Installation of Koni FSD shocks will significantly improve ride comfort.

Best of luck and safe travels....
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Old 10-19-2018, 05:16 AM   #5
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2006 18K lbs. chassis with 19.5" G tires with a minimum pressure for axle capacity of 80 PSI. I could go lower since my normal weight is well under axle capacity but the inflation tables stops at 80.

Regarding the 60 mph shake, did the shake start with the new Toyo's on the rear?
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Old 10-19-2018, 10:53 AM   #6
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Originally Posted by Sweetbriar View Post
2006 18K lbs. chassis with 19.5" G tires with a minimum pressure for axle capacity of 80 PSI. I could go lower since my normal weight is well under axle capacity but the inflation tables stops at 80.

Regarding the 60 mph shake, did the shake start with the new Toyo's on the rear?
No, it has ALWAYS had the out of balance shake. Did it before I replaced the fronts a few years ago, still does it after the Toyo's in the rear. Maybe the fronts were not balanced properly or run-out is too much. All I know is for something so simple I cannot seem to resolve.
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Old 10-19-2018, 11:34 AM   #7
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Maybe it's something like a driveshaft out of balance.
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Old 10-19-2018, 11:59 AM   #8
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Maybe it's something like a driveshaft out of balance.
The cadence suggests tires only, drive shaft would be much faster vibration.
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Old 10-20-2018, 08:18 AM   #9
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Yes "H" rated tires for your size coach is little stout. Not necessary with your load capacity.

I run Toyo "H" rated tires on the rears on our rig but our tires are much bigger and carries a much larger load than your does. Our coach runs beautiful with them @ 80PSI.

As far as the shaking is concerned, read my recent post here Post #19:
Intermittent bounce of motor home steering column bounce up and down
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Old 10-22-2018, 06:02 AM   #10
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Yes "H" rated tires for your size coach is little stout. Not necessary with your load capacity.

I run Toyo "H" rated tires on the rears on our rig but our tires are much bigger and carries a much larger load than your does. Our coach runs beautiful with them @ 80PSI.

As far as the shaking is concerned, read my recent post here Post #19:
Intermittent bounce of motor home steering column bounce up and down
Thank you, very informative read.
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Old 10-29-2018, 12:39 AM   #11
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Quote:
Originally Posted by Agility57 View Post
What load range tires are most of you using on an 18,000 lb F53 chassis, 19.5 inch tires? I have H rated on mine and was told that is why the ride is so hard, should have F range on it instead. I am running 80psi in all.
I also have an out of balance shake at 60 mph I cannot eliminate no matter how hard I try. I even have Centramatics on the rear which helped some but not completely. Do I have too much tire, too heavy on my rig?
I have a 2004 Fleetwood Southwind 32V motorhome. New Toyo’s on the back, 6 year old Contenentials on the front.

Thoughts?

I run G rated tires on a 20,500 lb Ford chassis and its up from the factory 12 ply and gives me much more safety carrying weight with a slighter stiff ride but why you have H rated on a 18,000 lbs I don't understand, F would have been enough..
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