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Old 06-23-2019, 02:42 AM   #1
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Default Front Tire Pressure

Sorry but I can't remember the thread where this came up, but it had to do with finding the optimum tire pressures. I have a 1997 PW on a Dodge chassis and had been running 55/80. This last trip I bumped it to 60/80. Results:

I didn't notice much difference but then the last trip I took was in March and it's hard to remember "feel." Ride up to the mountains = good. Ride back = so/so. In fairness once we were in the mountains the winds really kicked up and continued throughout our return.

Two things:

That year PW has a very light feel to the steering. In my experiences with past cars, when tire pressure was low in the front the steering required more effort. When restored to their proper, higher value the steering became more effortless. Question: It seems that with the PW you wouldn't want a less effortless steering. It's already light. Wouldn't a lower pressure actually be better?

Second, I went back in my emails to when I bought the RV 3 years ago. I had emailed PW tech support asking them for the alignment specs and tire pressures for my specific year. They sent those in they indicated that despite the door sticker, front pressure should be 65!!

Perhaps next trip I'll run 65 on the way out and 55 on the way back?
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Old 06-23-2019, 02:53 AM   #2
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Quote:
Originally Posted by GallenH View Post
Sorry but I can't remember the thread where this came up, but it had to do with finding the optimum tire pressures. I have a 1997 PW on a Dodge chassis and had been running 55/80. This last trip I bumped it to 60/80. Results:

I didn't notice much difference but then the last trip I took was in March and it's hard to remember "feel." Ride up to the mountains = good. Ride back = so/so. In fairness once we were in the mountains the winds really kicked up and continued throughout our return.

Two things:

That year PW has a very light feel to the steering. In my experiences with past cars, when tire pressure was low in the front the steering required more effort. When restored to their proper, higher value the steering became more effortless. Question: It seems that with the PW you wouldn't want a less effortless steering. It's already light. Wouldn't a lower pressure actually be better?

Second, I went back in my emails to when I bought the RV 3 years ago. I had emailed PW tech support asking them for the alignment specs and tire pressures for my specific year. They sent those in they indicated that despite the door sticker, front pressure should be 65!!

Perhaps next trip I'll run 65 on the way out and 55 on the way back?

Most people seem to like 65 psi in the front of the Dodges, but of course it is very personal choice.


Lower tire pressure to increase effort is kind of the wrong way to go, IMO as it reduces steering response making you more likely to overcorrect because of larger corrections being required than with the lighter effort.


If you want more effort you can start with an alignment and have them put as much positive caster on the front wheels as they can get while still holding the other specs. Be sure you are toed in or effort will be very light once off center. Best is to have maybe 1/2 degree more positive on the right to help hold road crowns. You may also be able to get a different steering gear or have one rebuilt with a stiffer torsion arm in the gear, assuming one can be found in an old unit or aftermarket.



Others have had good success with a steering gear reinforcement that gets rid of mounting flex and supports the outboard bearing of the steering gear. This is an easy mod, makes sense, and seems to work well.
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Old 06-23-2019, 03:10 AM   #3
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Mine is a Chevy Express chassis, not Dodge. But the door sticker says 50psi front. That seemed minimally adequate for load and several here recommended 60-65 psi. I've run 60psi consistently and very pleased with the handling, ride, and tire wear. As others suggested, experiment until you've found the front tire pressure that works for you. But I know of no one who recommends more than 65 psi.
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Old 07-04-2019, 04:16 PM   #4
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I am able to calculate it for you.
Need best, real weights on axles in the loading you drive with, but GAWR'S can do. GVWR and empty weigt would be nice too.
And howmany axles and single ir dual load axles.

Then from tires , can be read from sidewall.
1 maximum liad or loadindex.
2 loadranche or pressure behind AT ( 80 psi I think, so E- load.
3. Speedcode , not that important because above Q for reference-speed 160kmph= 99mph

Collect that and give it here, and I do the math
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Old 07-04-2019, 10:59 PM   #5
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This article:

https://www.thefitrv.com/rv-tips/the...weigh-your-rv/

combined with this one gives some pretty good information.

https://www.thefitrv.com/rv-tips/how...re-in-your-rv/
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