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Old 02-23-2014, 08:09 PM   #1
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Proper Tire Pressure Questions

My FR3 30DS has the often mentioned RV Drift issue and I have had the front end aligned. At the latest RV show we went to one of the seminars and spoke with the expert (Dave Solberg - Author of "the RV handbook". We were talking about tire pressure and it's effect on steering softness. We purchased his book and it talks about having each tire at a different pressure, due to different weight on each tire. It sounds like I would have to reweigh the unit every time we use it. Full or empty water/holding/propane tanks, the number of passengers, etc. Definitely sounds like major overkill. I cant even find a place less than a few hours away just to have it weighed. To buy a single wheel scale is ridiculously expensive. The least pricey one I have found was $1700.

What does the average RV user do for setting tire pressures. I always thought looking at the tire and keeping the pressure between the high and the low pressures was the answer. Apparently I am way inexperienced on this topic.
Any help would be appreciated. I did do a search of the site and found no answers.
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Old 02-23-2014, 08:29 PM   #2
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On our 5er and also on the truck, I pump all tires to 65# which is what the ST tire max sidewall pressure. Truck tires are supposed to be at 85#, but only inflate them to 65#.

Individual pressures for different wts on each tire would be a PITA and IMO is beyond ridiculous.
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Old 02-23-2014, 09:33 PM   #3
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The recommended air pressure for the FR3 30DS is 82psi and that's what mine are set at and will stay at
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Old 02-23-2014, 09:53 PM   #4
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I run the specs and watch the wear pattern but if you're really worried about tailoring pressure there's a very simple method we used back in the day.

Load for a typical trip, air your tires to 10 psi over their max, no it won't hurt a thing, go to a parts store and get a tire crayon. Then go find a flat, reasonably level parking lot with a straight run of a hundred yards. Draw a 2" wide stripe across the tread from sidewall to sidewall. Very smoothly drive straight for 50 feet. Get out and check the crayon marks, since you're over inflated odds are the center will wear off first. If just the very center, drop 10psi out, repair the mark and move another 50 feet. Once it gets closer to wearing off near to the sidewalls drop 5psi. Eventually it will wear off at the same rate across the tread of the tire.

At this point it will be evenly loaded across the tread face which is what you're looking for.

Easy cheesy.
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Old 02-23-2014, 10:11 PM   #5
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I'm with Bobb.
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Old 02-23-2014, 10:24 PM   #6
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Quote:
Originally Posted by OldCoot View Post
On our 5er and also on the truck, I pump all tires to 65# which is what the ST tire max sidewall pressure. Truck tires are supposed to be at 85#, but only inflate them to 65#.



Individual pressures for different wts on each tire would be a PITA and IMO is beyond ridiculous.

I'm essentially with OldCoot- I run max pressures on the tires and don't think twice about it.

I've never heard that you should run separate weights on each tire. I think Goodyear recommends weighing the tires individually and then using the maximum pressure for the highest loaded tire. But, for the exact reasons you mentioned - that seems like a lot of work. Given the usage of camper tires, I can't imagine you wearing a tire out prematurely with max pressure.
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Old 02-23-2014, 10:38 PM   #7
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This sounds like the book is recommending overkill. I like the idea of one set pressure for every tire. I like the idea of marking the tire and looking at the road contact. Thanks for the ideas! Any other ideas/opinions would be appreciated!
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Old 02-23-2014, 10:38 PM   #8
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I think some 'experts' pile the cr** on just so they can say they are experts. Beside it sells books. I run max rated pressure on the TT and factory recommended pressures on the TV.
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Old 02-23-2014, 10:46 PM   #9
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The expert also told me info about towing and brakes, that differs with everything I was told before. He had a chart that showed that in NJ trailer brakes are required on all trailers regardless of weight. I was told prior that if the trailer is less than 1000 lbs unladen, or under 3000 lbs laden, trailer brakes are not required. I went to the state Motor vehicle site and it shows that the 3000lb rule is correct, so the expert was mistaken on that issue.
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Old 02-23-2014, 10:56 PM   #10
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I'm guessing you're pretty serious about photography, how many experts books have you read that's so much crap it stinks?

I say as I'm getting ready for Scott Kelbys shoot like a pro seminar tomorrow.
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