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Old 06-09-2013, 03:28 PM   #1
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Tire Pressure

Still new to this .How much should the tire pressure be on a class c. What is written on the tire is m+s8.00R16.5LT . I'm guessing 16.5 in tires? Is there a difference in back or front or inside tires? Thanks
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Old 06-09-2013, 03:33 PM   #2
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Still new to this .How much should the tire pressure be on a class c. What is written on the tire is m+s8.00R16.5LT . I'm guessing 16.5 in tires? Is there a difference in back or front or inside tires? Thanks
Have your rig weighed (fully loaded) as soon as possible.
Use the tire chart that came with your rig. That's what you go by.
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Old 06-09-2013, 03:53 PM   #3
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Have your rig weighed (fully loaded) as soon as possible.
Use the tire chart that came with your rig. That's what you go by.
Follow that advice. Tire pressure is most important for both safety and handling.
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Old 06-09-2013, 04:19 PM   #4
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My car mechanic has a c-class rv, like mine. Not sure how true this is but he says 55-60lbs is suggested for this instance. So could I not go by the weight chart listed on my vehicle sticker. But to have it weighed like you say, where could I go to? thanks guys.
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Old 06-09-2013, 10:43 PM   #5
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As stated go get it weighed. Then check a tire chart or your owners manual and find the tire pressure for your weight. As an example: my weight is 11,500 loaded. My max pressure is 80lbs. My chart states that the fronts at 60lbs and the duals at 65lbs. That's where they are and we are heading out next week for 5 weeks. I will adjust them as the rides dictates and handling. JMHO
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Old 06-10-2013, 02:54 AM   #6
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When you did the weighing, first add 10% to the loads before searching back in pressure/loadcapacity lists. This is for pressure loss in time, unequall loading R/L, misreadings of pressure- and load-scales, incidental extra loading or loadshifting.

As long as you did not weigh, you will have to do with the Gross Axle Weight Ratings ( GAWR) mostly written on the same plate as the pressure advices , somewhere on the car. Then front only 5% adding ( because seldomly used to the GAWR) but back more reserve , depending on the GVWR, low 15% high 5%, because back is often even a bit overloaded, in combination with unequall loading R/L.

The tire specifications you can find on the sidewall of it, together with the DOT-code wich on one side also gives in 4 figures the production week .
Read from tires maximum load in kg or lbs, and the ,as it is called , reference-pressure( not the maximum pressure) mostly written like this on it, "maximum load xxxx lbs AT yyy PSI (cold).

When you have all this information you can look the loads with reserve , back in lists, but better in my made list, wich are saver, because lower loadcapacity for the pressure, wich gives the same deflection of tire at lower pressure/load combinations, and allowes to go verry low in the pressure.
https://skydrive.live.com/?cid=a526e...E092E6DC%21904
open the USA map for America, and pick the PDF by the pressure .
Then in this list at front the loadindexes and belonging maximum load,
Search the one you have, and search the determined loads back to get the needed pressure above or beneath that.
I added as atachment to this post, 3 PDF's of 95,80 and 65 psi reference-pressure per tire. In the map there is more and also for per axle single and dual , so you dont have to devide yourselfes by 2 or 4 .

These lists are saver then the American list you find for LT and Truck tires, even saver then the European lists.

But I also made a RV tire-pressure calculator and put it in this map.
https://skydrive.live.com/?cid=a526e...E092E6DC%21793
To use a spreadsheet, first download it by RIGHTclicking on it , then choose download from the dropdownbox. After Download and eventual virus-check, open it in Exell or Open Office Calc. If you have one of those programs on your computer it is automatically openen in them when clickked on the document, if the settings are right on your computer.
Spreadsheets also in XLS for older Excell versions.
Dont click Left on the spreadsheets, then they are opened in a simple excell programm in the browser, wich cant handle some things I used in most spreadsheets.

But if you cant figure it all out , give here the details, and I will do the calculations for you.

Greatings from a Piggheaded Dutchmen
Peter
Attached Files
File Type: pdf 95psi100li143tire.pdf (75.1 KB, 19 views)
File Type: pdf 80psi98li141tire.pdf (75.4 KB, 29 views)
File Type: pdf 65psi95li138tire.pdf (74.9 KB, 22 views)
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Old 06-10-2013, 07:00 AM   #7
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thanks for all the help guys. I will have enough to go by now. Lots of information to calculate.
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Old 07-24-2013, 10:16 PM   #8
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Our 31 ft Chateau.......... 75 on the front and 80 on the rear. Also I learned that you do not rotates the tires . . . .
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