Proper Tire Inflation - Help

[Caigerbitzens]

Ok -

Need some edumacation here. I have an Adventurer 35U on the 20.5k Ford Chassis with Goodyear G670 RV tires.

Recently I took the RV in for a routine check-up and lube (bought it used last November) as a prep for my first season of RV fun. While I was reviewing the service notes the tech made a comment about setting all the tires to 75 psi which I didn't think much of at the time but when I got home I remembered all the posts on this forum and nowhere did I see anyone mention setting their tires that low.

So, since I recalled most manufacturers put tags in the driver door jam with proper inflation I went and checked the tag, which says 70 psi front and back (I guess at this point I am making the assumption that the G670's are factory standard). Again, that just didn't sound right so today I went to the www.goodyear.com/rv site and DL'd the inflation tables which seem to indicate that even at the lowest weight per tire/axle (about 5300 lbs) I shouldn't be below 85 psi on any of the tires.

Can someone with a similar rig give me some insight (I know load dictates "proper" inflation) on the operating pressures they keep their rigs at?

Appreciate any help you all can offer.

Regards -

Craig

[Caigerbitzens]

Ok -

Need some edumacation here. I have an Adventurer 35U on the 20.5k Ford Chassis with Goodyear G670 RV tires.

Recently I took the RV in for a routine check-up and lube (bought it used last November) as a prep for my first season of RV fun. While I was reviewing the service notes the tech made a comment about setting all the tires to 75 psi which I didn't think much of at the time but when I got home I remembered all the posts on this forum and nowhere did I see anyone mention setting their tires that low.

So, since I recalled most manufacturers put tags in the driver door jam with proper inflation I went and checked the tag, which says 70 psi front and back (I guess at this point I am making the assumption that the G670's are factory standard). Again, that just didn't sound right so today I went to the www.goodyear.com/rv site and DL'd the inflation tables which seem to indicate that even at the lowest weight per tire/axle (about 5300 lbs) I shouldn't be below 85 psi on any of the tires.

Can someone with a similar rig give me some insight (I know load dictates "proper" inflation) on the operating pressures they keep their rigs at?

Appreciate any help you all can offer.

Regards -

Craig

["007"]

Craig, on that tag you were looking at it will have axel weight limits of both axels also.
With a loaded weight of LP,water you will carry, full gas tank an loaded for your camping trip go to a CAT scale an they can give you each axel weight of your loaded coach. About $8. Than use your GY inflation table for your tires with the weights you got weight on your sheet. You may have different weights for each of your axels so you will have a different psi. Use the same psi for each tire on that axel. Someone elses rig may be loaded heavery or lighter than yours. ---"007"

[Fred B.]

Craig,
I have a 00' adventurer 35 U on the Ford 20,500# chassis. I had it weighed at a public scale. Front 6,510#s Rear 12,310#s & this was loaded w/full tanks ready for the road. With these figures 70#s would be allright but I carry 75#s per tire. I don't know what year you have, but mine came with Goodyear G-159s. Have replaced the 2 front w G-670s & really like the ride. I'll soon replace the back 4 & spare with G-670s. The inflation rate schedule is the same for the G-670s as the G-159s. 85#s per tire on that chassis would be way too much.

[Stan Birch]

Dunno how Winnebago arrived at their 70 lb. figure, but it's too low, especially for the front; and will cause premature shoulder wear and scalloping.

On my 32, I run 80 lbs. in front and 75 for the rear. It's surprising how much easier the rig is to handle and steer with more appropriate pressures rather than the factory recommendations.

You seem to be on the right track for your 35.

[Fred B.]

Stan,
Is that metric#s or US#s. Goodyears inflation table agrees with Winnebago.

[Stan Birch]

<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by Fred B.:
Is that metric#s or US#s. Goodyears inflation table agrees with Winnebago. </div></BLOCKQUOTE>
We don't use metric for those kind of measurements up here. 80 psi would be about 11 kilopascals in metric.

The pressures I use are consistent with measured weights of the rig fully loaded.

[no18yes]

I also keep mine at 80# front and rear. Rotate every 5K. Just made a trip to Georgia and back (Oregon) had not a lick of tire problems.

[R Gordon]

On my 2002 35U Adventurer, the label on the door says to inflate all tires to 85 psi. Mine is on the Ford 22,000 lb chassis. Have the Goodyear G670's. The tires might be larger size or they are allowing for extra weight factor. Never had any issues and have never weighed motorhome. I do know that low pressure in tires create more heat buildup and causes blow outs. It would be nice to use nitrogen instead of air, similiar to Nascar, that way pressures would not fluctuate due to temperature. Happy RVing!!!!

[Dsouthw524]

Just a point not made by anyone here! The weights for truck tires are MINIMUM pressures. Tires deflate normally. Therefore, it is adviable to inflate more than the minimum to accomadate the loss.

[Tom N]

Since air is &gt;70% N2 there is not much difference in pressures fluctuate.

[Tom N]

<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by dsouthw524:
Just a point not made by anyone here! The weights for truck tires are MINIMUM pressures. Tires deflate normally. Therefore, it is adviable to inflate more than the minimum to accomadate the loss. </div></BLOCKQUOTE>

I have never heard of a tire manufacturer advise over inflating tires to accomadate for air loss!