Community Forums

Jack1234 · 06-27-2011, 06:59 PM

I appreciate that this topic has been discusses over & over, but I would still appreciate a little advice to insure that I have got this important item correct.

We recently purchased an 04 Rexhall (37') DP. Not long after the purchase we realized that we needed to replace the original tires and we purchased 6 new 265/75R/22.5 Toyo's. Being new to the DP Coach game we went along with tire shop's inflation advice of 100psi "all round". Subsequently, we found this site and the discussions cocerning the proper way to set the tire pressure(s). As an aside, the 100psi left us with Coach which tracks true& straight and has a smooth silky ride.

Anyway, we got the Coach weighed - 27,500 ( max GVWR - 31,000) & our Honda Civic dingy - 2,662 for a total GCWR of 30,162 (max GCWR rated for 41,000). The Coach is pretty well balanced from side to side with FrtR axle being the heaviest at 4,825 & the heaviest rear axle 9000.

I then went to the Toyo "load / pressure" chart & it suggest 95psi for the front & 85psi for the each of the rear duallies. (cold)

Does this sound correct? Have I overlooked anything. Many thanks for any comments or advice & apologies for rehashing this subject.

Cheers - Jack

fxdave · 06-27-2011, 08:25 PM

im running 110

Gary RVRoamer · 06-28-2011, 08:10 PM

Sounds about right to me, given your weights and the tire size. I would say you probably read the tire chart correctly. If in doubt, add 5 psi to what the load table says.

Jack1234 · 06-28-2011, 09:06 PM

Hey Dave...if I am reading the Toyo chart correctly your front axle would be around 10,500lbs & your rear axle around 19,000lbs for a total Coach weight of around 30,000lbs in order to justify 110psi. Are you running that heavy?

Cheers....Jack

offthewall · 06-28-2011, 09:21 PM

Quote:

Originally Posted by Jack1234

I appreciate that this topic has been discusses over & over, but I would still appreciate a little advice to insure that I have got this important item correct.

We recently purchased an 04 Rexhall (37') DP. Not long after the purchase we realized that we needed to replace the original tires and we purchased 6 new 265/75R/22.5 Toyo's. Being new to the DP Coach game we went along with tire shop's inflation advice of 100psi "all round". Subsequently, we found this site and the discussions cocerning the proper way to set the tire pressure(s). As an aside, the 100psi left us with Coach which tracks true& straight and has a smooth silky ride.

Anyway, we got the Coach weighed - 27,500 ( max GVWR - 31,000) & our Honda Civic dingy - 2,662 for a total GCWR of 30,162 (max GCWR rated for 41,000). The Coach is pretty well balanced from side to side with FrtR axle being the heaviest at 4,825 & the heaviest rear axle 9000.

I then went to the Toyo "load / pressure" chart & it suggest 95psi for the front & 85psi for the each of the rear duallies. (cold)

Does this sound correct? Have I overlooked anything. Many thanks for any comments or advice & apologies for rehashing this subject.

Cheers - Jack

Sounds feasible. I personally would add +5psi just as a safety margin in case you wind up carrying more weight temporarily. That would put you right back at 100 for the fronts and 90 for the rears.

My coach side walls and the door sticker recommend 110psi all around. Reading the Michelin charts +5psi, I'm running 90psi in the fronts and 100 psi in the rears on my Itasca 34Y DP for my travel weight.

fxdave · 06-29-2011, 06:54 AM

jack how do i find out ? i have a 97 holiday rambler endeavor wds ? this is what i ran in my goodyears an bridgedstones was 110 so that is what i have here if you can advise plse do thanks !

Jack1234 · 06-29-2011, 08:15 AM

Dave....I'm with you...I thought tire pressure was like my car where you could consult the owners manual and go! However, after reading several of the excellent threads on this topic I have come to appreciate that truck/Motorhome tires require a little more work.

Anyway, it is my understanding that the first step is to have all four/six of your corner across weighed (full running weight....fuel, water,passengers, etc). Once you have your corner weights refer to the tire manufacturers load & pressure chart for the correct psi. While you could set psi's for each corner I think as long as your RV weight is pretty much balanced "side-to-side" you can set the fronts to correspond to your heaviest corner and the same for the rear (tag axles a bit more complicated) ****I think this is the correct procedure but if someone with more experience wants to add a correction or clarification I hope the will.

For Toyo tires the load/pressure chart is on the second last page of this site.... http:market.toyotires.com/file/breads.pdf

Cheers

offthewall · 06-29-2011, 08:38 AM

Quote:

Originally Posted by Jack1234

Dave....I'm with you...I thought tire pressure was like my car where you could consult the owners manual and go! However, after reading several of the excellent threads on this topic I have come to appreciate that truck/Motorhome tires require a little more work.

Anyway, it is my understanding that the first step is to have all four/six of your corner across weighed (full running weight....fuel, water,passengers, etc). Once you have your corner weights refer to the tire manufacturers load & pressure chart for the correct psi. While you could set psi's for each corner I think as long as your RV weight is pretty much balanced "side-to-side" you can set the fronts to correspond to your heaviest corner and the same for the rear (tag axles a bit more complicated) ****I think this is the correct procedure but if someone with more experience wants to add a correction or clarification I hope the will.

For Toyo tires the load/pressure chart is on the second last page of this site.... http:market.toyotires.com/file/breads.pdf

Cheers

The door sticker pressures are assuming you are at your max CGVWR. In most cases a four corner weigh will reveal that your fully loaded RV is quite a bit under CGVWR. In that case, consult the tire manufactuers table and set your pressures for the weight on each axle. Always run equal pressures on all tires on a given axle. Set both sides to the higher pressure. I always add +5 psi for safety.

bbeane · 06-29-2011, 09:57 AM

Jack1234, you said your coach handles good and rides smooth, 100 psi all around might be a little high on the rear, but if it your coach likes it leave it alone. Check your tire pressure often (when the tires are cold) and roll on. 5-10 lbs is not going to hurt your tires one way or another when you are talking between 90-100 psi when in doubt it's always better to be on the high side.