G670/Journey Tire Pressure Question

bellsharbor · 05-10-2007, 02:11 PM

I installed the G670 275/70R22.5 this last year and I finally got the coach weighed this week. I am now trying to figure out where I want keep the tire pressure. The weight of the coach is well below where the Goodyear tire chart starts. I have been running at 95lbs and think it is too harsh. Looking at the chart it seems to indicate 80lbs or less as I am weighing in around 24,700. I would appreciate any information on your experience? Thanks---

bellsharbor · 05-10-2007, 02:11 PM

I installed the G670 275/70R22.5 this last year and I finally got the coach weighed this week. I am now trying to figure out where I want keep the tire pressure. The weight of the coach is well below where the Goodyear tire chart starts. I have been running at 95lbs and think it is too harsh. Looking at the chart it seems to indicate 80lbs or less as I am weighing in around 24,700. I would appreciate any information on your experience? Thanks---

smlranger · 05-10-2007, 05:36 PM

John:

I've got the same tires, same rig. Since I have never been able to get individual wheel position weights, only axle weights, I chose to add a fudge factor. I run 105 in the fronts and 95 in the rears. Based on the inflation chart, I could run 85 in the fronts (assuming I've got even weight distribution on that axle). Since I changed to Koni shocks, the ride is very good so I may leave the tire pressure alone. I do belive I could lower the pressure on the fronts.

NeilV · 05-11-2007, 12:35 AM

<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by bellsharbor:
I installed the G670 275/70R22.5 this last year and I finally got the coach weighed this week. I am now trying to figure out where I want keep the tire pressure. The weight of the coach is well below where the Goodyear tire chart starts. I have been running at 95lbs and think it is too harsh. Looking at the chart it seems to indicate 80lbs or less as I am weighing in around 24,700. I would appreciate any information on your experience? Thanks--- </div></BLOCKQUOTE>

John,

Go by the charts after at least getting each axle weighed. The inflation values in the charts are to carry the weight without having the center of the tread buldge in or out causing uneven wear. Overinflate and the center portion of the tread will wear out before the edges, underinflate and the edges will wear out prematurly. Either way ride, handling and treadwear will suffer.

ichn2go · 05-11-2007, 01:49 AM

You will get several different answers to this question..Seems like Gary and I think alike, I too like to add a fudge factor.
Yes higher inflation than the chart recommends "could" be detrimentle to the tire. Yet I had rather err with a little extra weight to carry than be low..
If your numbers are right reduce the pressure by 5 lbs and see it you are happy with the steer and the ride. Find a happy medium in the pressure that you like and stick with it. I know the charts say you can run a much lower pressure but in my way of thinking a tire that has 110 on the sidewall and the manufacturer recommends something like 95/90 ,,,,80/85 seems rather a large amount to reduce the pressure.

To each his own but I vote for a fudge factor.

Good Miles

RLS · 05-11-2007, 04:05 AM

bellsharbor
We have the same rig and I played with tire pressure until I settled on 105 front and 100 rear. This combination gives me the best performance, handling and safety margin.

bellsharbor · 05-11-2007, 12:22 PM

Thanks everone for the information. I may try to lower the pressure just a bit. Bob---are you running the G670's? Happy travels---

RLS · 05-11-2007, 05:45 PM

bellsharbor

Yes, I am running the Goodyear G670 275/70R22.5.

El Jeffe · 05-12-2007, 01:09 AM

I have the same tires and came to the same conclusion as Gary, except I do have 4 wheel individual weights and I was pretty even sise-to-side (500 pounds difference in the fronts.

With the increase in load range on the GY vs the Michelin XRV the carrying capacity of the GY is a lot higher at a much lower pressure.

I decided to run 105 in the fronts and 100 in the rears. I don't think that the ride is that harsh.

I can say that handling improved a lot when I changed from the Michelin 255/80/22.5 to the GY 275/70/22.5.