BAC Forum
General Boards => Technical Support => Topic started by: Andrew Bruemmer on July 08, 2017, 05:04:05 AM
-
I'm wondering what do you guys do for your tire pressure? We had a TT and the majority for that seemed to set PSI to the max cold on the trailer tires. For my 2002 Contessa the placard in the coach gives 115psi for all tires. The new tires we have put on are 135psi max. Should I use 115psi for all? I've seen some things were people said the steer tires could be higher than rear? So do you guys go by the tire max or the info given on the placard in the coach for setting your PSI?
-
You should get a 4 corner weight on your coach. Then get the tire inflation charts for the tire you bought. Set according to the chart making sure all tires on the same axle are set for the same pressure. If you have a tag I suggest using 10 K for the setting for that axle and use 5k for the calculation (10k *2k =5k). There are a lot of tutorials on the internet to get you through it.
Brief but I hope it helps.
Jerry
-
Is a 4 corner weight something that can be done at a CAT scale?
-
Others here have done it but I haven't been able to find a Cat scale that isn't too busy for that. Some use weigh stations on highways, scrap yards or moving company scales. I used a service like http://www.rvweigh.com/, can't remember the name. Their home base is close to my home but they routinely go to rallies and such.
Jerry...on edit... I found the one I used out of Central FL http://www.rvsafety.com/
-
We used an Oregon ODOT truck weigh scale near Hat Rock Park East of Umatilla, OR. It was not manned at the time, but they leave the scales powered on and there's a remote digital-weight readout in front of the scale. We were loaded with fuel and water with the waste tanks empty, and leaving on a trip to Spokane so it was good timing. We did not take the time to get corner weights but did get axle weights. Two things I found out: 1) The front axle was right at the maximum for the tires when inflated to their maximum cold pressure - 120 psi on 295/80R22.5 tires. 2) The overall weight of the coach was about 42,500. With the Avalanche in tow the combined weight was near 49,000 pounds.
As a result of my weighing I 1) immediately reduced the downward tag tires' pressure to reduce the weight on the front axle, and 2) checked the tire charts and started using maximum cold psi (120) on the front axle, 115 psi on the duals, and 110 psi on the tags. Under two years later I noticed short, radial cracks in the front axle tires. These cracks were about 3/4" long and right next to the metal wheel near the bead seal. Soon after I switched both front tires out for 315/80R22.5 which I run at 125 psi. They have a 130 psi maximum cold pressure with a 9,090 pound rating; now well over the front axle weight.
-
Thanks guys! Looks like I have some reading up to do.
-
Andrew,
All the info you should need is available in the Technical section of the BAC web site. Select Common Problems and Tire Info. Here is the link. http://beaveramb.org/acadp_listings/tire-inflation-guidelines/
Steve