Hate to disagree with you guys, but 100 PSI will bring my front up to almost road height. I am carrying a little over 14,000 on the front. I know this for sure because those that have seen my driveway will understand I have to drop my front to get throught the overhead door, and raise the front once outside so the baffle under the generator doesn't get crushed on the crown of the driveway. So every time the bus goes into or out of the garage I have to run the front up and down throught its maximum range of travel.

My rears come to ride height with less than 100 PSI.

My old bus with about 13,200 on the front required full pressure and a lot of time to come up to the max height and 100 PSI (aux compressor cut out) would only bring it up if the tag was lifted.

I have 630126 (1R11 296) bags in the front. Now I am really curious about exactly what bags our coaches need to have. Since Tom's coach and mine are raising almost the same weight then it follows that our air bags are different because of the different pressures required. That leads me to conclude the 630259 is NOT a direct replacement for 630126.

The plot thickens. When Dr. Joe C. changes a set of fronts this coming weekend I hope he can get some measurements. Diameter when installed deflated (at full height), maximum extended height (mounting plate on bottom to mounting plate on top), pressure at ride height, pressure to fully extend.