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To all who are interested. Mission Accomplished. The black ring, part #12342633, worked for me. After fully tightening down the wheel bolts, its holding 30 pounds of pressure no problem. If anyone ever tightened the wheel nuts down to 125 lbs/ft - I would like to meet them and buy them a...

The red o-ring I tried that did not seal the wheel is 3/16" part #12460338 from hummerpartsguy. The original o-ring in the wheel was black and although compressed into a triangular shape, measured 1/4" wide. I'm going to try o-ring part #12342633 which I believe is 1/4". I should get it...

Action: What do you make of these photos? This is the original black o-ring that was in the tire.

Here is what the above suggestion looks like. It seems promising but I'm not sure it will keep the wheel still as the bolts go lower. FYI - these bolts only turn 1 or 2 times by hand, even with fully greased thread. I will let you all know how it goes.

Thanks Doc. I feel like I read everything on tire changes on the internet including on G503. I researched it for a week and now likely have 10+ hours of my own labor into one tire change. It seems the wheels were just not designed to replace the tire - especially in the field. Without...

I just took apart the wheel and here are some pics. Does anything look wrong? Bolts are 1/2"-20 btw. Bolts backed off. Alignment holes. O-ring put back in place. It moved while removing outside half of wheel so I could not see any issues. Closeup of O-ring at valve cut out on run...

Doc - I'll try those two as well. Thank you.

I just took apart the wheel and here are some pics. Bolts backed off. Alignment holes. O-Ring in grove. O-ring came out when I took off the top so could not see any issues. Closeup of O-ring at run flat valve cut out. Last is bottom of outside half of wheel.

Thanks for the quick reply Action. That is an excellent idea. When I was tightening in the very beginning I kept checking the o-ring alignment all the way around until my finger couldn't fit. It moves easily and likely shifted somewhere. I'll definitely do this on my second try and keep you...

Tire change update - need help. After finally getting the run flat into the new tire and fully reassembling the wheel - air is leaking at the alignment hole. I believe I followed the TM carefully. Prior to installing the run flat into the tire, I liberally applied the run flat grease inside...

Hey all. I still haven't changed the tire I need to. I was hesitant to use my 3 ton floor jack and jack stands. Will they be sufficient? What do some of you all use? Thank you.

Thank you all. I'm much more confident now and I may try it tomorrow.

When my M1152 was finally delivered a few weeks ago, I discovered the right rear tire was bald. I ordered and received an identical tire from fleabay. What exactly is the procedure for changing the tire? Are there general instructions in a thread on the forum? Where is this found in the...