• Wheel O-Rings for 20" Two Piece Combat RIms


    These O-Rings are for the M939 series 5 Ton two piece combat rims as well as the M35A3 two piece combat rim.  CTIS O-Ring package only fits the M939A2 series of trucks, not LMTV or M35A3 CTIS.  

    HEMTT and FMTV O-Rings are available following this link.

     Always clean the two mating surfaces of any rust and debris before installing the new o-ring.  I personally like to take the time to lightly sandblast and then paint the two surfaces.  However, a wire brush should be just as effective but may take a little more time to clean out.

    Can also be purchased with the new valve stem grommets.  Many times the valve stem is good but it's a wise idea to replace the grommet for it at the same time you are replacing the large o-ring.

    What's in the box?

    • One o-ring, unless selecting the multiple o-ring sets

    These o-rings only fit the 5 ton combat rims that use the larger studs to hold the two rim halves together.  So if you would use a 15/16 socket to take the rim apart, this is not the o-ring for you.  If you have to use a 1-1/8 socket to take the rim halves apart then yes, these are the o-rings you need.  We will not sell o-rings for the smaller studs.  There is too much of a known issue with that style of rim to seal correctly that if we were to sell those o-rings no matter how high of quality they are, when your rims don't seal you will blame the o-ring and not the rim.  The rims are the problem, not the o-ring.  We will happily supply you with new rims,as we've done with many other customers, to replace your other rims.

    Here is an important video about o-ring shape.