I just installed a Marathon race & i can't get the doppio negative to hold more than 50 PSI .
When i inject 100psi it stays at 50 psi ,so i inject 150 psi & it remains at 50 psi (this is when i recheck pressure status)
I presume that the Marathon XC "scale" pressure is the same?
the other air chambers hold fine......
Can someone enlighten me on what's going on with this?