I bought a Racer X with a 5th Element Air shock...I was attempting to set up the correct sag by following what the users manual said and other literature. However, to get ~10mm/20% sag I only have to fill the main chamber to about 90 psi, and thats with filling the IFP chamber before hand to 85psi. And being I'm 170 lbs, I'm a bit concerned about how low the main chamber psi is, considering that most everything I've read, most are filling the main chamber much higher (120-140) at equal body weight and stating that the owners manual suggests a psi that tends to be a bit low. Is this low psi issue due to the factory preload, type of bike, or am I worrying about nothing. Has anyone had a problem like this? Any suggestions would be greatly appreciated..Thanks.