sr5bidder said:
DBD: thought I read somewhere that the compressed airis not so good for some reason.
I wonder if a tire shop would do it for less momey (nitrogen)
In theory, nitrogen is better for several reasons.
1) Compressed air usually has lots of moisture
2) Air may over time be more damaging to the rubber bladder than nitrogen
3) In the event of a catastrophic failure, compressed air could be an explosive bomb
4) The nitrogen may expand less than the moisture filled air as it heats up, so the pressure in the bladder stays more consistant
In practice, the bladders are thick rubber and not likely to fail due to contact with air. Shock bodies are aluminum and unlikely to create a spark in some sort of freak crash that ruptures the reservoir. Mild changes in pressure as the air in the reservoir heats up are unlikely to make a noticeable difference in shock performance.
Hey, use pure nitrogen if it is available, but if you have to use air, don't stress about it. FWIW, air contains a large amount of nitrogen anyways.