nitrogen

No significant pressure loss. We checked shocks the night before each track event (practice or race) and topped them up with air using a high pressure hand pump. Never had to add more than one pump. We checked pressure before going on track but never had to top up. Been sitting in a cold garage all winter and now only down 20 psi. Your mileage may vary.
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nitrogen

the nitrogen kit for the top of the tank I bought years ago from amazon for about 300$.
the tank and gas I get from my area gas supply store. I bought the tank so it's an exchange when I need it refilled.
with the none upgraded shocks we charge them every morning before we would head on on track. the new upgrade kit for the shocks I have no idea how often they will need to be topped off? my plan is to check them like I was doing with the old shocks. and will see how it goes from there.

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