Is there a high end shock pump? I have a sid world cup & it is tricky to calculate how much you loose when you unscrew the pump. I have heard that the fancy ones have no loss when you detach & i would be interested in finding out which one does that. I have a rock shox one - came with the SID I also have the wrench force. They seem to work about the same.Unless you have a defective pump or your schradder valve core is not screwed far enough, the air you think you lose when you disconnect the pump is actually the air in the pump's hose. You only lose air when you screw in the pump again, because it has to pressurize the pump's hose. This has been repeated to exhaustion again and again.

We need a sticky with this. On a related subject, if you want to know if you are losing pressure over time, what you should do is pump to a given pressure, disconnect the pump and reconnect again to take a measurement of how many psi you lose to pressurize the hose. Repeat this a few times to have an accurate measurements.

Then weeks later you can compare you pressure reading with the adjusted value to have estimate how much pressure you shock/fork is losing. Unless you have a defective pump or your schradder valve core is not screwed far enough, the air you think you lose when you disconnect the pump is actually the air in the pump's hose. You only lose air when you screw in the pump again, because it has to pressurize the pump's hose.

This has been repeated to exhaustion again and again. We need a sticky with this.I am not convinced this is true - but will take it under advisement when I make adjustments. I am pumping the negative air up to 140. Then I disconnect. I immediately re-connect and the pressure reads 110 or 115. Am i loosing air or just being impatient when I am pumping it up?

Should I be waiting longer to get an accurate reading? The negative chamber is much smaller than the positive. Hence, you'll see a larger pressure drop when you reconnect the pump. If you don't believe me, slowly unscrew the pump, and stop when you start listening to air coming out.

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If you're really losing pressure from the shock (possible but unlikely), all air will come out from the shock. If when it stops you still have air in the shock, that's because only the pressurized air in the hose escaped. Search the forum and see for yourself. Every beginner thinks the same. I was no exception. But, like I said, if the schradder valve core is not screwed in far enough you may be losing air from the shock. That happened to me with a Manitou shock.

I had to unscrew the pump as fast as I could, and even then I would lose more than half the pressure. The best shock pump is the one that should come free with the bike when you buy it. The LBS where I bought my new bike forgot to give me the pump that came with it. Gratis Style Dangdut Yamaha Psr 750. It looks pretty generic but works fine.

To dial in your bike fork or shock; pump it up to the suggested factory specs, then check the sag. Put in the air pressure needed to get the correct sag. Write down the pressure. As you ride the bike; you can change the pressure to 'dial in' your suspension so it rides like you want it to. Keep track of the pressure.

If you change pumps, the pressure readings may be slightly different. Forks and shocks are high pressure. If your shock or fork is leaking; it's going to leak a lot of air; you'll get way low readings like 40-50 pounds when it should be 150 pounds. Then, you've got a problem. I am pumping the negative air up to 140. Then I disconnect.