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  1. #1
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    Bontrager Shock pump question???

    Bontrager Shock pump question....just looking for affirmation. Just picked up a Scratch Air 9 yesterday, and I didn't notice the pump I was given reads at approx. 20psi when it is unpressurized. Is it safe to say that I should look at the 20psi reading as 0psi and just subtract 20psi from the measurement is receive on the gauge. ie: 240psi on gauge=220psi


  2. #2
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    At work I calibrate pressure gauges and other things. You cannot assume that the error your seeing is linear. It's a cheap gauge and most likely the error is already at least 5% when new. That doesn't mean you can't use it though. Adjust your pressures according to the recommended "sag" and not what the gauge reads.

  3. #3
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    Quote Originally Posted by Gary H View Post
    At work I calibrate pressure gauges and other things. You cannot assume that the error your seeing is linear. It's a cheap gauge and most likely the error is already at least 5% when new. That doesn't mean you can't use it though. Adjust your pressures according to the recommended "sag" and not what the gauge reads.
    ^ This!

    I have 4 shock pumps from different companies, everyone gives a very different reading. Figure out what your correct sag is, with one pump, and then only use that pump.

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