I did it one-armed, and probably got it up to about 100 psi (boast post?) but it was showing 20 on the gauge.
strange as mine reads ok. Maybe your valve core or the way the adapter fits your pump is to blame?
It might be the latter as the Zipp adaptor which didn't fit on the wheel fit really nicely on the pump and gave an accurate reading.
@neil-bah started
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I did it one-armed, and probably got it up to about 100 psi (boast post?) but it was showing 20 on the gauge.