Originally Posted by
AndyK
I usually just add air, as opposed to releasing most of the air and pumping. Could that cause more pressure build up in the pump, to skew the results?
I suppose you are talking about letting all the air out of the tire first. Pressure is pressure. You can just add air.
Originally Posted by
AndyK
To make matters more complicated, I pump using my ancient Silca Super Pista pump, whose gauge shows 110. When I check my pocket gauge, it shows 85 psi.
It looks like the gauge on the Silca is way off.
Note that your pocket gauge could be off too!
You really don't know
which gauge is more accurate since they each (it appears) give different results.