Originally Posted by
DaveSSS
With all this discussion about tire pressure, I decided to check the accuracy of my 30+ year old Silca pump. I have two brand new liquid filled 0-100 psi gauges on hand, so I made up a manifold with both gages on it and a presta valve stem. I found that both gages agreed within 2 psi at 80, but my pump mounted gage read about 8 psi low, so my 70 psi front tire was really only about 62. I now reference the 6 bar mark as 80. I'll now try an honest 70 front and 75 rear.
My old cheapo Performance Hurricane track pump (still has the best pump head ever) was probably 7-10 psi low compared to my SKS Airchecker gauge. My new Joe Blow is close enough to the SKS Airchecker that I just use its gauge.