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Been using a JoeBlow Max pump for a while , it has a gauge on it, when i pumped up some tyres with schraeder valves i pumped them to whatever psi i wanted then double checked the pressure with another seperate gauge but the difference was considerable.
Now mostly i run presta valves and dont have a seperate gauge to check them so i rely on the pump gauge, but if its out so much is it a bit hit n miss and not worth looking at, instead use my old fashioned squeeze tyre method for pressure.
Anyone else find this?
I've got a Joe Blow Sport pump and the pressure reading on it matches with my digital Topeak gauge.
good question, all i know is that the dials on mine wobble around a bit in the window, so im guessing around +/- 3psi.
My Bontrager gauge gives about 5psi difference compared to my Blackburn.
Training your thumbs to feel the right pressure is probably worthwhile, especially for when you fix a puncture on the trail.
I've got a Park track pump and it is fairly accurate, however as I'm not riding a Moto GP bike or F1 car, the tyre pressures are not critical. I don't check pressures before every ride, I use the thumb method, if it feels about right it will be ok.
I had to replace my 8-10 year old Diamondback floor pump this winter. When I got the new Lezyne pump, I joined both pumps together via a short piece of tubing. Both gauges read the same. I was impressed as the old pump usually spent 6 months of the year in the covered bed of my truck!
My Joe Blow floor pump reads around 4-5psi higher than my digi-gauge.
Bought a digital gauge last week (Halfords - £14.99) and did a quick comparison. The track pump and digital gauges agreed above 30/40 psi but below that there was quite a divergence.
WMB did a trackpump test recently and saw vast differences in gauge accuracy. You need to find something to calibrate against....car tyre with known pressure (garages are obliged to have accurate gauges and they are usually under a service contract).
I have a minipump that shows 35psi against a trackpump of 20psi, so whilst it may not be F1, it is an issue.
PaulD
I think mines about 10psi out, but it seems consistent if nothing else so still useful.
I think the key thing is a consistent gauge. If X psi on your guage works for you it matters not if its the same as some one elses X psi