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Question about topeak pumps
Hi there,
Bit of a dumb question but I just bought a Topeak Joe Blow mountain pump.
http://www.topeak.com/products/pumps/jb_mountain
My question is is the yellow indicator on the pressure gauge ment to move as you pump? On mine, it doesn't move. The only way it moves is if I move it by hand.
Thanks for any help
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Great pump, I have the same one. The yellow indicator is manually set and doesn't move as you pump.
Cool, thanks for that. I'm tempted to get a separate tyre pressure gauge. Seem to be losing a lot of air when removing the pump.
Anyone tried this?
http://www.cellbikes.com.au/PRO-Digital-Pressure...
I've had the BBB equivalent for a few years, it's a great piece of kit and only weighs a few grams. Sits in my Camelbak permanently.
Hey Hawkeye
Does the BBB pressure gauge let out much air when you are checking the pressures? Is it consistent with its readings?
You lose the air in the pump chamber and hose when disconnecting the head from the valve. I've had the older version of this pump for about 6 years and it is still great.
Was your question about the yellow indicator regarding the gauge needle, or the movable flag? The needle should indicate instantaneous system pressure (jumps up and down during the pump stroke).
Regarding digital gauges, I have the Topeak D2, which allows very minimal pressure loss when connecting/disconnecting.
The needle moves but the movable flag doesn't. I have to turn it manually. I'm not sure what the point is by having this yellow indicator. I just use the needle position to get the pressure reading. I can see some of the air relased would be from the hose but if you undo the yellow lever and leave the pump head on the valve air would still escape until you pull the pump head of the valve. The quicker I pull the head off the valve the less air seems to escape. I find it is bit awkward to get the head off quickly.
The flag is there for forgetful people, or the general populace who ride 3 times per year, to remind them of what target pressure to run. The first car I built had a similar flag on the tachometer so if I let someone else borrow the car I could set red line lower.
I think I've just got used to putting my thumb over the alternate valve head when removing the pump from the valve. Alternatively, you could possibly put an M8 bolt in the Schraeder valve head and flick the lever from Presta to Schraeder in one movement reducing the chance for lost air.
/edit/ peed in poPulace
there is review of this pump in this months mountain biking australia
like it was said in a thread for us blind & forgetful ppl it is a indicator to see what tyre pressures we like too run without searching for our glasses everytime ...