Pumping
03-05-13 | 11:35 AM
#1
Thread Starter
Senior Member
Joined: Feb 2013
Posts: 180
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From: New York
Pumping
Ok so I have an issue.
Every time I go to pump my tires, which I wait a week, and I pump them to 115.
But anyway so I go to pump them and I give them one pump and the Guage says like 120, then another pump and it's like 130. It's completely unpredictable it slowly goes down when I do this.
Am I suppose to let air out before pumping tires?
Is my pump Guage ********?
Every time I go to pump my tires, which I wait a week, and I pump them to 115.
But anyway so I go to pump them and I give them one pump and the Guage says like 120, then another pump and it's like 130. It's completely unpredictable it slowly goes down when I do this.
Am I suppose to let air out before pumping tires?
Is my pump Guage ********?
03-05-13 | 11:42 AM
#2
Senior Member
Joined: Jan 2011
Posts: 259
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From: In The Middle Of "Out There" / Downtown "Lost Angels"
Bikes: 2001 Trek 520 - Hvy Hauler, Epic Adventure Bike / 2011 Fuji Newest 1.0 - Sporty Quick Bike
just guessin' at those pressures, I'm assuming skinny road tires and presta valves? If so, did you *burp* the valve before attaching pump hose?
03-05-13 | 12:03 PM
#6
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Joined: Jan 2011
Posts: 259
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From: In The Middle Of "Out There" / Downtown "Lost Angels"
Bikes: 2001 Trek 520 - Hvy Hauler, Epic Adventure Bike / 2011 Fuji Newest 1.0 - Sporty Quick Bike
Yes, on most high pressure PRESTA valves ( non automobile type valve ) tires *It Is A Very Good Habit To Just Give The Valve A Very Brief *POP* with a finger so that a very short 'PSST' sound is heard.
This is very important in that it breaks the *glueing effect* that occurs between the valve sealing gasket and the internal valve seat.
This is very important in that it breaks the *glueing effect* that occurs between the valve sealing gasket and the internal valve seat.
Last edited by HvPnyrs; 03-05-13 at 12:12 PM. Reason: format
03-05-13 | 02:09 PM
#8
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Joined: Aug 2011
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From: CID
Bikes: 1991 Bianchi Eros, 1964 Armstrong, 1988 Diamondback Ascent, 1988 Bianchi Premio, 1987 Bianchi Sport SX, 1980s Raleigh mixte (hers), All-City Space Horse (hers)
Burping will help, but keep in mind that bike tire gauges aren't super-accurate. They might not measure the same when new, and have a tendency to go out of calibration with use. Just get your tires in the ballpark and everything will be fine.
