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Bicycle floor pump weezing, whistling noise on the downstroke. Normal?
Posted by: d4
Date: June 01, 2020 12:23PM
The bicycle floor pump I just received is making this weird weezing/whistling noise on the downstroke. About 2/3 of the way down where I feel the air pressure build up. It pumps up the tire fine. But the noise is really strange. Like there's an airleak somewhere with the pressure. It's not the normal ffft, ftttt, fttt, pumping sounds.

The chuck is on tight to the tire valve. The sound is coming from the pump.

FYI: It's a Lezyne Classic floor pump. Backcountry had a nice sale on them.



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Re: Bicycle floor pump weezing, whistling noise on the downstroke. Normal?
Posted by: btfc
Date: June 01, 2020 12:43PM
Possible issues with o-ring(s) , lube, or check valve


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[www.lezyne.com]
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Re: Bicycle floor pump weezing, whistling noise on the downstroke. Normal?
Posted by: d4
Date: June 01, 2020 12:49PM
I contacted Lezyne and am awaiting a reply. I hope a trip to the post office to return the pump is not in my immediate social distancing future.



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Re: Bicycle floor pump weezing, whistling noise on the downstroke. Normal?
Posted by: mattkime
Date: June 01, 2020 12:53PM
nice pump



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Re: Bicycle floor pump weezing, whistling noise on the downstroke. Normal?
Posted by: d4
Date: June 01, 2020 01:13PM
Before this bike pump, I was using a hand pump with no gauge to pump up the tires of all our bikes. I was using the thumb squeeze method to test. Now that this new pump has a built in gauge I see that the air pressure in ALL the tires were wayyyyy off. Under-inflated by about 20-25%. Oops. My bad. LOL



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Re: Bicycle floor pump weezing, whistling noise on the downstroke. Normal?
Posted by: wave rider
Date: June 01, 2020 01:47PM
A lot of the pumps I’ve had used a leather “gasket” on the piston. A little oil on that would make the leather more supple and increase the efficiency of the pump.

That said, I’m still using a plastic Silca frame fit pump with a Campy head that I bought in the early ‘70s. Still works great!



=wr=
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Re: Bicycle floor pump weezing, whistling noise on the downstroke. Normal?
Posted by: Bo
Date: June 01, 2020 02:22PM
I have the same pump. It's pretty good but I do have a couple gripes. The service is basic as BTFC linked to and should solve your issue.

I find their alloy/plastic speed chuck really annoying. You need to physically hold it on the valve stem as it will blow off if not held in place. If you use the threaded portion, the release button is in the middle of the shaft so you have to be very careful while unscrewing that you don't release a lot of air.

I also don't really trust the pressure gauge and use a dedicated gauge. That said, I run ranges between 16-28 psi where small changes are noticeable in traction/performance and the gauge on this pump is for much broader ranges so I can't really blame the pump.
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Re: Bicycle floor pump weezing, whistling noise on the downstroke. Normal?
Posted by: jdc
Date: June 01, 2020 02:38PM
Quote
d4
Under-inflated by about 20-25%. Oops. My bad. LOL

99% of all flats are caused by under inflated tires.



----


Edited 999 time(s). Last edit at 12:08PM by jdc.
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Re: Bicycle floor pump weezing, whistling noise on the downstroke. Normal?
Posted by: neophyte
Date: June 01, 2020 02:45PM
Quote
Bo
I also don't really trust the pressure gauge and use a dedicated gauge. That said, I run ranges between 16-28 psi where small changes are noticeable in traction/performance and the gauge on this pump is for much broader ranges so I can't really blame the pump.

Many small gauges such as this are not very accurate. I would also double check the pressure with another gauge, at least to generate a correction factor for the built-in gauge.
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Re: Bicycle floor pump weezing, whistling noise on the downstroke. Normal?
Posted by: AllGold
Date: June 01, 2020 04:55PM
[A post of no help whatsoever:]

Are you sure it's the pump and not you? grinning smiley



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Re: Bicycle floor pump weezing, whistling noise on the downstroke. Normal?
Posted by: testcase
Date: June 01, 2020 05:05PM
"Are you sure it's the pump and not you? "


ROTFL
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Re: Bicycle floor pump weezing, whistling noise on the downstroke. Normal?
Posted by: Speedy
Date: June 01, 2020 06:20PM
Quote
testcase
"Are you sure it's the pump and not you? "


ROTFL

smiley-music039



Saint Cloud, Minnesota, where the weather is wonderful even when it isn't.
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Re: Bicycle floor pump weezing, whistling noise on the downstroke. Normal?
Posted by: M A V I C
Date: June 01, 2020 08:01PM
Quote
jdc
Quote
d4
Under-inflated by about 20-25%. Oops. My bad. LOL

99% of all flats are caused by under inflated tires.

I highly doubt that. When I worked at a bike shop, the majority of flats were from glass or other sharp items on the road, or blackberry vines.

In the southwest, goat heads kill tubes.




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Re: Bicycle floor pump weezing, whistling noise on the downstroke. Normal?
Posted by: Speedy
Date: June 01, 2020 09:48PM
Quote
M A V I C
Quote
jdc
Quote
d4
Under-inflated by about 20-25%. Oops. My bad. LOL

99% of all flats are caused by under inflated tires.

I highly doubt that. When I worked at a bike shop, the majority of flats were from glass or other sharp items on the road, or blackberry vines.

In the southwest, goat heads kill tubes.

Hmmm, every flat I’ve ever had involved under inflated tires. Ever seen a flat on a fully inflated tire?



Saint Cloud, Minnesota, where the weather is wonderful even when it isn't.
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Re: Bicycle floor pump weezing, whistling noise on the downstroke. Normal?
Posted by: M A V I C
Date: June 01, 2020 09:52PM
Quote
Speedy
Quote
M A V I C
Quote
jdc
Quote
d4
Under-inflated by about 20-25%. Oops. My bad. LOL

99% of all flats are caused by under inflated tires.

I highly doubt that. When I worked at a bike shop, the majority of flats were from glass or other sharp items on the road, or blackberry vines.

In the southwest, goat heads kill tubes.

Hmmm, every flat I’ve ever had involved under inflated tires. Ever seen a flat on a fully inflated tire?

Yes. Almost always these days.




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Re: Bicycle floor pump weezing, whistling noise on the downstroke. Normal?
Posted by: Filliam H. Muffman
Date: June 01, 2020 11:59PM
When I was living in Sacramento, I had five flats in a year from goat heads on my road bike on the American River bike paths. The goat heads are everywhere. I installed something very similar to Mr. Tuffy tire liners.



In tha 360. MRF User Map
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Re: Bicycle floor pump weezing, whistling noise on the downstroke. Normal?
Posted by: tenders
Date: June 02, 2020 05:17AM
PSA: “goat head” - a vegetative-, non-mammalian-based annoyance.

[en.wikipedia.org]
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Re: Bicycle floor pump weezing, whistling noise on the downstroke. Normal?
Posted by: d4
Date: June 02, 2020 08:23AM
Response from Lezyne customer service:
Sometimes new pumps have this harmonic that develops between the piston o-ring vibration and check valve plunger in the base. It usually goes away with some use.

Okaaaayyy.... Like buying a new pair of shoes that cost double the price of average shoes. Putting them on for the first time only to hear them squeak with each step. Company response: Oh the shoe squeak is normal. Just keep wearing the shoes. It usually goes away with some use.



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