Stack Exchange Network

Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange

Questions tagged [pump]

Bicycle pumps pump air into tires and suspension forks.

2
votes
2answers
83 views

How would I go about getting this Zefal pump to work with a Schrader valve?

I have a seemingly well-functioning Zefal pump that I'm unable to identify that has a head on that I'm also unable to identify (maybe it's just Presta?). All my family's bikes use Schrader valves. ...
3
votes
2answers
72 views

Pump for small tires

What is the best pump for small bike tires with narrow spokes? The pump head we have is large and is hard to place over the valve on our 20 inch tire. I've tried pump extenders but they are screw ...
0
votes
2answers
250 views

How can I inflate a presta tyre with just one hand

I'm trying to inflate my bike with thin presta tyres; but the pump I'm using is universal, it fits loosely. I need to keep one hand in the valve in order to inflate but on reaching 50 psi, I need ...
1
vote
3answers
74 views

Do I need a new tire pump or can I fix my old one?

My old bike pump psi gage shows a different pressure than my newer hand held tire gauge. Is there a way to fix the pump or do I need a new one?
8
votes
2answers
3k views

How does this hand pump work

Some time ago I bought this pump. It should be usable for all valves, but I'm not sure how that is supposed to work and it didn't come with a manual. On one side there's a lever, on the other side (...
4
votes
4answers
151 views

Are there any mini pumps that can be mounted on a wide rectangular frame?

On my previous MTB (a hard tail from 2002), I had mounted a mini pump (not sure which brand) under/next to the bottle cage. The pump came with a frame mount and a velcro strip to secure it in place in ...
3
votes
1answer
151 views

What size are the replacement o rings in the prestacycle set?

https://www.crosslakesales.com/products/prestacycle-prestaflator-tool-rebuild-kit-o-ring-new I asked the company that manufactures them, they said they didn't know. Idiots. Does anyone know the ...
5
votes
1answer
340 views

How to clean sealant stuck in pump head?

I have a old trusty pump that over the years has the presta head filled with tubeles goo. Noways it pumps the tires very slow. Is there any chemical way to remove it without melting the plastic?
1
vote
1answer
72 views

Inflating My Bike Tyres

and just bought a bike and needs to inflate the tyres. I bought a muddyfox trade pump - see attached pics- but still can't fix the air pump head into my wheel. I guess it could be the wrong size or ...
1
vote
1answer
255 views

How to attach mini-pump to valve on kids' bike with no space to manoeuver?

I bought a new, unused mini-pump from Ebay, here: https://bit.ly/2HbbYRW From the enlarged views, you can see that the pump works with both Presta and Schrader valves. For two kid's bikes, I can ...
1
vote
1answer
130 views

How to use a stirrup pump on kids bikes - no space for chuck?

My last bike experience was about 56 years ago. I now want to inflate the tyres of my grandchildren's bikes. I have a steel stirrup pump (floor pump) with presta and schrader orifices in the chuck. I'...
4
votes
8answers
746 views

What makes a good floor pump?

There are so many options, mainly because of the own-brand alternatives. So how do I choose a good floor pump? What should I look for?
1
vote
2answers
255 views

Is there a pump / Schrader valve adapter that prevent leakage during disconnection?

My tyres are rated at 120psi and I like to inflate them close to that. My pump is electric with presure indicator. If I just unscrew the pump and connect it back the pressure drops by about 20psi. I ...
7
votes
1answer
2k views

How does a double-headed bicycle pump work

I have a pump with a presta fitting on one side and a schrader fitting on the other side. If I leave the pump unattached to anything and work the handle, air squirts out both orifices. But if I put my ...
21
votes
1answer
3k views

How does a bicycle pump *head* work?

Asking about the pump heads that are pressed on the valve, not screwed. One has to lift a lever before pumping. After pumping, push the lever down before removing pump head. I would like to understand ...
1
vote
2answers
119 views

Mounting mini-pump on frame

I recently bought a mini-pump from Amazon, it was very cheap and, so-far, I'm pretty impressed with the build quality. I never intended to mount it on the bike but then realised that it came with a ...
1
vote
0answers
101 views

Replacement part for old Schwinn pump

Where can i find a replacement for the metal part (at the end of the 24 inch hose) that clamps around the valve stem, for an old Schwinn floor pump (30 years?)?
0
votes
0answers
48 views

Bicycle Pump: Dual (Schraeder/Presta) automatic valve stuck [duplicate]

I got a pump with an head like this, and I use both the presta and the schraeder opening. The problem is that the automatic switching does not seem to work as well as it once did. It is pretty random ...
4
votes
2answers
5k views

Locking pump dual nozzle on presta valve doesn't work

I have just replaced an inner tube on the front tire, and discovered it had a presta valve. My old floor pump is fitted for a Schrader valve. I learned I could buy an adapter, however, I decided to ...
9
votes
1answer
1k views

How do tire pumps work?

How does a pump push air into the tire and take in air from somewhere else? Why doesn't air spill out from the edges of the hole where the long thing goes in and out of the tube? I'm a complete noob ...
4
votes
1answer
536 views

How do I attach this pump head to my Schrader valve?

I am such an idiot, but I can't figure out how to attach this pump head to my Schrader valve. The lever doesn't seem to flip up??
3
votes
1answer
2k views

Open up blocked Dunlop valves

When I try to pump my bike tires (Dunlop valves), the valves resist letting air in. It's as if I'm trying to pump air through a blocked valve. If I push really hard and I have a lucky day, something ...
9
votes
1answer
3k views

How to disassemble a Topeak JoeBlow Sport II

OK... I searched everywhere, could not find a definitive answer. I've had the pump a few years and use it a lot on several bikes. I like my pump and want it to last as long as possible and I'd ...
7
votes
3answers
1k views

Floor pump blowing wet air?

I have a Lezyne Sports Drive floor pump. It has worked fine for a couple of years, and it lives in my garage. The handle is stored in the down position, so the cylinder is mostly empty. The pump ...
3
votes
2answers
538 views

How to pump this bicycle tire with this pump?

How to pump this bicycle tire with this pump? In general, what are some good material to read to become well knowledgable about bicycle pumps?
2
votes
1answer
5k views

Any fix for a schrader valve that won't open?

I have the all too familiar problem of being unable to pump up my tyre :( It's not a problem with the pump (because it works on the other wheel) so I guess there must be something wrong with the ...
1
vote
5answers
2k views

What's the specific use in carrying a pump?

I've seen people fit tire/tyre pumps to their bikes. What's the use in that? If I have a puncture it's usually a sizable hole in the tube, such as a piece of glass that pierced the tube. I could ...
5
votes
1answer
2k views

How does a double effect pump work?

I have just bought a double effect hand pump (a BETO CLD-024NAG) without knowing what to expect. I was very surprised to discover that the pump inflates the tire both when I push and when I pull. How ...
5
votes
5answers
2k views

How to mount a compact pump onto a full-suspension frame?

Many FS mountain bikes have a weird shaped seat tube. I have managed to strap tube to the bottom of the down tube with electric tape, but am now struggling to purchase and mound a small pump. As is ...
1
vote
0answers
666 views

How to gauge pressure w/ Presta valve and Schrader adapter?

I've bought a floor pump which doesn't have a Presta nozzle, only a Schrader one, and it comes with an Presta to Schrader adapter included. The pump has an integrated gauge, up to 160 psi. My bike, ...
4
votes
1answer
218 views

What valves are these?

What valves are these, and why do each wheel have its own type?
1
vote
0answers
300 views

Joe Blow bike pump failures in one way valve

I used a bunch of Joe Blow bike pumps to pressurize water bottle rockets. Occasionally water squirted back into pump. After a few weeks of use, the one way valve failed. How can I fix this or prevent ...
4
votes
3answers
242 views

How do I know when it's time to pump up my tires?

I've been cycling for several months now. However, I have had the misfortune of having two bicycles stolen from me, so I've never had a single bicycle for more than a few months. With time passing, I'...
0
votes
2answers
344 views

Kenda Kwest 100 psi tires (presta valve)

I am pretty new to bicycles. Got my hands on Kenda Kwest 100 PSI tires with presta valves and I have a couple of questions about inflating them. Using a floor pump, do I need to pump them a bit over ...
3
votes
1answer
138 views

bike pump hose split

My bike pump hose keeps splitting in two halves. First time it split near the base of the pump (which i fixed by discarding the smaller piece and inserting the longer one to the base of the of pump) ...
4
votes
2answers
566 views

Brompton pump mount?

I have recently acquired a Brompton, which came with this zefal pump, which doesn't clip onto the frame: The rear frame on my Brompton doesn't appear to have the cage-like mounts that new models have....
5
votes
2answers
1k views

Is my Schrader valve spoilt?

(Tried searching this forum for this question but I couldn't find a question of the same type) Hello, I've been trying to pump my front tyre but to no avail. I could easily pump the back tyre but not ...
3
votes
1answer
997 views

Bicycle hand pump pressure gauge

Today I got my new bike pump. It is a two-way pump with pressure gauge, up to 100 psi, that I bought cheaply over the internet. When I tried to pump up my tire (Schrader valve) it seemed to be working,...
3
votes
1answer
1k views

Are HV/HP switchable pumps as capable as a specific HP or HV pump?

There are generally two big specialties for pumps. High Pressure (HP) or High Volume (HV). I ride Fat bikes, mountain bikes and road bikes, so I'm confused about buying a new pump to carry while on ...
5
votes
2answers
720 views

Is my pump faulty or my tyre?

I have recently bought a Specialized women's road bike and for the last couple of weeks was borrowing my boyfriend's hand pump with no real issues. Last night I finally purchased my own (Topeak ...
6
votes
3answers
6k views

Is it normal for a presta valve to unscrew into two pieces?

I have a Continental Road inner tube with a threaded presta valve. I also have a threaded bike pump which I screw onto the valve to inflate the tube. When I try to unscrew the pump, the uppermost ...
4
votes
1answer
1k views

Fix a broken floor pump, replace pump head

The little plastic lever to tighten the o-ring broke on my floor pump. It's probably fifteen years old. The model is a Pyramid Pro. The broken bit is highlighted in red. There's nothing else wrong ...
3
votes
1answer
286 views

Is pressure of presta valve hard to read by design?

I have dual system floor pump. When I use it with auto valve it is no brainer to use -- after attaching the pump I get the reading right away, I pump, with each stroke there is small spike in reading, ...
2
votes
2answers
559 views

trouble inflating tires

I've watched several youtube videos on inflating bike tires. i have presta valves on mine. When I the top is screwed completely on it works but i'm told this is just pressurizing the inside of my ...
4
votes
1answer
488 views

Am I unscrewing my pump incorrectly?

I just bought a new mini pump (with a foot-stand and pressure gauge to get up to about 100psi), however, in order to get a good seal you have to screw the pump-head onto the valve. The issue is, ...
0
votes
3answers
533 views

Presta valve pump or presta adapter

I have a bicycle with Presta valves. Should I buy a Presta pump or a Schader pump and a Presta-to-Schader adapter?
-1
votes
4answers
313 views

Does anyone make a push-push on/ pull-pull off bike pump? [closed]

Most current bike pumps require three hands to use - one to hold the tire, one to put the pump head on the valve and one to pull the lever back. 15 years ago, most bike pumps only required two hands ...
6
votes
1answer
27k views

how to use “smart valve” pumps?

i got one floor pump with a so called "smart valve". it came with no instructions whatsoever. and I'm not smart enough to use it... I tried it on both type of tire valves, and no matter what i do, it ...
5
votes
1answer
3k views

What kind of portable pump should I carry when riding on a fat bike?

However, I just got a fat bike with 4.5in tires. I know that my portable hand pump takes a long time to pump mountain bike tires due to it being optimized for high pressure / low volume. What type of ...
3
votes
3answers
24k views

What do I do if my bike won't pump with an air pump at all?

My bike tires will not pump up at all. I tried forever. I had this bike for a year and then it won't pump at all. I have a pump you stand on and use your 2 hands to pump. At first it was pumping air a ...