Questions tagged [pump]

Bicycle pumps pump air into tires and suspension forks.

Filter by
Sorted by
Tagged with
2
votes
1answer
101 views

What is this valve and how do I fill it?

This is the valve in one of the tubes on my bike: What kind of valve is this, and how do I fill it? I originally thought it was a Presta valve, but it doesn't look or work like any of the presta ...
11
votes
1answer
601 views

Using a schrader pump on a presta valve

I have a JoeBlow Sport (not a Sport II or Sport III) It head defaults to schrader style. There was an adaptor in the box which I thought was a presta adaptor. I tried sticking that adaptor in the ...
1
vote
1answer
72 views

Pump defective?

When I started pumping a new Pumpico floor pump, the shaft slid down doing nothing for about 12 pumps and then kicked in for 2 hard pumps before it did nothing again for another 10 pumps. It's a ...
2
votes
1answer
70 views

Fill my Fox Shock with Air

When I go over a sidewalk, the marker ring on my shock goes all the way down the shock, so I think I need air. I bought a Giant "shock pump" that supposedly goes up to 400 psi. I screwed it onto my ...
1
vote
2answers
102 views

Bike pump issues

I got a Diamondback Viper for Christmas. The tires got a bit deflated so I got a $5 bike pump and I attempted to pump up the tires. All went well for a couple of seconds then all the air from the tube ...
0
votes
1answer
76 views

Comparing mini pumps - what to look for and what to consider? [closed]

I plan to buy a mini pump to take on road rides. My bike has 700 x 25c tires. There are many different models from each, some with thumb lock levers and some with a hose and screw-in lock. What ...
1
vote
2answers
102 views

I can't inflate tire. Should I look for another pump?

Hello to everyone in the community. I used to own a mountain bike which used 26" tires and I was able to inflate them after changing the tube while on the road. It wasn't perfect but allowed me to ...
1
vote
1answer
56 views

Bicycle pump slips after using gear oil

My pump got little rusty from rain. So i tried gear oil on it. But now its not pumping, just sliping all the way down. Is it because of oil or the valve is damaged? I tried removing the oil with ...
2
votes
2answers
311 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
86 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
989 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
86 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 (...
5
votes
4answers
256 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
255 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
395 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
75 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
392 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
175 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
759 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
445 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
3k 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
4k 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
133 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
174 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
67 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 ...
3
votes
2answers
9k 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 ...
8
votes
1answer
2k 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 ...
3
votes
1answer
714 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??
2
votes
1answer
4k 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 ...
10
votes
1answer
5k 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 ...
6
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 ...
2
votes
2answers
601 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
3answers
6k 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 ...
6
votes
1answer
3k 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
939 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
222 views

What valves are these?

What valves are these, and why do each wheel have its own type?
1
vote
0answers
442 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 ...
3
votes
3answers
305 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
432 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 ...
2
votes
1answer
215 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) ...
3
votes
2answers
640 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....
6
votes
2answers
2k 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
1k 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
2k 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
3answers
1k 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 ...
7
votes
3answers
9k 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 ...