Questions tagged [pump]

Bicycle pumps pump air into tires and suspension forks.

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59 views

Spin doctor Essentials II pump not working properly

I attach the pump head to the presta valve. It attaches properly and even a few PSI, like about 10 psi, go in and then the pump handle just wants to spring up and is very difficult to push down. I can ...
2
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1answer
110 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 ...
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4answers
265 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 ...
11
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1answer
605 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 ...
5
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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 ...
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7answers
172k views

Can I use a gas station air pump on a bike tire?

Someone pointed out that it may be risky, and it might not have the right kind of nozzle, but I don't have a bike pump at the moment. Does anyone else ever do this?
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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
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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 ...
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5answers
8k views

How can I properly replace the hose on this older Schwinn pump?

I have the following Schwinn bike pump. It’s pretty old, perhaps 30 years or more. I like it a lot. Some years ago, I changed to Presta valves; for this I needed a new head. I got a Topeak SmartHead ...
2
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1answer
74 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 ...
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2answers
108 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 ...
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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 ...
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2answers
103 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 ...
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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 ...
5
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3answers
14k views

Can I use a shock pump to inflate a tube?

I know that shock pumps are meant for high pressure applications so that they can withstand high pressures needed by suspension shocks. However, can I use a shock pump to inflate my tire in a pinch ...
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2answers
366 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. ...
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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 ...
10
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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 ...
3
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2answers
88 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 ...
1
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1answer
399 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 ...
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2answers
1k 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 ...
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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?
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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 (...
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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 ...
3
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1answer
262 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
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1answer
403 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?
6
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1answer
38k 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 ...
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1answer
76 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
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1answer
182 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'...
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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?
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2answers
470 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 ...
12
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9answers
217k views

How to inflate a tire with a Presta valve?

My new bike has these thin tires with a type of valve I haven't usedbefore. I searched online and found out it's called a Presta valve, and it's pretty common and popular. I'm finding it annoying and ...
21
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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 ...
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2answers
137 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 ...
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0answers
177 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?)?
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0answers
68 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 ...
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2answers
2k views

Can I approximate how much air pressure is lost from disconnecting the hose?

I have a floor pump intended for mainly rather low pressure tires. It lets out quite a bit of air from the hose when disconnected. Can I calculate (approximately) how much air pressure is lost by ...
6
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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 ...
8
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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
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1answer
736 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??
5
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2answers
5k views

Pressure gauge on my pump stuck at one value, what is wrong?

I have a Specialized Switch Hitter I have used for several years on both Presta and Schrader valves. Recently, my wife tried to inflate her tubes (Schrader valve) and could not get the pump to ...
4
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3answers
27k 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 ...
2
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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 ...
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7answers
12k views

How to safely remove pump off presta valve?

No matter what I try I can't seem to remove the pump off my threaded presta valve without injuring my hands on my wheel spokes. I'm beginning to think I'm doing something wrong. After unlocking, I ...
2
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2answers
608 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
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2answers
39k views

Cannot fit pump nozzle properly to the presta valve of my tyre

I bought a Reebok Bike pump yesterday which is this one. I have presta valves for my Jamis Allegro Sport 2012 hybrid bike and I was trying to pump the tyres using the pump as part of my monthly ...
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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
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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
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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 ...
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0answers
956 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, ...