Questions tagged [pump]

Bicycle pumps pump air into tires and suspension forks.

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3 votes
2 answers
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How to prevent a Presta valve core from unscrewing when disconnecting a pump [duplicate]

My mini-pump has a screw-on head (as I guess most of them do) and several times when removing the pump from the valve, it's taken the valve core out with it. The last time this happened to me on the ...
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2 votes
1 answer
117 views

Dunlop valve core comes off with the cap

Could someone please enlighten me if my valve is broken? I think this is a Dunlop valve but the core seems completely stuck to the cap. No matter how much I twist and turn the core always comes off ...
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6 votes
3 answers
939 views

What is the difference between hand pumps for road bikes and mountain bikes?

I realise that hand pumps seem to be road or MTB specific, but what is the difference between these pumps? I am looking for one to pump up my road and my mountain bike.
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3 votes
2 answers
115 views

Is it risky to often use an air compressor because of potential for valve damage?

I always use a bicycle shop's air pump about once a week because it is free and convenient however about a month ago when filling in I found that valve was leaking. I went in got it fixed- quick cheap ...
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3 votes
1 answer
80 views

repairing Meidai Top pump?

I've got a very old MeiDai Top floor pump, like this picture ... It suddenly stopped working, no resistance whatsoever from the plunger. I'd like to repair it. So far, I bought this "741" ...
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6 votes
5 answers
2k views

Considering modern bicycle trends (2021), why are presta valves still the dominant design?

The usual trope justifying the use of Presta valves over Schrader valves is no longer logical (in my opinion at least) because of changes in wheel, rim, and tire systems. Let me exemplify by refuting ...
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4 votes
4 answers
894 views

"Soft" valve insert for easier pumping

I've just bought my first bike in 20 years - a 29" mountain bike. And, inevitably, I've just got my first puncture in 20 years, and a lot has changed. The first thing I noticed is that today's ...
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7 votes
1 answer
362 views

How do I take apart a modern Silca Impero frame pump?

I have a new frame pump and I want to take it apart. All the way - down to the metal tubes. This is the top of the air chamber and I don't know how to proceed. There is no trim piece covering this and ...
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  • 123
28 votes
5 answers
8k views

Why do we need air-filled tires?

Why do we need air in bike tires? Having changed hundreds of annoying flats, carried a change kit for thousands of miles, and pumped up tires before pretty much every ride, I got to wondering: why do ...
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  • 411
4 votes
2 answers
233 views

Tires not holding air at high pressure

I ride a Trek road bike with 25c tires. The recommended pressure on the tire is 100-130 psi. Before I ride I inflate the tires to close to the max pressure no problem and my pump works fine. But ...
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0 votes
0 answers
81 views

Help identify mystery part?

This piece came with a CCM tire pump and I have no idea what it is or what it’s for. Can anyone tell me? Thanks.
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3 votes
1 answer
381 views

How often should air spring forks be reinflated (topped up)?

Forks that use an air spring, as opposed to a coil spring, have to be pumped up to the desired pressure to work as intended (using a shock pump). From experience, I know that they lose pressure over ...
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  • 656
0 votes
2 answers
2k views

How to stop air leak when disconnecting inflator from Schrader valve?

People say that the pin must be pressed down in order for the air to get in. But when I try to remove the pump head by unlocking the lever, too much air leaks before I get to remove the pump.
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1 vote
2 answers
686 views

What maintenance should be done on a bike pump to keep it in good condition?

My zefal hp x 4 full frame bike pump internals have rusted out. I now have a Lezyne mini pump. What maintenance should I do on the pump to make sure it does not rust out?
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0 votes
1 answer
107 views

What is the best way to attach a Presta Valve?

I attached a public bike station's Presta valve today - lost all the air in my tyre in the process and it got completely deflated.
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2 votes
0 answers
184 views

What bike Pump can I use for the Peugeot Savoie?

I'm trying to find a hand pump that will fit the top tube of the frame, In the model manual attached is the Bike pump that says 'Zefal Competition HP pump' however could i use a standard 'Frame Pump' ...
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2 votes
1 answer
3k views

Why does bicycle floor pump not show pressure reading?

I bought a new floor pump and it pumps everything perfectly fine, the problem I have is that it only shows a pressure reading while I am pumping and the moment I stop, the gauge drops back down to ...
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8 votes
3 answers
1k views

Will this electric air pump suit my tires and work for me?

I have to buy air pump for bicycle, I saw this one online on Walmart. My bicycle tires have a pressure range between 30 and 50 psi. Will this pump work, or should I buy mechanical one? What are it's ...
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0 votes
2 answers
398 views

Why does front wheel keep more air pressure then rear wheel over time? [duplicate]

After pumping both the tires equally, after a few weeks pass, the rear tire of my bicycle keeps on getting flatter day by day, and looses pressure. I have checked everything and there is no leakage ...
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4 votes
2 answers
421 views

Bike tires only inflate up to 30psi with foot pump

My bike has sat over the winter, and the tires went flat. I used my foot pump to inflate the tires (front and back) and both tires inflated to 30 psi. I have shraeder valves. The pump continued to ...
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  • 41
1 vote
0 answers
423 views

Can't push down bike pump

I have Bell air glide 950 pump. I can't push down as the air is being blocked somewhere. I removed the tube/pipe that connects to the Schrader/Pestra valves. If I open the screw behind the pump, air ...
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  • 11
0 votes
2 answers
192 views

Can't inflate my bike tires

Received an old bike from a family member and I've tried to inflate the tires but whenever I attach the pump to the tire it seems that I can't inflate it. All I hear is a hissing and it feels like all ...
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2 votes
1 answer
82 views

Can pumps fail due to age?

I have a small cache of the now-discontinued Quickex Quicker Pro mini pumps. They have 105 cm3 stroke volume, and 5 kgf force required for 7 bar pressure. In about 100 strokes, I reach 7 bar on 28mm ...
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2 votes
1 answer
112 views

Not able to inflate my bike tyre

I have a Norco Mountaineer SL. It has a schrader valve and I am trying to inflate the tyres using https://www.amazon.ca/Crank-Brothers-16304-Sapphire-Silver/dp/B07K4PLWKW/ I seem to have set it up ...
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4 votes
4 answers
20k views

The pump needle broke off, leaving the base in the nozzle. How to remove the stuck base?

I was using this bicycle pump to inflate a ball. I inserted a needle pin to the nozzle, but the needle broke off after trying to insert it into the ball. The base of the needle pin is now stuck in the ...
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1 vote
1 answer
81 views

How do I inflate this bicycle tire valve? [duplicate]

I inherited this bike with this funny looking stem. Is this broken? How do I inflate it?
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4 votes
2 answers
630 views

What is the typical structure and location of a check valve in a floor pump?

I decided to take apart a Bontrager reCharger floor pump recently on a whim, one of those whims during which you pay no attention at all to what you're doing. After putting it back together, the pump ...
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2 votes
3 answers
993 views

Usefulness of high-pressure/high-volume switch on a track pump

Among the track pumps (floor pumps) on the market, I see one advertised with the following feature: foot-activated high-pressure/high-volume switch I'm interpreting this to mean that the pump has ...
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  • 4,841
1 vote
5 answers
5k views

How to keep Presta valve insert from detaching after inflation?

I have Presta valves on my bike tires and for the rear tire, each time I inflate the valve, upon detachment, the insert screws off with the pump attachment and the tire deflates. I tried about 6 ...
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  • 197
0 votes
0 answers
173 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 ...
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2 votes
1 answer
260 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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  • 125
11 votes
1 answer
1k 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 ...
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  • 390
1 vote
1 answer
104 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 ...
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2 votes
1 answer
682 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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1 vote
2 answers
215 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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0 votes
1 answer
93 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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1 vote
2 answers
304 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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1 vote
1 answer
150 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 ...
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2 votes
2 answers
2k 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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5 votes
3 answers
1k views

Pump head suitable for 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 ...
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0 votes
2 answers
3k 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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1 vote
3 answers
106 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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8 votes
2 answers
4k 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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  • 262
6 votes
4 answers
773 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 ...
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  • 193
5 votes
2 answers
588 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. Does anyone know the sizes? I ask ...
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  • 1,325
6 votes
1 answer
873 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?
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  • 1,703
1 vote
1 answer
109 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 ...
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1 vote
1 answer
719 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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1 vote
1 answer
361 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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4 votes
8 answers
782 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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