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Valves allow air to enter pressurized chambers (such as tires and suspension forks) and remain there. Common bicycle valves include Presta, Schrader, and Woods valves.

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692 views

What air attachment screws onto a Presta valve with the core removed? High volume for seating bead?

I have presta valves on two of my bikes. I have a presta floor pump. I have an air compressor. I have a schrader adapter. I have a blowgun and a tire inflator for my compressor. I can attach the ...
8
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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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2answers
396 views

Can't get bike valve caps off

I will sound a bit thick but i'm no bike mechanic, to give you an idea of what make my bike is here are some pics (the bike isn't mine and the owner doesn't know). the problem is that I cannot get ...
2
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2answers
76 views

Diameter of valve hole in the inner wall of the rim

Let's say I have presta valve, so the outer hole in the rim is 6 mm (the visible hole). However rim can have inner "wall" inside with inner hole in it -- to my surprise the hole has bigger diameter. ...
2
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2answers
177 views

Inner tube valve cut from stretched rim tape?

I was trying to fix my sisters flat tire to make some money by charging her fees cheaper than the bike shop. I found the leak to be on the actual valve piece. Near the base there is a small cut ...
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0answers
62 views

Valve keeps going lop sided

I keep having problem with my bike lately in relation to the rear wheel and the valve which whilst seated properly and straight at first and gives a good smooth ride, sooner or later the valve will ...
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2answers
177 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 ...
2
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2answers
598 views

Presta or shrader valve for mtb?

Is it better to use presta or shrader valve for tubeless conversion on a mtbike, 29" 2.20 tire, and why?
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3answers
138 views

Valve extender snapped off

Yesterday I crashed, and somehow the front wheel landed on a rock or something that made my valve extender break. The bottom part of it is still stuck in the valve it extended. It's a tubular tire so ...
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6answers
228 views

How can I avoid tearing the valve loose from an inner tube with a wheel lock?

The problem It sounds foolish, but I have too often torn the valve loose from the inner tube by rotating the wheel so that the valve is pressed against a closed wheel lock. Wheel locks are common in ...
21
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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 ...
3
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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 ...
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1answer
1k views

Presta Valve Keeps Ripping From Tube

I'm an amateur biker, but regularly bike to work. I've been having a problem with my tubes going flat when the valve tears away from the tube. Here's a (grainy) picture to demonstrate: This is ...
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1answer
2k views

Fixing the valves on tubeless tires broke, what are my options?

I bought a used bike that was set up with tubeless wheels, however both valves are shot what should I do? In general, is there more maintenance involved with the upkeep of tubeless wheels? Because I'...
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2answers
311 views

Compatibility of pressure gauge with valve

I have a tube with schrader valve, for which I want to buy a pressure gauge. Is there a specific type of nozzle for different types of valves? How many types of such nozzles are available for ...
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2answers
4k views

Presta valve in a Schrader rim hole: How to use / do I need a rim hole reducer?

I have a road bike here with 622-16 wheels and Schrader valves. As I needed to replace a tube, I found that most options in the 622-23 size use Presta valves. I read around a bit and found people ...
1
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0answers
511 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, ...
2
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1answer
998 views

Presta Valves keep failing

New to this site. Hope you can Help. I have been commuting on a hybrid for years. A nice CUBE with hybrid tyres with Scrader valve. The odd puncture here and there. Par for the course. Now I have ...
3
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1answer
279 views

Replace Regina valve with Presta

I have recently bought an Italian bike that uses Regina valves and I need to replace one of the inner tubes. Since I don't live in Italy and can't find that kind of valve anywhere, I thought of using ...
5
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3answers
2k views

How tight should your stem valve nut be?

I just got new schrader valve tubes that have the rim fitting nut on them. Since this question has not been asked on here before, what is the proper tension that the nut should meet the rim? My ...
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0answers
62 views

Punctures on outer part on inner tube at valve on both front and rear tyres after 75miles . Signs of abrasion at puncture site.

Just recently changed the wheels on my BMC team machine Slr02 for Campy Zondas also increased the tyre width to 25mm from 23 mm using Michelin Pro 4 endurance . I used Continental inner tubes at ...
5
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1answer
1k views

Can I replace an inner tube with a Dunlop valve with one with a Schrader valve?

I've accidentally bought an inner tube with a Schrader valve for a bicycle that's currently fitted with Dunlop valves. Can I still use it or they require holes in the rim of a different size?
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0answers
114 views

Mongoose Mountain Bike

I have a mongoose mountain bike. Two times I have had the tube replaced because the valve was bent and it did not allow me to put air in my tire. The first time I had it replaced hours later the tire ...
9
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1answer
399 views

Are presta valve cores universal?

Is a Stan's presta valve necessarily compatible with presta valve cores from other manufacturers? Or do they all have different threads?
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4answers
8k views

Bicycle's inner-tube got puncture right next to the valve, How to patch it there?

There is a very small cut 1-2 millimeter or less long in the inner-tube, right next to where it's the bottom of the Schrader valve. The cut is only 1-2 millimeters far away from the valve's bottom. ...
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3answers
4k views

Does the valve have to be straight when replacing a tube?

I've just replaced the tube on my bike and when I pumped it the valve wasn't particularly straight as can be seen in the image below. What I'm wondering is do I need to remove the tube and straighten ...
3
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1answer
2k views

Presta valve top screw missing

I am new to bikes and I realized the back tire valve is missing the top part of the valve , I inflated it but when I unscrew the pump it completely deflates. Can I buy that "screw" or I have to ...
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1answer
318 views

How to use SKS multivalve adapter with dunlop valve?

I have the SKS Rennkompressor with the multi valve head. How do I probably use the head with a dunlop valve? I cannot get the dunlop valve fixed with the multi valve head.
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2answers
1k views

Valve Extender for Kids Bike

I can't seem to fit my bike pump onto my son's bike. The tires are too small, and there isn't enough of a gap to put the head of a bike pump on the valve. Are there any valve extenders (not permanent)...
3
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3answers
2k views

Tubeless conversion on schrader valve rims

Situtation I have an old hardtail collecting dust. I occurred to me that a rigid fork, and some wide (i.e. >50 mm), slick tires would make it a pretty ideal commuter for me. Then I thought it'd be ...
2
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2answers
990 views

Presta vs schrader valves [duplicate]

Are there any advantages of presta inner tube valves over schrader inner tube valves (or vice versa)? Presta schrader I've always wondered why 2 exist. Apart from their radically different design ...
3
votes
1answer
391 views

Do tire / tube / valve combinations that don't leak air exist?

I'm not clear on why tire pressure decreases over time. I understand that air escapes through the tube. Possibly some leaks through the valve too? In any case, do tire / tube / valve combinations ...
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1answer
76 views

How to select a tube?

Hi I got a used bike and my experience with bikes is very limited. The tires and tubes are all broken so I need to get new ones. I found these tires: http://www.fahrrad.de/continental-speed-king-set-...
3
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1answer
552 views

Do I Install Tape or Valve First on a Tubeless Rim

I've just unpacked a tubeless wheelset and I'm installing tape and the valve. Which goes first? The tape or the valve? My wheelset is the DT|Swiss Tricon R 1700. And the manual says: "Mount the DT ...
2
votes
2answers
919 views

Bike Floor Pump for Raleigh Talus 3.0

I'm trying to find a good floor pump for my Raleigh Talus 3.0 bike which I recently purchased. I don't know much about bikes and have seen that there are different valve types (i.e. - Presta and ...
11
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2answers
2k views

What type is my bike valve, and why can't I pump it up?

so I've taken some pictures of the valve on my bike tyre (if you zoom out they look clearer...), below. Basically, it's a new bike and I have no experience around these things. The pump I have doesn't ...
0
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1answer
216 views

What kind of pump/attachment do I need for this? (picture)

I am having trouble identifying what tools I need to pump these tires. We bought some kind of kit that came with multiple attachments and none of them worked. Wondering if something is missing? All ...
2
votes
1answer
4k views

Does valve stem diameter matter for my rims?

Got an old bike that I restored some time ago, and the original tubes literately burst on me today (I knew I should have replaced them long ago, they are probably 10 years old) and now I have some ...
4
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3answers
3k views

Leaking Slime inner tube valve after opened for first time since install

I put some extra air in my rear mountain bike tyre yesterday. It uses the SLIME inner tube. It wasn't flat nor had a puncture, I was just topping it up to make the tyre a bit harder. I cycled to work ...
4
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1answer
494 views

How to safely remove pump chuck from Schrader valve

I just pumped up my tire, and then ripped off the valve when trying to take the chuck off, and consequently the air. I've learned that I shouldn't twist when trying to remove the chuck, but what else ...
2
votes
2answers
31k 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 ...
8
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2answers
3k views

Why do shock pumps use a Schrader valve?

After reading this question and answer, I was surprised to learn that most shock pumps use a Schrader valve. My mountain biking days are a distant memory, so I'm not well acquainted with the type of ...
11
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9answers
200k 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 ...
2
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2answers
666 views

Bicycle with 1 tire with Presta valve and 1 with Schrader valve

One simple question: I have a mountain bike that has 2 tires with schrader valves. I bought a new tube with a presta valve by mistake. Do you see any issues with replacing one of the tubes that had a ...
1
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2answers
6k views

What kind of pump do I need for this valve?

This is the valve I have on my bike, but my current pump does not work with it. What kind of pump do I need to buy that will work with it?
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4answers
4k views

Does a typical floor pump have an integrated one-way valve?

In order for a floor pump to work correctly, something has to make sure that when we pull the pump piston up, the air from the tire does not escape back into the pump. For that there should be a one-...
3
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2answers
8k views

unblock slime presta valve

My Son's bike has slime inner tubes. The bike has been sitting in the garage since last summer and the front tyres valve now seems blocked. Its has what feels like 15-20 psi in it but I can not get ...
2
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1answer
1k views

Is my valve faulty?

I'm not sure how to describe this problem. I'm fixing a puncture on my bike which is a road bike that requires pumping up to about 90psi. So I fix the puncture, and I pump it up. At first it's okay, ...
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8answers
24k views

Why are both Schrader and Presta valves still used on tubes?

It is standard for road bikes to adopt Presta, whereas nearly all else use Schrader. I personally think Schrader are better: I've had fewer Schrader valves break on me than Presta No problems if ...
1
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1answer
743 views

What's the longer-valve, metal-ring inner tube style called?

I have an innertube for a Chariot stroller that apparently came from Europe, and the local bike shop people couldn't find one in their catalogs that was both the right size and having the thing I'm ...