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Questions tagged [presta]

A style of valve for tire inflation

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2 votes
2 answers
117 views

Tire inflation issue when using a Presta to Shrader adapter

I believe with the top Presta valve pressure release nut it should stay in the upwards position to allow the air chuck to depress the Shrader. After installing the Presta-to-Shrader adapter to the ...
5 votes
2 answers
506 views

valve stem caps on tubeless tires

On my road bicycle with tubed tires ridden only on paved roads, I never used the caps that covered the tube stems. Now that I have switched to road tubeless tires, do I need to use the caps to reduce ...
2 votes
2 answers
463 views

How do I stop a removable valve core from leaking?

This Presta valve core, here removed, has been a nuisance since day one. Once inflated, it holds the pressure well for a trip to the trails, but after 3-4 days, the wheel is flat again. The volume (29&...
4 votes
3 answers
1k views

How does a Presta valve core work?

I would like to understand how Presta valve cores work. A Presta valve core contains all of three screws: the top nut screw (brass part, right side of the image), the valve cap screw (with notches ...
11 votes
3 answers
29k views

what is the ideal presta tube valve stem length

I have noticed that presta tube valve stems come in various lengths. I always assumed the longer valve stems were to allow the use of deeper aero wheels. Why is it that many wheels in print ads seem ...
3 votes
4 answers
939 views

Is it a good idea to use a Presta-to-Schrader adapter and Schrader mini pump if you have bikes with both valve types?

I have bikes with two types of valves: Presta and Schrader. Usually when buying bikes or rims, I'm very careful to buy only Presta stuff. If I for some reason end up with a Schrader rim, I may go even ...
5 votes
2 answers
3k views

broken presta valve confusion

Not a big bike person so my information could be wrong. My bike tire leaks air whenever I fill it and I know its coming out of the valve hole. I did some research and found that its a presta valve so ...
0 votes
0 answers
87 views

New presta valve core leaks

I have tubeless tires with sealant and there was sealant leaking from both presta valves after using a broken bike pump on them. After it it seems like the sealant clogged the valve a little bit and ...
2 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 ...
2 votes
1 answer
2k views

Why did my inner tube suddenly start leaking air?

As the name suggests, my front bike tire's inner tube has suddenly started leaking air for no apparent reason. I used my bike on Sunday on a fairly rough trail, but everything seemed fine afterwards. ...
3 votes
1 answer
144 views

Presta Tube Valve doesn't open when pumping air in

I had my back wheel out during winter because the bike was on the trainer and it of course lost some air. When I put the bike together for outside riding recently, I noticed that I'm having a hard ...
2 votes
2 answers
91 views

Tube failure at base of Pesta valve after tightening nut

I just put an old set of tires and tubes back on the rims, and on one wheel, as I tightening down the Presta retaining nut (the nut that goes onto the valve after it's gone through the rim), I heard a ...
6 votes
5 answers
15k views

How to keep Presta valve core 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 core screws off with the pump attachment and the tire deflates. I tried about 6 times, ...
9 votes
6 answers
2k views

Roadside repair: how to use a screw-on Presta pump on a tube with a removable valve core

I found the question How to keep Presta valve insert from detaching after inflation? but none of the answers are helpful because this happened to me in the middle of a ride on a rental bike. All I ...
10 votes
3 answers
4k 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 ...
5 votes
2 answers
3k views

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 ...
14 votes
8 answers
51k views

Schrader tubes in Presta configured Rims?

My 26" mtb rims support presta sized tube stems, however can I drill the diameter of the holes in the rims bigger in order to support Schrader stemmed tubes? what is the proper way to do this, is ...
3 votes
1 answer
142 views

Should I replace this tube or try to replace the core?

I just borrowed this old bike and realized could not pump up the back wheel. When I saw the valve, it looks like the valve core is missing. I tried to install a new presta core but it did not fit. ...
7 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 ...
3 votes
3 answers
43k views

Presta valve on new tube won't inflate

Just replaced a bad inner tube with a new, Presta valve tube. Unfortunately, I seem to be unable to get any air in the tube; I hear air leaving the pump and not going anywhere. I tried investigating ...
16 votes
10 answers
22k views

Use a lock nut on a presta valve?

I've always used a lock nut with a presta valve, but I know others who don't use it and leave the valve stem to protrude through the rim hole without fastening. What, if any, are the advantages of ...
4 votes
2 answers
965 views

Presta to Schrader valve adapters that don't screw on the valve core

Do any exist? I want to easily use a gas station compressor without worrying about popping my valve core out when I unscrew the adapter after use. No, I don't want to "just use Schrader-valve ...
0 votes
1 answer
3k views

Presta valve letting all the air out when I screw it back in

I'm getting frustrated with my bike's Presta valve. I spent 20 minutes before the air would move into the tube, all undone by screwing the end of the valve back in which temporarily releases air. I ...
0 votes
1 answer
132 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.
8 votes
3 answers
1k views

Putting a Presta stem nut inside the rim?

Has anyone ever heard of this? I'm not sure how it happened, but when I went to replace my tire today, I found that I had two stem lock nuts on my valve. One inside the rim and one in the normal place....
6 votes
3 answers
35k 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 ...
0 votes
3 answers
477 views

What might be causing my inner tubes to get rips behind the valve?

I'm on my third inner tube now and it's always the same problem: an oblong shaped rip on the part right behind the presta valve. I'm at a loss since instead of the valve side, these rips are appearing ...
13 votes
5 answers
15k views

What are the benefits of removable presta valve cores?

Once again, I spent some quality time debugging a slow leak and found out it was a loose valve core. I tightened it with pliers, but it raises the question, is there a situation where it is useful to ...
1 vote
0 answers
245 views

Tube with crooked presta valve won't inflate

I tried to inflate my tire with the presta valve and it won't inflate. As you see in the image, the valve is a bit crooked. After couple of times pumping, it becomes more difficult to continue but ...
2 votes
1 answer
1k views

Presta to Schrader Conversion

I've been procrastinating for several years about converting from Presta to Schrader on my Trek 4200 with Bontrager AT650 (erto 559x19) wheels. What finally convinced me was getting three flats on a ...
2 votes
1 answer
353 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 ...
1 vote
1 answer
5k views

How to repair a twisted Presta valve?

On one of my old bike, I have a twisted Presta valve: Unlike this user, I can't put glue on my valve because the air is leaking at the tip of the valve (where it is twisted). So, I want to know if I ...
3 votes
4 answers
3k views

Can a bike have both Schrader and Presta tires?

I have Kona Dew 2018 and the front tire has a Presta valve while the back tire has a Schrader valve. Is it common to see bikes have different valves for each tire?
2 votes
2 answers
1k views

Presta valve inner tube issue: area around the valve does not fill up

I have this problem I keep running into and it's getting pretty expensive. I've bought many inner tubes and when I pump the tire up with air, the inner tube fills up really good except in the area ...
13 votes
9 answers
260k 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 ...
4 votes
2 answers
1k views

Schrader inner tube gets cut by Presta sized hole in rim

I am new at bikes. I got an old bike with flat tires which I decided to put back to life. I went to Walmart and got the cheapest inner tubes (Goodyear) which turned out to be Schrader type. I had no ...
2 votes
0 answers
540 views

Tube won't inflate or deflate [duplicate]

I have presta valves, and I got tubes with green goo about a year ago. I didn't ride my bike a lot, but I'm riding it more now, but the rear tire can't inflate or deflate. It's full enough that I cant ...
25 votes
8 answers
26k views

Does the plastic cap on a Presta valve serve any purpose once fitted to a rim?

I can see the use of the valve cap on a Presta valve when the tube is still packaged (it obviously stops the valve puncturing the tube), but does it do anything except look pretty (or not) once you've ...
24 votes
7 answers
8k views

Which kind of tube valve is the best?

What kind of valve is the best one, a Presta valve (6mm) or a Schrader valve (8mm). Which has the best reliability, which one is easiest to fix a flat on?
0 votes
0 answers
190 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
2 answers
4k 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 votes
4 answers
39k views

stop air leak when disconnecting inflator from presta valve

Presta novice question. When removing the adaptor and quickly screwing the inside core down, air escapes. I've changed from a short Zefal pump to using a compressor. The tire says 50-60 PSI, but by ...
3 votes
1 answer
200 views

Massive loss of pressure in my front tire but it still holds air

Last night I was riding into a parking garage with a steep decline before the entrance. I hit the bottom of the ramp hard and lost most of the tire pressure in my front tire in a split second. I ...
6 votes
3 answers
20k views

Presta Valve Core bent

Today I was trying to pump my bike tire using mini pump. It has presta valve and after pumping i found that I've bent the valve core by about 5 to 8 degree angle. I tried to bend it back enough for it ...
10 votes
7 answers
18k 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 ...
1 vote
5 answers
9k views

Is there a work around to a presta valve not engaging a tire inflater pin?

I believe that either the schrader adapter I'm using is too long or the pin for the presta core isn't long enough for me to be able to use an air compressor. It works fine with a floor pump since a ...
3 votes
2 answers
58k 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 ...
3 votes
1 answer
1k 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 ...
1 vote
0 answers
2k 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, ...
3 votes
1 answer
12k views

How can I tell if my presta valves have removable cores?

I read about valves that have removable cores and that is better for applying sealant. How can I tell if my valves have cores that are removable? (I don't have the type of the tube, or any other info;...