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Questions tagged [presta]

A style of valve for tire inflation

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50 votes
11 answers
116k views

Can I use a Presta tube in a Schrader rim?

I keep losing pressure in my tires, and among other things, I'm looking at the valves in the tubes. It's an old mountain bike with 26 inch tires. Can I use Presta tubes on rims drilled for Schrader ...
Brock Boland's user avatar
  • 1,119
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 ...
Will's user avatar
  • 1,075
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?
Johan Dahlin's user avatar
  • 2,908
23 votes
4 answers
72k views

Should inner tube have excess length?

I've recently changed the default 700x35 tires and 35mm Schrader inner tube to 700x25 slicks with 25mm Presta inner tubes. However whilst fitting the new tire and inner tube, I noticed that the inner ...
Peter Bridger's user avatar
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 ...
Phillip Ngan's user avatar
14 votes
8 answers
52k 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 ...
sov's user avatar
  • 333
14 votes
2 answers
2k views

What might cause an inner tube to "behave" flat in a tire?

I've been having a problem with a "flat" tire - I cannot get the air pressure over 5-10 psi (35–70 kPa), I can hear air whistling out if I pump more in. Disassembled, the tube inflates up to ...
Jon Bon's user avatar
  • 203
13 votes
9 answers
261k 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 ...
wim's user avatar
  • 516
12 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 ...
ojs's user avatar
  • 22.2k
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 ...
mikes's user avatar
  • 18.8k
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 ...
ashley's user avatar
  • 223
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 ...
Aubrey Robertson's user avatar
10 votes
1 answer
1k 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?
Ne Mo's user avatar
  • 1,405
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 ...
DavidW's user avatar
  • 5,202
8 votes
3 answers
16k views

Could I be pumping up my tyres the wrong way?

I now have my first road bike. When I am pumping up the tyres with what seems like a sturdy pump (that you stand on and push with two hands), I can barely get to around 100 psi, even putting my back ...
User 17670's user avatar
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....
ss ulrey's user avatar
  • 181
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 ...
MaplePanda's user avatar
  • 16.3k
7 votes
3 answers
4k views

Why does my floor pump only fill a presta valve tire after a pop sound?

I have had a generic floor pump from an online bike catalog company for years, and have filled many Schrader valve tires with it without any problems. I have recently started to use Presta valve ...
WireGuy's user avatar
  • 607
6 votes
4 answers
364 views

Why does my road bike come with only one valve adapter?

My front tire has the skinny valve (I believe it is a Presta) and so does my rear tire. But my rear tire also has a screw-on piece that goes over the valve which I believe to be an adapter. Do they ...
Joe Phillips's user avatar
  • 1,337
6 votes
3 answers
21k 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 ...
Nevsky's user avatar
  • 115
6 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 ...
Will Vousden's user avatar
  • 4,021
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 ...
marinonifav's user avatar
6 votes
5 answers
16k 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, ...
WilliamKF's user avatar
  • 247
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 ...
J. Bruce Craig's user avatar
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 ...
Pete's user avatar
  • 51
5 votes
2 answers
524 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 ...
pisapete's user avatar
4 votes
3 answers
5k views

Air compressor to fill up to 60 PSI

I am looking for an air compressor and wish to get one which is not under or over powered. I am looking at one in a catalogue which has the following attributes: 40 Litres/min free air delivery 1hp ...
Valamas's user avatar
  • 855
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 ...
Sam7919's user avatar
  • 9,514
4 votes
2 answers
1k 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 ...
Gregory Leo's user avatar
  • 1,305
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 ...
sprogissd's user avatar
  • 141
4 votes
1 answer
205 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 ...
gyoung1986's user avatar
4 votes
1 answer
7k 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 ...
user29768's user avatar
  • 143
4 votes
1 answer
5k views

Am I unscrewing my pump incorrectly?

I just bought a new mini pump (with a foot-stand and pressure gauge to get up to about 100psi), however, in order to get a good seal you have to screw the pump-head onto the valve. The issue is, ...
Chou_Velo's user avatar
4 votes
1 answer
6k views

Why so much hate for presta valve caps? [duplicate]

I first remember hearing hate for presta valve caps in the video where Lance Armstrong changes a bike tire. He says: See that little black thing? Don't put that back on when you're done... ever. ...
Sponge Bob's user avatar
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?
Sarvesh's user avatar
  • 141
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 ...
JBeurer's user avatar
  • 173
3 votes
2 answers
59k 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 ...
ha9u63a7's user avatar
  • 436
3 votes
4 answers
1k 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 ...
juhist's user avatar
  • 20.1k
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;...
user12363's user avatar
  • 157
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 ...
A.H.'s user avatar
  • 31
3 votes
1 answer
692 views

Is pressure of presta valve hard to read by design?

I have dual system floor pump. When I use it with auto valve it is no brainer to use -- after attaching the pump I get the reading right away, I pump, with each stroke there is small spike in reading, ...
greenoldman's user avatar
  • 2,064
3 votes
1 answer
146 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. ...
Teewip's user avatar
  • 33
3 votes
1 answer
151 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 ...
DoNuT's user avatar
  • 4,536
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 ...
RelaxedArcher's user avatar
2 votes
1 answer
355 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 ...
GrixM's user avatar
  • 137
2 votes
2 answers
845 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 ...
Artur's user avatar
  • 21
2 votes
2 answers
479 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&...
Sam7919's user avatar
  • 9,514
2 votes
2 answers
99 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 ...
SSilk's user avatar
  • 4,249
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 ...
Koenig Lear's user avatar
2 votes
2 answers
121 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 ...
JD Douglas's user avatar