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38
votes
11answers
43k 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 ...
22
votes
8answers
12k 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 ...
18
votes
7answers
3k 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?
16
votes
4answers
13k 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 ...
12
votes
8answers
5k 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 ...
11
votes
7answers
128k 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 ...
9
votes
1answer
140 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?
8
votes
6answers
6k 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 ...
8
votes
2answers
88 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 ...
7
votes
5answers
10k 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 ...
7
votes
3answers
3k 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 ...
7
votes
3answers
12k 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 ...
6
votes
4answers
285 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 ...
5
votes
3answers
664 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 ...
4
votes
2answers
5k 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 ...
4
votes
1answer
166 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, ...
3
votes
3answers
2k 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 ...
3
votes
3answers
121 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 ...
3
votes
1answer
89 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, ...
3
votes
1answer
345 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 ...
3
votes
1answer
376 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. ...
2
votes
2answers
863 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 ...
2
votes
2answers
13k 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 ...
2
votes
2answers
565 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
vote
4answers
593 views

New pump - Topeak |Pocket Shock

I bought this new pump, but i think I made a mistake. I need it for my road bikes, with presta valves. I don't understand how I connect the pump to the presta. Is it even possible? do I need an ...
1
vote
1answer
28 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 ...
1
vote
1answer
111 views

phantom leak that fixed itself?

I recently replaced my front tire. About 3 days post replacement I noticed that the pressure in that tire was at about 50psi (Its a road bike - I keep it around 120). I pumped it up and hoped for the ...
0
votes
3answers
86 views

Presta valve pump or presta adapter

I have a bicycle with Presta valves. Should I buy a Presta pump or a Schader pump and a Presta-to-Schader adapter?
0
votes
2answers
420 views

How can I inflate Presta valve tires using a Presta compatible pump without bending the valve stem?

After my $20 floor pump from the hardware store gave out. I bought a rather more expensive one rated to 160 PSI. The pump has a metal nozzle on it, with a Schrader opening on one end and a Presta ...