28. How to Use a Presta Valve Adapter
Learn how to use a presta valve adapter to inflate your tire using a regular air pump.
The two most common valve types these days are Presta valves and Schrader valves. Schrader valves are most commonly found on bikes with wide rims and are the same style you’ll find on most automobiles. They use an internal spring to allow inflation while keeping the valve closed. You can inflate this style easily with any regular air pump.
Presta valves are a lot narrower and are commonly found on higher end bikes with narrow rims. They are a little trickier to inflate as they use a manual locknut to open the valve for inflation. To inflate a Presta valve you’ll need a regular air pump and a special adapter. These can be purchased for about a dollar at your local bike shop. In this tutorial, we’ll learn how to use the adapter to inflate your tire.
The first step is to remove the cap and then loosen the valve’s locknut all the way counter-clockwise. Notice that you can now let air out by depressing the locknut.
Now install the adapter by carefully threading it clockwise onto the valve stem’s threads. The adapter effectively converts your Presta valve to a Schrader valve so that you can use a traditional air pump to inflate it. Attach your air pump and inflate the tire to the recommended pressure. This is written on your sidewall and is usually marked with a ‘PSI’ rating (pounds per square inch).
Once the tire is fully inflated, remove the air pump, remove the adapter, and finger tighten the locknut. Then replace the cap. There is another locknut at the bottom of the valve stem. This should be finger-tightened once the tire is inflated.
My rear tire went flat overnight and when I inflated it in the morning, a bulge formed (see photos). I removed the tire and found a slightly worn spot about the size of a dime on the inside of the tire where the bulge was. I couldn't find any debris in the tire. The tube itself is not worn in that spot.
I remounted the tire twice and the bulge formed in the same place each time. I tried inserting a folded dollar bill, but it didn't help.
The tire is about 2 years old, but hasn't had much use (just occasional city riding). The tube is about a week old.
Ha... Read more >>
Noticed this today... trying to figure out what I ran over to do this?
Can I still ride?...
Anything to do to repair?...
or is it replacement time?
Thanks!... Read more >>
The current Continental tire and tube chart has two columns designated ca. and PU. What do these designations mean?... Read more >>
Please forgive me if this has been covered somewhere on this site, if it has, I can't find it.
I have 26 x 1.50 rims with 26 x 1.75 tires
needed two new inner tubes.
The bike shop sells me a 26 x 1.50/1.75 with Schrader valve and a 26 x 1.9/2.125 also with Schrader valve.
They didn't have anymore of the 1.50/1.75 with Schrader valve and said the 1.9/2.125 would fit especially since it's a mountain/city bike.
The problem is that the 26 x 1.9/2.2.125 is too "big" for the wheel.
The width seems OK but when I put the tube on the rim t... Read more >>
Firstly, you are dealing with a dummy here. OK? I have just started cycling again and have 700c x 45 tyres. I'm doing distance charity rides and I'm getting conflicting advice. Some say yes, 45 is fine, a good comfortable ride. Others say, you must be crazy cycling with tyres that wide. They say that the drag, especially on hills, will kill me! Who's right please? Wide or narrow, that is the question?
Supplementary question. If the view is go narrow, do I need new wheels or a new bike? Money is definitely an issue here. I'm not in the big, or even large, budget range.
Thanks[/size&... Read more >>
I recently bought a road bike, and on my first ride, the tube on my rear wheel unfortunately got punctured. I used a cement patch kit and the tube seems to inflate well, but whenever i put it back in the wheel and start riding, the tire goes flat again. I'll take the tube out of the wheel again, but the tube seems to work perfectly. Also, when I do inflate the tire and spin the wheel, it is a bit uneven, not side to side, but up and down. My rim and tire seem perfectly fine though. Any suggestions on how to fix the problem, or what's wrong?
Thanks!... Read more >>
I've got an old road bike with 27" wheels and 27 1 1/4 (32 x 630) tyres. I just ordered some spare inner tubes online and found out that 700 28-35c should be appropriate for my bike. They have sent me 700 25-28c tubes instead though, claiming that they should still fit, as they cover all tyres from 25-38c (instead of 28, as it says on the label), which is a much broader range than the one they'd originally listed.
I've been trying to find out for quite some time now if these tubes should indeed be fine, so if anyone here has any idea about their suitability that w... Read more >>
This post may not be clear without pictures, but I'll continue...
Today I rode my bike and my valve stem on my rear tire was crooked. I went to a local gas station that has a free air compressor. I tried to move the tire back into position so the stem would be straight. No go.
I ended up taking the tire off and the tube out and putting the tube back in and re-mounting the tire. When I inflate the tube, I noticed little "cracks" in t... Read more >>
Went tubeless on the Lefty last night. seems to be working and holding air but I have a slight wobble that I don't think was there before. Should I let the air out and try to reseat the tire or what. Seems to be seated ok.
Bill... Read more >>
I'm having trouble inflating the tire on my Dutch bike (I now live in the UK, no longer NL, by the way). It's got what I'm pretty sure is a spring-loaded or one-way Dunlop valve. As you can imagine since the valve is on my desk, the tube is now deflated.
The problem, I think, is that I can't get the valve to open. I'm using a reasonably potent two-cylinder pedal pump, but I can't seem to force air through the valve. When everything is seated properly to pump the tire, if I contort myself to hold the nozzle of the pump as tightly against the adap... Read more >>
While removing the pump head after pumping, the presta valve got broken. I then reinserted the pump to check whether it can sill be pumped, and all of a sudden the remaining needle is lost ( might have gone inside the tube). Is there any way to fix it without changing the whole tube?
And if I need to change the tube, then what would be the tube size? My bike is Giant OCR3 2009 model.
... Read more >>
When I was younger, I only had a bike till I was25. I am trying to get back into biking again. I bought a vilano performance hybrid roadbike and it came with 700 x 28c tires with presta valves. Now, its been a long time, but what was wrong with schreider valves ? Anyway, I know tubes loose air pressure over time, but I only rode the bike In the parking lot once to see how the adjustments were, one week later, I went to ride the bike, and both tires were completely empty, I pumped them back up to 85 psi, and a week later they were completely empty, I tightened the nuts after and rep... Read more >>
Hi all. I have a 1993 Nishiki Modulus I use to commute to university classes, except right now I have a flat in the back tire. The tube on the back tire says its size is 27"x1" 90-110 psi, but all the tubes I can find online are x1 1/8" or x1 1/4". Am I missing something about road bike widths here? Will that extra eighth or quarter of an inch mean the tube won't fit, or can I get by with it? If not, where can I find a tube to fit my rim?
Apologies if this question has been answered previously, I only had a quick look around before I asked.
D... Read more >>
When I change the tube on my bike (it's s Dawes Super Galaxy). When. I pump up the tube it pushes the tyre out of the rim. Happened 4-5 times yesterday. Lost a brand new tube.
Does this mean the tyre is knackered?
Thanks in advance.... Read more >>
I have a Specialized Rockhopper with Maxxis High Roller 26x2.35 tyres. I've only just noticed lots of short diagonal splits (almost like knife nicks) on the rear tyre. They seem to be in line wth constructional lines within the tyre. I know I've done some riding with the tyre slightly under-inflated but is there any connection ?. Has anyone experienced similar wear and do you think its safe to ride on ?..Many thanks for any replies... Read more >>