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.
I got this 21 speed mongeese from a friend of mine that tire that shaky tried everything I know and it's still shakey what do I do I will put a pic on it and the second... Read more >>
How should I store the spare tube/patch kit/tools for my bike in case I get a flat while riding? A backpack won't work as it is too heavy and inconvenient. I was thinking about making a small bag to attach to the frame to store the tube/kit and wrench in, but I think it may mess with the way the frame pump mounts to the frame.
BTW, should I take a spare tube or a patch kit? I understand there are some times where a spare tube is the only way (i.e. blowout, giant rip in the tube, or the valve stem comes off) but a wrench (needed to take the rim off the bike) adds weight (although t... Read more >>
I ride a hybrid with 700x38c tires . After getting a few thousand miles from the original tires , the rear one was getting very worn so I decided to replace it .
Ordered a replacement from Amazon a few weeks ago , but instead of sending a 700x38c , they sent me a 700x35c . Wanting to keep the front and rear tires the same size , I returned the 35c and again ordered a 38c . Today , the new tire arrived and again they sent me a 700x35c !!!!!!!
My questions are .... (1) will the 35c fit properly on the original rim that came supplied with the 700x38c tire and .... (2) ... Read more >>
I want to create a "tire-repair kit" for next summer. I'd like to ride on the Katy (MKT) trail that runs through town but I don't want to have a repeat of what happened a couple summers ago, so I'd like to create a tire-repair kit.
A couple summers ago I was riding along on the trail, and was a good ten miles from home, when I heard a "psst..." coming out of my rear tire. Within about 30 seconds the tire was completely flat. It was pretty late at that point in the summer day (6:30 or so) so I had to ride my bike on the rocky terrain, on a flat tire, about 10 miles back home. (I di... Read more >>
Before I continue I must clear this topic up by saying that I'm only posting this for curiosity sake. I'll admit it... they're really dumb questions, but I had to ask them:
My first question is: would it be okay to temporarily run 26x1.95 inner tubes in a 27x1 1/4 tire at low pressures? My concern would be that the expanding tube would "force" the tire right off the rim, but am I right?
My second (and more "intelligent") question is: if you don't have a tire (but need to use your bike), could you inflate the tube (enough to give it shape), wrap the tube duct-tape to h... Read more >>
I'm plagued at the moment by tubes which keep bursting on the side closest to the rim. There doesn't seem to be anything obvious which is doing this such as spoke heads sticking out through rim tape, grit, thorns or other stuff stuck to the rim. I inflate tubes to the max recommended pressure (65 psi) and this hasn't happened too often before, so the chances are that the tubes are bad quality (even though they are weighty and not cheap).
I've found that patching holes on the inner side of a tube doesn't work too often because the tube has to stretch and deform as it pushes into t... Read more >>
I understand cheaper regular tyres are made with a steel wire bead. But are all folding tyres made of Kevlar bead? I have just purchased a set of tyres as per attached photo and wanted to know if the bead is Kevlar. Can anybody please help?
Thanks... Read more >>
Earlier this year I replaced tires on both vintage bikes, due to dry rot... Age (30+ Years).....
I didn't think anything about the procedure, and did the following on first time inflation (I have an air compressor in garage):
Put about 20 Pounds of air in, then bleed it out.... Then do 30, and bleed...
Then 45, and bleed...... then went to 70....
I used to do the same (at lower pressures) for motorcycles.. I was told this prevents the inner tube from twisting and pinching in the tires.
Is this acceptable for bicycles, too? Or is ther... Read more >>
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 >>