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 have a mountain bike with Mavic tubeless ready wheels. I went to change the tires and the front wheel is leaking air from the stem (see pics). A bike repair guy told me to replace the stem but it still leaks in the same spot. I cleaned the old sealant from around the stem. I shook the tire to encourage the sealant to plug the leaks and it just came oozing out. I waited overnight to see if maybe the sealant just needed some time to take hold.. still leaking.
Any ideas of what I can do to fix it?
Imgur album... Read more >>
Can someone tell me the difference between 700 x 23c slick and semi-slick tyres? I see some racing bikes with small tread and I see some with no tread at all.
Thank you... Read more >>
I have just fitted a 700 x 23c tyre to a rather wide rim with an inner width of 18mm. Can anyone tell me the possible issues I may encounter with such a combination?
Thank you... Read more >>
Hi all, long time.
I know there's a few threads about where to get best tire buys online, but I am wondering what anyone is using recently. I'd like to stay away from Amazon, preferably a place that takes PayPal. The tires I'm looking for are old style Schwinn sized, 27" 1-1/8, I think. Thanks in advance.
Steve... Read more >>
Recently I have been looking for a narrower ETRTO 590 tire. In the USA, I wasn't able to find anything except 37/38 wide. I wanted something a bit narrower, and still have relatively high pressure capability. I have been using 90 psi Kenda 37-590 tires.
I ordered Schwalbe 25-590 wheel chair tire and tube - a bit skinnier than what I want, and 85 psi MIN, 145 psi MAX. I may still try it out on the front of my Miyata 310.
More recently, I found that in Europe, Schwalbe offers a 28/32-590 rated at 85 psi - just what I was looking for. Schwalbe USA said "...we don’t m... Read more >>
I learned a lesson today about tires. I went to get road tires for my Trek 831 MT Track.
You cannot just take a 26x2.10 tire and swap it for a
26x13/8 tire. The inside diameter is about a inch different. Is there a simple answer to this? or do I need to alter my plan.... Read more >>
I have a mountain bike - 26" and the tires are 1.95
I also have a cruiser bike - 26" and the tires are 2.125
It seems I can use the same innter tubes for both bikes because I get the ones that are like 1.9 to 2.1 or something. I keep the tires on both bikes at 55 psi which is basicly the middle of the range it says to inflate them to on the tires. After 2 weeks they are down to about 48 psi or so.
I ride both bikes daily and for about 20-40 min each.
When I ordered new tires for the beach cruiser I bought 1.125 and I just realized the oth... Read more >>
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 >>