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 live on a bicycle and I used to get flats all the time because of poor road conditions and high tire loads. Fixing a flat is time consuming because I have to remove loaded front and rear bike racks with milk crates loaded with gear and homemade panniers.
I tried Slime, I tried thicker inner tubes, I tried homemade liners. Then one day I put an old 27" worn out old school road bike tire inside my 28"/700c x38 cross tire. It fit perfect after I cut the steel bead away with a scissors.
I reassembled the tire on the rim with no difficulty, partially inflated the tube to... Read more >>
The rim width of my 700c wheels is 25mm. I am therefore assuming these are hybrid wheels and require thicker tyres. Can anyone advise me whats the thinnest tyres I can fit onto my wheels?
Ibie... Read more >>
I took my bike to a shop to get a replacement rear tire. (Old well maintained Centurion LeMans 12-speed) The shop took the tire off, swapped the tire and tube, and put everything back. I know that they lubricated the chain because it was greasy when I checked it. But when I pedaled home, it made a clacking noise. Seemed to be related to pedaling, not so much when I was coasting, more clacking at higher speed. I couldn't put it in the lowest gear. When I got home, I removed the saddle bags and slipped the quick release wheel out of the forks (just an inch or so) then replaced it. Seemed... Read more >>
So I'm not an expert, but I have changed many, many bicycle tires over the years. So why is it BOTH of the brand new Kenda 26 x 1 3/8 tires I put on my 1973 Raleigh Sports refuse to seat properly on the rims? It feels like I'm riding one of those clown bikes with elliptical wheels. I deflated and checked that the tube is clear of the bead and tried everything else I can think of. It's as if the sidewall width varies by 4- 6 mms. Suggestions anyone?... Read more >>
The wheels on my mountain bike are 26x1.5 to 26x(something over 2). I bought the thinnest tire I could that fits this frame (26x1.5) and ordered tubes of the same size. For some reason the tubes have a slightly larger diameter than my tires. Is there a reason for this? I currently have slicks that are 1.90 with tubes to match and those work and fit just fine. For some reason I'm having problems getting the 1.5s to match up. Any thoughts?
[attachment=4592]... Read more >>
Hi, I am currently trying to develop bicycle tyres that will never go flat.
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Thank you!... Read more >>
Just thought I would throw this out there and see what hits. I am currently running a 27x 1 3/8 rear tire. Does anyone know of wider?... Read more >>
I purchased a road bike that is a lemon I'm afraid.
I noticed I could hardly pump up the rear wheel because the inner tube would actual push out and push a small part of the tyre off the rim.
Decided to run the rear tyre with a softer pressure at around 80-90psi, when riding obviously with my weight the pressure was too much and caused a part of the rim to jump off this must have caused the inner tube to pinch because with an almighty bang it went and I ended up walking the bike home.
Question is did this happen because my inner tube was oversized? The ty... Read more >>
I'd like to buy some new tires for my road bike. The road bike is a 1981 Free Spirit Pinnacle and the bike has steel rims that cannot accept pressures over 75 PSI without blowing out. My LBS has been giving me tires that require 90 PSI. When I pump them up to near 90 PSI (85 PSI) they blowout. When I under-inflate them to about 60 to 65 PSI, they have problems and get pinch flats.
My front tire was replaced when I bought the bike because the first time I rode the bike it got a puncture (the bike had original tubes and this happened in 2011) and the LBS replaced the front tire and ... Read more >>
I looking at moving to a new home that will be about a mile down a gravel road, does anyone know a good tire that will work well on both gravel and paved roads? The ride to work will be just over 6 miles (1 on gravel and 5 on paved roads).... Read more >>
I've been using the Peugeot Premiere racer I got given by my neighbour a lot recently, mostly at weekends but I've even been riding it to work, the problem is I have now had two punctures on the bike, always on the back wheel and I think they are always from hitting drain covers or bad repairs in the road.
The front wheel seems like the original wheel but the back one has been replaced with a fairly new one, the rim seems slightly wider and flatter then the front wheel, the tyre is also newer, it's a Nutrax one whereas the front one is a vintage Michelin select.
My son's bike has these numbers on the tire: 700c X 40c 28 X 1 5/8
My son's complaint about the tubes that I buy, that should work based on these numbers, is that when he inflates the tube, then it pokes out from underneath the tire. So what size should we buy, and any suggestions of where to find it? Looking online, it looks like 700c is often equated with 27".
And tied into this question is, he hasn't ever used a liner, but he has frequent flats. I'm thinking of getting a couple of liners, but do you have to adjust the tube size when you use a liner?
T... Read more >>
Not a bike repair guy, but love bikes and mechanical stuff..anyway, got a problem here I don't understand...maybe one of you guys can help. Got a flat on the back tire of my Trek mountain bike and removed the wheel. Then I got the tire unseated (my word) to get to the inner tube and removed the tube. Here's where I'm stuck: I want to replace not only the tube, but the tire itself, which has the sidewall damaged in two spots.
Trouble is, I can't get the damn tire off the rim. Half of the tire is like glued on the flat part of the rim!
I've searched up and down the internet, h... Read more >>
Back in May I had a blowout. My grandpa buys me two new Hutchinson tubes and a new tire for the front wheel. Well, here it is, August, and my rear tube got punctured. I go through tubes quickly, I have no idea why, I guess it is because I ride on the sidewalks of my town where there is (strangely) shards of glass, nails, and other things on it.
So my tube got punctured. I was planning on using a patch kit a friend had and said I could use if I ever needed it. So today, I took the tube out of the tire to find where the puncture was.
It was quickly found. It was a huge ... Read more >>
The original tube size is 26 x 1.9/2.125. The one I got from the bike shop is 26 x 1.25-1.75.
Can I use it or is the size too small?... Read more >>