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.
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.
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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 >>
I'm looking to order a new front rim online to save a few bucks but it's a little difficult to choose the correct size. Ideally, I'd like to order the same size rim, or at least one for which I can still use the old tube and tire.
Rim size: 622 x 17
Tire: 700 x 35c
From my research online, I know 622mm is a standard/common rim size, and 17mm is the inner width of the rim. For the tire, the x35 refers to the size of the tire when fully inflated. Is this correct?? Also, from Read more >>
I am trying to fix up a bicycle for my nephew The tires on it are dry rotten, but read 26x1.50, I went to the store to buy these, but they only had 26x1.75, which I bought 2, along with 2 1.70 tubes. Will these work on the bike rims? I have been the route on the charts, but didn't understand, would greatly appreciate a yes or no answer!! Thanks!!... Read more >>
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 >>