Quad Wheels Presta Stem Saver for Schraeder Rims, Black, (47817)

They work and are good quality.

Works great, used it to install some ultralight TPU tubes in some old 26" MTB rims from the 90s. Looks better than plastic and I have more peace of mind that it won't break or that it won't tear a hole in my tube.

Perfect fit in schrader stem hole to convert to presta!

Overall - no issues. These shraeder-to-presta adaptors work great. I hate Shraeder valves, even in my kids' bicycles. Sure - tubes with shraeder valves are great for air compressors, but presta valves are so much easier to use with a good quality floor pump. Important to install these presta adaptors UNDER your rim strip or rim tape. One - the tape/strip keeps the adaptor in place better. Two - the strip/tape helps protect the soft rubber tube against the rougher metal edges of the adaptor. My only complaint is that these presta adaptors are not manufactured in different heights. I installed a pair of these on my kid's 24" bicycles. They work. I've swap out the shraeder tubes over to presta tubes. This is just me and my preference, but I really wish that my presta adaptors were about 3-5mm shorter. It's not a huge difference, but a slight shorter adaptor would allow my floor pump head to seat tighter and better on the presta valve stem. That's all. I also imagine that some cyclist may prefer to find these presta adaptors in slightly longer lengths too if they are running deeper walled rims.

I got a set of rims that had been drilled for schrader valves and when I researched installing presta tubes, no one warned me of a problem beside that it may rattle a bit and I consider that a minor issue. This was years ago.One day I aired up my tires and when I got to my destination the tire tube completely flatted in front of me in about 5 seconds. The rim hole had cut into the base of the tube. I do have rim tape and it is slightly misaligned which could be a bad thing, but the hole for the valve was a bit sharp and eventually it cut into the tube. In this case it took many years for this to happen but the reliability is a big problem.I noticed someone had one of the plastic sleeve but was installed on the outside of the rim next to the spokes, this was more a false sense of security.Installation of these sleeves from the inside should solve this issue. It may seem like a hassle, I did not remove the wheels, I simply deflated, took the tube out and press it in. As I mentioned the tape was a little misaligned, so I lifted the tape with a small screw driver and then inserted this sleeve into the tape and then onto the rim. It only took a few minutes plus a few more to inflat the tires. I do notice the plastic sleeve I had cannot fit back in completely.. But the root cause of the random flat tire has now been resolved.

I really didn't care what the cost was (in relation to what I (might) think the product should cost. The important thing is that it worked perfectly. And I apologize that I didn't have a pic of the adapter from the inside of the rim. BUT, the pic I did take of the finished presta valve after installation.I used just a dab of Gorilla glue on the inside of the rim (probably overkill). After 2 weeks, the tire has not lost 1 pound of pressure. I highly recommend this product if you want to get all your 2-wheelers of the pedal variety on presta valves.

I wanted presta tubes on my Brompton. Very easy to install. Rim tape holds them in place. Perfect length for my rims.

If you have bicycle wheels that have been drilled oversize for Schraeder valve tubes and you want to use Presta tubes, these bushings are the bees knees.