Tubeless Valve Stem Flow Test - High Flow Presta VS Jones Schrader

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Air flow test: • Tubeless Valve Stem Ti...
We flow-tested ten tubeless valve stems, including Presta, Schrader, and high-flow stems to see the differences and to find the stem with the most flow because tubeless valve stems with a higher flow rate make mounting tires tubeless easier.
In the late 1890s Presta valve stems were developed with a smaller diameter. This allowed for the drilling of smaller holes in the narrow wooden rims of the time, leaving more wood behind to reduce the risk of cracking.
Now, with wider, aluminum, and carbon fiber rims, the small Presta size is not needed.
Schrader valve stems were designed for bikes around the same time as Presta.
Jones Schrader tubeless valve stems have a larger inside diameter which gives them more flow than high-flow Presta valve stems and other Schrader stems. It's also lighter than many Presta valve stems.
Jones Spec. Schrader Valve Stem description (pair): jonesbikes.com/jones-spec-sch...
Schrader valves are stiffer, sturdier, and easier to use than presta valves. They have a larger diameter than Presta valves, allowing for increased airflow, and making setting up tubeless tires much easier. The 36.5 mm long valve stems work perfectly with Jones aluminum and carbon rims and wheelsets. They also fit many other rims as well. The aluminum base of the stem is smooth, rounded, and lower profile which makes installing tires easier without catching the tire bead on the stem. The large inside diameter features a beveled, all-metal opening for faster/higher volume airflow and no clogging. The large valve stem ring nut has more surface area for your fingers making it easier to turn. It also has an o-ring to keep it tight. The valve cores are removable and replaceable. Sealed aluminum valve caps top everything off and even come with their own integrated tools. One cap is a valve core removal tool and the other is for bleeding air.
Jones Aluminum Schrader valve stems with caps.
-Removable, replaceable, valve cores.
-Sealed aluminum valve caps with integrated tools for valve core removal and easy air bleeding.
-Larger inside diameter for fast and easy tubeless set-up.
-Stiffer, sturdier, and easier to use than Presta valves.
-A lower profile base makes installing tires easier without catching the tire bead on the stem.
-Beveled aluminum base for faster/higher volume airflow with no clogs.
-Large stem ring nut with good grip.
-Replacement valve cores and caps are available.
-Fits an 8 mm rim hole.
-Length: 36.5 mm
-Weight: 24 g (pair)
Jones Bikes has switched from Presta to Schrader on all bikes and wheels!
After comparing and testing Presta and Schrader valve stems, it makes sense to change from Presta to Schrader.
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Опубликовано:

28 авг 2023

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Комментарии : 42

@tomhitchcock1261 10 месяцев назад

Thanks Jeff that was lots of fun. It's amazing that the schrader valve is probably the most common invention known to man. In almost every air tired vehicle from tiny trikes to tractors. Weird fact, I spent 10 years designing high flow air valves like this only for pumps.

@forgetyourlife 9 месяцев назад

The most common invention is the wheel. With or without air.

@jdburnouts 20 дней назад

I've never understood the move to presta valves on mtb, I understand on road bikes with small rims. I've drilled out every rim to fit Schrader valves because they are far superior. I'll have to give your Schrader valve cores a try! Thanks Jones

@watertankhikes 10 месяцев назад

I switched from Presta to Schrader years ago, when I went from i-19 rims to i-23 rims! At the time I was using tubes of course, but I'd always buy Schwalbe or Continental tubes because they had a metal stem with a nut. Similar to what Schrader tubeless valves are now. It's still amazes me how many people are stuck on presta, even for MTB.

@Stoney_AKA_James 10 месяцев назад

Great demonstration Jeff!

@watertankhikes 10 месяцев назад

Another tip is to get a bag of premium Schrader cores that are used in the HVAC industry. The HVAC Schrader valve cores are used for charging freon in heat pumps and AC units, so they have to be high quality. Just use a new valve core every time you top off the sealant, and you won't have any problems with clogging.

@thechodfather 10 месяцев назад

Beautiful, simple, solid , clever engineering…THE best I’ve come across…❤

@slowwerthensnot 10 месяцев назад

Great way of testing

@timomakkonen4525 10 месяцев назад

I have not found clogging to be a problem with valve cores removed. With the valve cores removed, you can figure out the winner just by looking which valve has the biggest hole so what is the point of this video? The only valve in this video that has any real improvement over the old pressta/schrader system is the Fillmore. And that can be improved also and I’m sure someone will do that.

@bimmerbent 9 месяцев назад

Exactly. This has been the bike Industry last 15 years. Something different, then somehow telling the world the tried and true method is obsolete. Some of us did Schrader ghetto conversations years ago B4 Google knew Stans. It's about wheel weight/balance. They both have plus and minuses.

@Onyxaxe 9 месяцев назад

Sorry if you already explained this, but doesn't air flow at a different rate than water?

@Veloperator 9 месяцев назад

Yes. When comparing the flow of water and air through valve stems, the differences in density between the two fluids can lead to variations in flow rates. However, our test was done with low pressure and low velocity, which makes the differences in viscosity between water and air less significant. Viscous effects tend to be more noticeable at higher flow speeds and pressures. So, at low flow rates and pressures, the impact of viscosity on flow behavior is reduced. Also, at low pressures and velocities, cavitation is not likely to be a concern. The purpose of my test was to rank the tubes based on their relative airflow performance, using water as a practical proxy making it easier to see than air. While it doesn't provide an exact comparison of actual airflow volumes, it does allow me to compare and identify which tubes permit more flow than others. Here's a video where I test valve stems with airflow: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-m4NQwAWEsZw.html

@ChrisLoew 10 месяцев назад

Do schrader valves match presta strength when road biking like 90psi? Do they keep debris away from the valve? These are the two rumors I have heard. Neat product, i havent gone tubeless yet or id buy them.

@jaysee2213 10 месяцев назад

As far as PSI, DEFINITELY YES! one of many examples is the forks on an MTB have Schrader valves and they are generally over 100 psi.

@Veloperator 10 месяцев назад

Yes, both Schrader and Presta valves can handle high pressures effectively. While Presta valves are often associated with racing bikes and higher pressures, Schrader valves, were originally designed for bike tires and are now also used in bike shocks running up to 250 psi. Schrader is also used in aircraft wheels, almost all motor vehicles worldwide, medical gas systems in hospitals, refrigeration, air conditioning, and SCUBA gear, among others. In terms of debris protection, Schrader valves hold up very well. Even without a valve cap, any accumulated dirt or sand can be easily expelled when the pin is pressed. Schrader is used in muddy environments, such as on tractors working in the fields. Many vehicles also operate without valve caps without encountering issues. Cleaning or replacing a Schrader valve is straightforward, and finding a replacement valve core is very easy if you ever need one.

@ultraromance 10 месяцев назад

hmm pretty fun experiment. I will have to give them a try!

@ridegreen2k7 8 месяцев назад

How is it practicle to test valves against others with the core removed? When are you ever filling a tyre with the core removed?

@Veloperator 7 месяцев назад

Removing the valve core from Presta or Schrader stems when you are trying to seat the tire bead on the rim for installing tubeless tires, allows for a faster inflation speed that will pop the tire into the rim quicker and easier. Once the tire is on the rim correctly, the cores are reinstalled and then you fill the tire with air.

@allengarrow6295 10 месяцев назад

Jeff you’re a mad scientist! Hey what are your thoughts on drilling out an aluminum presta wheel to accommodate a schrader valve. Our shop (Einstein cycles) gets asked by riders to drill that damn hole bigger so they can use a “ normal” valve… and their air compressor. Usually folks don’t want to have to by an adapter or invest in a tire pump. I’ve drilled out wheels in the past… knowing it would void warranty. That being said we just don’t offer that as an option….skinny road wheels… probably not a good idea, mountain wheel probably not an issue… what do think?

@TylerScranton 10 месяцев назад

Not Jones so not as experienced obviously. But I've drilled out every aluminum rim I have for Schrader. Including my hardtail that I've taken to a downhill park multiple times. I've had zero issues.

@allengarrow6295 10 месяцев назад

@@TylerScranton thanks Tyler! Ive heard people suggest it would affect structural integrity… maybe on a narrow road wheel running higher psi I can see that. Some of the old school mechanics cringe and scream about liability issues the shop may incur. Schrader valves make a lot of sense for set up ease.

@barrycorney3665 10 месяцев назад

I did it to every MTB wheel I've owned that came with the dreaded Presta- 8.5mm drill bit is needed just be careful, go slow and clean up the edges and clean out any bits of metal.

@TylerScranton 10 месяцев назад

@@allengarrow6295 thin road bike wheels I can see, but a wide MTB wheel.... modern mountain bike wheels are so damned strong, there's videos of people hitting stairs on the bare rim

@forgetyourlife 9 месяцев назад

Use a tapered hand reamer.

@sabamacx 10 месяцев назад

I wonder how Dunlop valves compare.

@montanaharkin 10 месяцев назад

So…. we’re not pumping water through our valves, which is incompressible. Can we reconfigure this test with air?

@Jocool0785 10 месяцев назад

Yes air and have the test done with the cores. You’ll see the Fillmore valves will blow all of these out of the water. This is a smoke and mirrors test

@Veloperator 9 месяцев назад

@kevindean9613 10 месяцев назад

Making the hole in existing rims for these ? Is it damaging the rim ?

@Jocool0785 10 месяцев назад

I’d throw on some Fillmore valves and save your rims

@kevindean9613 10 месяцев назад

@@Jocool0785 I already have these , They don't seel well on my hope rims .

@raceface48 10 месяцев назад

Very innovative! I bet the Jones Schrader Valves would make it much easier to seal a tubeless tire, especially with a floor pump. Well done , as always Jeff :)

@jdzasta 10 месяцев назад

Jeff, you are the mad scientist of mountain bikes. Why are we all using whimpy little Presta valves?

@ericpmoss 10 месяцев назад

You may have seen it already, but he addressed the history at 4:51. I think the inertia of adoption is just that -- people get used to something, and it takes time to change their minds. I have to admit that I see Schrader and think "cheap" because it was what was on my first, and crappiest, bikes.

@Jocool0785 10 месяцев назад

If you do a flow comparison with the cores in you’d be surprised to find the Presta valve actually flows more because of the way the core is configured. The Schrader cinching mech (the spring) is internal and the Presta cinching mech (the micro nut) is external. Throw some Fillmore valves on and save your backs

@anotheryoutuber_ 10 месяцев назад

id love a space frame but with 135mm spacing and quick release axles... anyhow thanks for the stem video

@forgetyourlife 9 месяцев назад

Just because something is new doesn’t make it better, it just makes it new.

@barrycorney3665 10 месяцев назад

I only recently found out that there was Schrader tubeless valves- I've fitted them (£9 from Amazon) to my old DT Swiss 26er X1800 wheels I've turned tubeless and will be fitting them to the H1900 E-MTB wheels next time they get new tyres/sealant. I hate Presta so much, necessary on my road bikes but on 35mm rims?? They are so fiddly, the ends can be broken by the pump and the damn cores sometimes unscrew from the tube if you're not paying attention when you think you're just loosening the top to put air in. Sh*t design really.

@yotubify 10 месяцев назад

Great. Now do a bike in size XL.

@jimmypoe4707 10 месяцев назад

Presta is European and only used on bicycle rims. BMW doesn't use them, nor Mercedes. They all use Schrader. In America any air compressor you use is set up for Schrader. For presta you need an adapter, which can get lost. I guess the only reason to use presta is so that you can be all snobbish and euro looking. Apparently that makes you a better cyclist.