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Schrader versus Presta valves
Posted by: space-time
Date: November 03, 2021 06:48PM
All the bikes and cars I owned here in USA have Schrader valves except my new bike which has Presta. None of my pressure gauge fit, luckily a foot pump I bought a few months ago has dual adapter so I can at least inflate it and use that gauge to check the pressure.

Why do we need 2 systems here in USA?
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Re: Schrader versus Presta valves
Posted by: Markintosh
Date: November 03, 2021 06:53PM
So irritating, especially if you have an odd size tube and can only find it with a Presta valve.

The metric system...got it, good reasoning there. Presta valve...waiting for an answer on that.



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Re: Schrader versus Presta valves
Posted by: space-time
Date: November 03, 2021 06:57PM
smaller hole in the rim makes it less likely to fail, but that's it.
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Re: Schrader versus Presta valves
Posted by: mattkime
Date: November 03, 2021 07:27PM
WHICH BIKE DID YOU GET?

...also, you can pick up an adapter for a buck or two at a bike shop.

Be glad there's _only_ two standards.



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Re: Schrader versus Presta valves
Posted by: space-time
Date: November 03, 2021 07:29PM
I got the CTY 1.1
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Re: Schrader versus Presta valves
Posted by: cyclemax
Date: November 03, 2021 07:32PM
For a time, narrow rims were popular on road bikes. Schrader valves would not fit between the tire beads on clincher rims. Presta can hold higher pressures than Schrader because air pressure seals the valve. Back in my racing days I was running 18 mm tires at 160 psig. Presta tubes come in various stem lengths for different rim profiles. Aero rims have deep profiles so Schrader stems would not work.
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Re: Schrader versus Presta valves
Posted by: Markintosh
Date: November 03, 2021 07:52PM
Quote
cyclemax
For a time, narrow rims were popular on road bikes. Schrader valves would not fit between the tire beads on clincher rims. Presta can hold higher pressures than Schrader because air pressure seals the valve. Back in my racing days I was running 18 mm tires at 160 psig. Presta tubes come in various stem lengths for different rim profiles. Aero rims have deep profiles so Schrader stems would not work.

A great explanation...from the aptly named CycleMax. Thanks!



“Live your life, love your life, don’t regret…live, learn and move forward positively.” – CR Johnson
Loving life in Lake Tahoe, CA
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Re: Schrader versus Presta valves
Posted by: space-time
Date: November 03, 2021 07:53PM
I agree, great explanation, THANK YOU!
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Re: Schrader versus Presta valves
Posted by: M A V I C
Date: November 03, 2021 07:58PM
This is one of the easiest things to solve. Don't get me started on different crank and bottom bracket removal tools. The random torx head, different shifter mounts on brake levers, handlebar diameters, brake hose connectors...




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Re: Schrader versus Presta valves
Posted by: space-time
Date: November 03, 2021 08:03PM
well since you mentioned it, go ahead. So I don't have to post when I come across one of the other problems.
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Re: Schrader versus Presta valves
Posted by: btfc
Date: November 03, 2021 08:52PM
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Re: Schrader versus Presta valves
Posted by: Fritz
Date: November 03, 2021 09:09PM
I just put a couple of them adapters on my tires. Much easier and less time for my back.



!#$@@$#!
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Re: Schrader versus Presta valves
Posted by: space-time
Date: November 03, 2021 09:34PM
OK these adapters allow you to inflate the tires.

Can you also check the pressure with a normal (Schrader) pressure gauge?



Edited 1 time(s). Last edit at 11/03/2021 09:34PM by space-time.
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Re: Schrader versus Presta valves
Posted by: btfc
Date: November 03, 2021 09:37PM
Yes.
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Re: Schrader versus Presta valves
Posted by: space-time
Date: November 03, 2021 09:45PM
Cool. I'll get some. Thanks
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Re: Schrader versus Presta valves
Posted by: davester
Date: November 04, 2021 12:40AM
Quote
btfc
Yes.

I wouldn't be so sure. It might work but it depends a lot on whether the adapter screws on to the exact point where the gauge will press on the valve actuator....not a sure thing.



"In science it often happens that scientists say, 'You know that's a really good argument; my position is mistaken,' and then they would actually change their minds and you never hear that old view from them again. They really do it. It doesn't happen as often as it should, because scientists are human and change is sometimes painful. But it happens every day. I cannot recall the last time something like that happened in politics or religion." (1987) -- Carl Sagan
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Re: Schrader versus Presta valves
Posted by: btfc
Date: November 04, 2021 12:50AM
Been using them for over 45 years so I’ll stick with yes.

They work with all sorts of gauges in the same manner that they work with all sorts of pumps.
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Re: Schrader versus Presta valves
Posted by: ztirffritz
Date: November 04, 2021 09:05AM
As I understand it, Schrader valves can leak at high RPMs as the rotational force can be enough to compress the spring that holds the valve closed. Presta has a threaded valve and the rotational force would actually seal it tighter anyway. In all honesty, most of us will never encounter that issue, but I think since Presta is more popular outside the US, it's used as a marketing ploy to make a bike feel like more of a performance bike. They can be easily adapted to change to whatever you prefer.



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Re: Schrader versus Presta valves
Posted by: M A V I C
Date: November 04, 2021 11:04AM
I blame space-time for bringing this up. As of today, we now have a third valve - the Fillmore valve. [www.pinkbike.com] At least it works with a Presta pump.

But I also learned that Presta is older than Schrader.




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Edited 1 time(s). Last edit at 11/04/2021 11:05AM by M A V I C.
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Re: Schrader versus Presta valves
Posted by: Racer X
Date: November 04, 2021 11:17AM
Quote
ztirffritz
As I understand it, Schrader valves can leak at high RPMs as the rotational force can be enough to compress the spring that holds the valve closed. Presta has a threaded valve and the rotational force would actually seal it tighter anyway. In all honesty, most of us will never encounter that issue, but I think since Presta is more popular outside the US, it's used as a marketing ploy to make a bike feel like more of a performance bike. They can be easily adapted to change to whatever you prefer.

I've heard this as well.



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Re: Schrader versus Presta valves
Posted by: JoeH
Date: November 04, 2021 12:28PM
Quote
Racer X
Quote
ztirffritz
As I understand it, Schrader valves can leak at high RPMs as the rotational force can be enough to compress the spring that holds the valve closed. Presta has a threaded valve and the rotational force would actually seal it tighter anyway. In all honesty, most of us will never encounter that issue, but I think since Presta is more popular outside the US, it's used as a marketing ploy to make a bike feel like more of a performance bike. They can be easily adapted to change to whatever you prefer.

I've heard this as well.

That is why you use a good metal cap with a gasket on a Schrader valve after filling the tire. Not a problem after that, in fact the high RPMs will cause the cap to seal even better.
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Re: Schrader versus Presta valves
Posted by: mattkime
Date: November 04, 2021 01:43PM
I want to use the same valves Lance used!



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Re: Schrader versus Presta valves
Posted by: davester
Date: November 04, 2021 03:17PM
Quote
mattkime
I want to use the same valves Lance used!

Performance enhancing valves?

I want to use nothing that Lance used.



"In science it often happens that scientists say, 'You know that's a really good argument; my position is mistaken,' and then they would actually change their minds and you never hear that old view from them again. They really do it. It doesn't happen as often as it should, because scientists are human and change is sometimes painful. But it happens every day. I cannot recall the last time something like that happened in politics or religion." (1987) -- Carl Sagan
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Re: Schrader versus Presta valves
Posted by: Racer X
Date: November 04, 2021 06:07PM
Quote
davester
Quote
mattkime
I want to use the same valves Lance used!

Performance enhancing valves?

I want to use nothing that Lance used.

I'd like to use Sheryl Crow. smiley-excited001



********************************************
The police have no duty to respond. See Castle Rock v. Gonzales, 545 U.S. 748 (2005) or Warren v. District of Columbia[1] (444 A.2d. 1, D.C. Ct. of Ap. 1981)

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Re: Schrader versus Presta valves
Posted by: space-time
Date: November 04, 2021 06:57PM
When I was a kind we had Dunlop valves on bikes

[en.wikipedia.org]







Edited 1 time(s). Last edit at 11/04/2021 06:58PM by space-time.
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Re: Schrader versus Presta valves
Posted by: space-time
Date: November 04, 2021 07:00PM
this site shows a few more models

[www.indiamart.com]
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Re: Schrader versus Presta valves
Posted by: M A V I C
Date: November 05, 2021 11:42AM
Interesting. I can't tell the difference between the Dunlop and German valves.

And if you didn't catch it above, a lot of people just put the schrader valve adapter on there and leave it on. They're usually around $1ea, and they just leave one on each stem.




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Re: Schrader versus Presta valves
Posted by: space-time
Date: November 05, 2021 06:12PM
Yes, I bought adapters. Thanks
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