What bicycle industry are you working for that you need an adaptor? Most modern pumps do both valves or at least presta and the Park Tool inflator works with both valves and so does the Prestacycle inflator both of which are sold on QBP. The SKS head has a integrated chain with a presta adaptor on it you don't even need to thread.

schrader valves over presta valves
 

Shrader high psi.
 

If you think you are losing pressure through a shrader valve, you can loosen and retighten the core. Or you can remove the core to blow any FOD out and reinstall.

On a shrader valve stem... ditch the stupid black plastic cap. The good caps are made of brass and have a little rubber seal inside. Put a tiny bit of atf/motor oil/power steering fluid in that cap and install the cap. After that it’s practically impossible for it to leak out the stem core.

Shrader goes to 500psi in HVAC, 105psi on tractor trailers. Bigger shrader goes to 150psi on tophandlers, 35k forklifts.

If I remember right, shrader is on motorcycle shocks to charge with nitrogen.

Zero experience with Presta- just clarifying any ideas that shrader is inferior for high psi.

Presta is easier to pump to high pressure with a hand pump as there's no valve spring to fight.

???

The pressure in the tire is what you are "fighting".

???

Lots of people, the vast majority, maybe, in the bicycle industry appear to have no issues with Presta valves.

The problem might not be with Presta valves.

People ride bicycles for exercise but can't use a floor pump.

(You can get a schrader adapter for Presta.)

well, strange as it seems years ago bicycles came with Dunlop valves and ridiculous frame hand pumps with rubber hose attachments that quickly leaked and made pumping up tyres a chore. A shop style floor pump wasn’t even available in this country(aus) so people who road bikes for transport would go with the Schraeder tubes so they could easily inflate them at gas stations

Ancient history?

Most people here are carrying (should be carrying) something to inflate their tires. And they are likey riding for recreation or exercise.

​​​​​​​The "bikes for transport" likely typically had wide tires and were often ridden with under-inflated tires.

The pump head pushes on the little pin, and holds the valve open during inflation.

Because I'm a curious character, I just measured the cracking force of a schrader valve to be about 13 ounces, and the valve seat diameter to be about 0.08 inches. It would take about 160 PSI to blow it open with pressure from the pump. So there's a little nub in the pump head that pushes the pin when you attach the head.

Same for me i would go for the option of biying instead of drilling but i think i could see myself doing that too😂

You're right, of course. I didn't think that through very well. I'll blame it on lack of caffeine.

Lack of caffeine meets lockdown induced boredom. ;)

Okay, perhaps you have learnt something or not, before you jump in with your criticism next time, look at the big picture of how people use bikes......everywhere. Many people here( it is the www) preferred the schraeder simply because it offers them the convenience of using gas station air( of course we are not talking about serious Tour de France wannabes) but this forum isnt just for those is it?

with the warm season here, it'll deflate rather quickly like a snapped off presta pintle.

With a presta valve setup & no pump, you could stow two 12g cartridges that will "blow" past the valve. Should net you 90 psi in the tube.

If that's the case, why do I often have to "burp" the Presta valve after my first attempt at inflation with a floor pump fails? The gauge shows that air in the hose reached some astronomical pressure, and yet the valve refuses to open, nub or no nub.

Also, I can report that there was a brief fad among the fellow racers in my home town, back in the mid-1960s, of snapping off the exposed portion of the inner core of the Presta valves of their latex-tubed tubular tires. Why, you ask? So that they wouldn't have to keep unscrewing and rescrewing the knurled tip for the daily task of reinflating the tires.

And also, and probably more importantly, come to think of it, they did it to avoid the common spectacle of the handle of a Silca hand pump launching a good 50 or 60 feet in the air after inadvertently nudging the knurled tip of the valve, instantly blasting all the tire pressure into the pump.

That fad lasted until the first time one of them had a flat and the valve core disappeared irretrievably into the tire's innards.

Aaak, I meant Schrader. I'll correct it after supper.

After this thread finally expires around December 2021, another thread will be started about: "valve stem caps vs no valve stem caps".

November 2021 -
- - General --
"Are smooth valve stems unmanly?"

On a related note, I'm looking for a small pump to carry along that has both a presta and schrader head (like my floor pump) any recommendations?

My tires are all presta, but my airshocks are schrader. Also, it seems bikes around here are about 50/50 and I like to be able to help people if they have flats.

can you fit an adapter on the shocks?
https://www.amazon.com/Adapter-Schra.../dp/B01M3XXRMM

ACE stocks the SLIME brand.

If I lived in a city and had a nice fat tired bike I'd want Schrader valves.

If my mild statement was enough to set you off, you should probably stay off the internet.

How hard or inconvenient is using a pump?