[Closed] Those little presta-schrader adapters.

They're a bit hit and miss in my experience.
Sometimes you lose loads of air when you screw it on.
Sometimes it doesn't seem to screw on quite far enough for the pump or pressure gauge to work properly.
I'd not leave them in place,bas they'd collect crap and might give you the same effect as a slow puncture.

Yes, and yes. I have one on a wheel (whichever I inflated last with my compress) of each of my bikes. For pimpiness and gofasterness I opt for alloy, not brass, apators.

It's generally a good idea to remember after inflation to remove the adaptor, screw the presta valve back closed, and then reinstall the adaptor, but I've gone weeks with an unscrewed presta valve and haven't died yet.

I bought a job lot a while back, they didn't work for what I wanted as the tyres were too loose. DM me your address and I'll chuck you a couple in the post.

Yes & yes, I always used to leave one fitted on my first mountain bike as mini pumps didn't exist then & the most likely way I'd get to pump them up would be a garage or a foot-pump.
Weird that I still carry one in my pack & haven't need to use one for 20+ years!
Old habits eh?

I bought a job lot a while back, they didn’t work for what I wanted as the tyres were too loose. DM me your address and I’ll chuck you a couple in the post.

I'd just bought a couple on ebay before reading that. That's a really nice gesture though mate, thanks!

It’s generally a good idea to remember after inflation to remove the adaptor, screw the presta valve back closed, and then reinstall the adaptor

This.

Dunno how you lose loads of air screwing it on?.

Work great, I've a few wee brass ones, always have one in my wee spares pouch.

There's one permanently in my wallet. They're really useful.

Glad to know they work was looking in to getting some just in case my pump broke while out.....

Get yourself a wee brass one and pop it on a keyring, handy as hell.

I have one but it's too tall, so the schrader valve in side the compressor function doesn't depress the presta core.

Got mine from CRC. So if you're looking for one then get a short one.

Presta has no place on a MTB.

Drill the rim for Schrader and be done with it. If the rim won't drill out for Schrader find the designer/importer/manufacturer/bike brand and smash the wheel to pieces in front of them, cursing and acting like a spoilt child.

Sooner or later they'll get the message.

@wildfire - that's the beauty of Presta; no need to push in the core. Air pressure alone does it. Should work fine even if the adaptor is "too tall".

Regarding:

Presta has no place on a MTB.

Not sure why you think that - might be worth some supporting reasons for your view. IME Presta is generally easier to deal with, cares much less about mud/dirt for inflation, etc. Now those effing Lezyne pumps that seem specially designed to unscrew a Presta core as you remove the pump - those have no place near any bicycle!

There's folk on here who can't operate a water bottle with a lid, and you you want to let them loose on a rim with a drill? ye mad? 🙂

Presta has no place on a MTB

Lol, who said it was a MTB? Well, it is. But with slicks pumped up to max. It's never been near a mountain, but great for getting round a hilly city.

Lol, who said it was a MTB?

Whoops. Apologies I thought I was on a mountain bike forum.

@krixmeister.

Never bent the stupid end of a Presta? Never tried to unscrew the stupid thing with frozen fingers to inflate a tyre? Or worse still had the removable core come out when trying to release the stupid, stupid tightener thing on the end?

Another hangover from the past and should be put out to grass.

Here's a list of the advantages:

1. Remove the core and seating tubeless is a piece of cake (with a compressor). Heck you can even pour sealant in through the valve!

2. Gummed up with sealant? Remove the core and stick in another.

3. Use a valve dust cap that incorporates the core removal tool. (£1.90 for 4 on Merlin).

5. Burped the tyre on a ride? Find a garage and use the airline. Adapters not required.

Hth

Hit and miss for me too, and I also wouldn’t leave on - then you’d need one for each wheel, which seems daft if you have a few bikes.

I used to use the brass adapter for seating tubeless when using the compressor, but now I have an old car tyre inflator which I chopped the end off, so I can jubilee clip the hose directly onto the valve with the core removed. It is guaranteed to seat even the most stubborn DH casing in seconds.

But they obviously work for a few people on here so go for it.

Schrader will leak air over a period of time - apparently because the valve doesn’t lock in place, then when you go over a bump it can cause the valve to ‘bounce’ for a nanosecond, and release a minute amount of air. I suspect it would take a thousand years for this effect alone to cause deflation, but there you go!

Hmmmmm... I guess the seal between the adapter and my compressor attachment wasn't good enough.

I've always questioned why Presta continued to exist at all. It works fine in the shed with a track pump, but liable to leave you stranded in the middle of nowhere if you get a puncture and snap the valve tying to re-inflate with a mini-pump.

Even if they just kept 'presta' but cut out the locknut on top and added a retainer underneath (pretty much making a mini Schrader that would fit existing rims/pumps).

The reason I have Presta tubes, (and yes i agree they're a faff and I'd rather have Schrader) is for the simple fact that I thought/read somewhere that Schrader tubes shouldn't be inflated much past 55PSI. As my bike is set up for city roads, I like them pumped up to like, 90PSI or something.

Have I had bad information?

@marko - OK thanks. I didn't realize this was such a contentious thing. I'm guessing you haven't used removable core Presta valves - which are most Prestas nowadays. They do resolve most if not all of your issues.

1. Remove the core and seating tubeless is a piece of cake (with a compressor). Heck you can even pour sealant in through the valve!

You can do this with Presta too.

2. Gummed up with sealant? Remove the core and stick in another.

Same with Presta. I like these: https://www.amazon.co.uk/Holdlebe-Universal-Removable-Tubeless-Presta/dp/B0761QKNHD/ref=asc_df_B0761QKNHD/

3. Use a valve dust cap that incorporates the core removal tool. (£1.90 for 4 on Merlin).

The nice thing about Presta is you don't even need a dust cap. I never bother. But if you do want one, here ya go, with core remover! https://www.amazon.co.uk/Granite-Nipples-Openwork-Aluminium-Bicycle/dp/B07KK67F7Q/ref=asc_df_B07KK67F7Q/

Or just use a spoke key to remove the core, which you probably have on your multi-tool anyway.

5. Burped the tyre on a ride? Find a garage and use the airline. Adapters not required.

Or just use a tubeless inflator, which I have with me anyway.

Hey fair dues if you don't want to use Presta. But I'm not seeing massive benefits of Schraeder, or reasons to not allow Presta near my bikes!

And - show me Schraeder valves in pimpy colors, like you can get with Presta! 🙂

The reason I have Presta tubes, (and yes i agree they’re a faff and I’d rather have Schrader) is for the simple fact that I thought/read somewhere that Schrader tubes shouldn’t be inflated much past 55PSI. As my bike is set up for city roads, I like them pumped up to like, 90PSI or something.

Have I had bad information?

Seeing as truck and bus tyres can be north of 120psi with Schraeder valves and the rubber the tube is made of is the same regardless of the valve they stick to it I'd say that info is wrong. The original reason we use Presta is to do with the early rims being weaker by the valve due to narrow widths and large holes. As we all use wide rims for MTB compared to the 17mm ones we were on a while back Schraeder valves are a sensible option now.

@krixmeister

I still have the removable core Presta valves on one bike. The ones where the entire core unscrews and the valve flies off into the grass never to be seen again. When I change the tyres they'll be history.

I'm OK with them on road bikes BTW.

Bling!

<span style="text-decoration: underline;"></span>

The ones where the entire core unscrews and the valve flies off into the grass never to be seen again.

Ah, a muckle fingered gibbon! 🙂

Both my bikes are Presta, I do think Schraeder are slightly better, but tbh there's not enough in if for me to start drilling rims and buying new tubeless valves etc, so I'll probably never bother.

I've never broke a presta valve core though, as suggested up there, definitely not.

Presta has no place on a MTB.

Drill the rim for Schrader and be done with it. If the rim won’t drill out for Schrader find the designer/importer/manufacturer/bike brand and smash the wheel to pieces in front of them, cursing and acting like a spoilt child.

Sooner or later they’ll get the message.

All of this 🤣 and this-

Seeing as truck and bus tyres can be north of 120psi with Schraeder valves and the rubber the tube is made of is the same regardless of the valve they stick to it I’d say that info is wrong. The original reason we use Presta is to do with the early rims being weaker by the valve due to narrow widths and large holes. As we all use wide rims for MTB compared to the 17mm ones we were on a while back Schraeder valves are a sensible option now.

Presta has no place on MTB wheels.