[HeadDown]

Hello all

Lucky enough to have taken delivery of a new steed, set up tubeless – my first such experience.

– How do I top-up the air? Can’t find any vids or articles about it, they all address inflating from flat upon set-up. Any air escaping means sealant comes with it, right, and I always get a whoosh of pressurised air when I take my track pump off the Presta valve on other non-tubeless wheels. I suppose whether the tyre was flat to begin with or not is irrelevant really, either way you’re facing the same problem of taking the pump off under pressure and some air escaping.

An additional factor is the novel (to me) concept on these rims, with detachable valves that you only put on for inflating and which otherwise stay tucked inside a valve tool (with the resulting hole in the rim covered by a click-on cover). I’d imagine that screwing and unscrewing them when inserting them will also result in sealant being shot out?

Any tips or ideas gratefully received, thank you.

They are Newmen Streem Advanced R50.
Don’t know if I can add YouTube links here but their website has a video about set-up, and it skips taking the pump on and off the valve (and also inflated it from empty, meaning you don’t have the problem of screwing in the valve when it’s under pressure and with sealant already in).

Topic

[Oldfatgit]

I found out the hard way that
I found out the hard way that even after wheel rotation, give the valve a little blip to force some air from the tyre through the valve.
This will help clear the valve … especially if your Presta isn’t the best quality.

If there’s still sealant in the valve, it’s hard work pumping by hand and if you use a CO2 cannister, the back pressure can unseat the cannister O ring and render the device useless.

[HeadDown]

Yes it’s got to be hasn’t it,
Yes it’s got to be hasn’t it, or else they’d be impossible to to up with air.
Bit of a drag having to have yet another item (this valve tool with valve inside) to take on a ride to be honest. Also got to buy a plug repair kit it seems, so haven’t lost any ‘must take with on ride’ items at all!

[Rendel Harris]

hawkinspeter wrote:

I can never remember which one is which. I tried to associate “Presta” with “pressing”, but both valves involve pressing the core bit so it doesn’t really help.

Funny how some things stick with one: forty years ago I heard a mechanic saying to a customer, “Presta’s a skinnier word than Schrader and it’s the skinnier valve” and I remember it every time I buy new inner tubes.

[HeadDown]

Thank you very much for your
Thank you very much for your time.

[HeadDown]

Mountain bikes shred the
Mountain bikes shred the Schrader!

[HeadDown]

Thanks. I didn’t search that
Thanks. I didn’t search that item specifically as you’ve got to know it’s a problem/search term initially, I guess!
Don’t understand it though (hence not searched). How can turning the wheel so the valves are at the bottom drain out sealant – depends what it drains out of (presumably you want it drained out of the valve itself), and from the position it states for the wheel that can only be draining it out of the tyre entirely. Perhaps I’ve misunderstood, but it’s not suggesting surely that you drain your sealant out of the wheel just to add a few blasts of air (which I’ll probably do every week)?

[hawkinspeter]

mark1a wrote:

Schrader & Presta are the other way round. 

I can never remember which one is which. I tried to associate “Presta” with “pressing”, but both valves involve pressing the core bit so it doesn’t really help.

[AlsoSomniloquism]

From a quick google search of

From a quick google search of how to avoid sealant in the valves.

If you have a tubeless setup, or tubes setup with sealant inside, then it’s worth taking a few extra steps to avoid gunking up your pump.

Turn the wheels so the valves are at the bottom and leave for a few minutes so any sealant can drain out.

Turn the wheels so the valves are at the top and pump up your tyres. The same goes when deflating tyres to prevent goop spraying everywhere.

[mark1a]

pablo wrote:

pablo wrote:

Via the valve. Assuming it’s a skinny road bike wheel it will use a Schrader valve. If it’s a mountain bike it will use a presta valve. Search on YouTube for some videos. Tubeless just means it doesn’t have an inner tube like a car but like a car you still need to add air and generally more often than a inner tubes wheel.

Schrader & Presta are the other way round. 

[pablo]

Via the valve. Assuming it’s
Via the valve. Assuming it’s a skinny road bike wheel it will use a Schrader valve. If it’s a mountain bike it will use a presta valve. Search on YouTube for some videos. Tubeless just means it doesn’t have an inner tube like a car but like a car you still need to add air and generally more often than a inner tubes wheel.

[hawkinspeter]

You can just use an ordinary

You can just use an ordinary pump to top them up and inflating when the bead has already been popped into place. Usually the only time you need a special tubeless pump (or air canister) is when the bead isn’t readily sealing and you want to put a load of pressure in quickly to seat the bead (often with a satisfying “bang”). It’s rare for sealant to come out of the valve when inflating them, so you shouldn’t have any issues.

I hadn’t heard of detachable valves before, though I expect they’ve got some kind of seal so that sealant doesn’t come out.

Found a pic of the valve:

[Hirsute]

Depends what the valve is
Depends what the valve is like inside the rim. Maybe they seal under pressure and so it’s a one way system.

[Author]

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