Get a TPU tube with 40mm valve and use a crack pipe. It'll leave plenty room

https://www.bike24.com/...2d-87b1-6538a379ea64


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https://www.bike24.com/...2d-87b1-6538a379ea64

I have the same setup, down to the tubes and pump. I attached a Silca Hiro chuck to my Joe Blow pump, and it works great. Though admittedly, on race mornings in transition, I carry a Fumpa now.

I use one of these: Mellbree 2pcs Valve Stem... https://www.amazon.com/...ppx_pop_mob_ap_share

With one of these screwed on: Bike Bits Brass Presta Valve... https://www.amazon.com/...ppx_pop_mob_ap_share

Use a bit of loctite to keep the adapter from unscrewing from the hose. Screwing it on to the valve stem causes almost no leakage and it’s sealed once it’s screwed on. Then you can use whatever schrader pump you like. I use a mini Fumpa. The whole kit along with a tire plug kit (I run tubeless) fits in the behind the seat container on my QR PRSix2.

Get one of these:

https://www.amazon.com/...ing%2C142&sr=1-1

Ditto above - I have the Silca Hiro chuck for my HED disc, and it is great. It is by far the best chuck on the earth. And also ditto above that on race day, I use a little electric pump with a crack pipe.

Use a dremel and make the opening larger. Seriously.

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Favorite Gear: Dimond | Cadex | Desoto Sport | Hoka One One

Silca Hiro chuck, nuff said.

I have a HED Jet3 Plus; though it was always set-up tubeless (I figured it would be better to limp home than be stranded).

The following worked for me when using a slightly short valve (can't recall exact valve length)

Topeak Pressure Rite Presta

I did this exact same thing. Best decision ever. Made it just a smidge bigger but what a difference that made even with using a Hiro.

I use the Fumpa. It's awesome

My problem with that Topeak is that it was impossibly difficult to screw on/off the adapter to the presta valve given the small space. I'd need pliers, I think. I returned it for this reason.

I have the exact same wheel and tube set up. I've found it very doable to do myself by making an adjustment on the placement of the pump in relation to me. I keep it close and use my dominant hand and shoulder by leaning into it. It isn't the greatest solution, but it beats buying a $70 chuck head. At some point I might bite the bullet and do it. But for now, I use the crack pipe and do it myself.

Thank you. How do you handle pumping up in case of a flat?

Good question.

I have the CO2 inflator with the separate head. I haven't tested it or even tried to see if it worked. I have 2 spares and 2 tubes in my Speed Concept draft box.

Thanks. I also carry 2 tubes. One thing that's annoying is that for disc, I need a tube with a short valve, whereas for the front wheel it would be a long valve unless I also mess with valve extenders. I really wish the disc cutout would accommodate both long valve and a slightly bulkier chuck head.

Not really confident enough to dremel my way around the $1k+ wheel though...

I ordered a few things suggested above, will report to see how it goes. I'm starting to more seriously consider going tubeless for race wheels, but none of the problems go away in this case - I'd still carry spare tubes and would still need to figure out how to pump them if I were to get a flat...

Using a Dremel tool on that non-structural carbon is easy.

It’s just a fairing though. There’s nothing at all structural about the disc part of a Hed Disc as it’s a permanently affixed cover to a spoked wheel. Basically you’re just sanding down a few millimeters around the opening.

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Favorite Gear: Dimond | Cadex | Desoto Sport | Hoka One One

Another vote for the Silca Hiro.

This x2. You can also sand it down if you don't feel comfortable with dremel.
Then put scotch tape on during the race or a sticker and you're good to go.

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Next races on the schedule: none at the moment

Which head does your Joe Blow have? There are a few different ones depending on which model pump you have. Maybe it's changed, but I never had trouble with the "SmartHead" version fitting my HED wheels. At one point I even replaced the head on a Silca pump with a SmartHead because it fit so well...

This pump head is really tall compared to the black Lezyne linked above. Kinda defeats the purpose, no? It definitely wouldn't work on my Citec wheel.

Yes that‘s a bit the problem with this thread, the op asked how he can pump up a disc with an extraordinary small hole, and everyone answers which system he/she uses, independent of the fact if their disc-holes are small or not.
I also have a citec, and tried a lot of 90° chucks which did not fit until I got the chuck and lezyne pump I linked in post #3 and o yeah, that works very well.

 



I have the same lezyne pump and speed chuck, and while yes, it's tiny and does work (if this thing doesn't fit in your cutout, probablky nothing will), I still end up having to pump one-handed while the other hand has to apply pressure to the chuck.

I do have a Silca Hiro as well that does fit in my cutout but is definitely more finicky, and most of the time also requires me to hold it on for the air to move.

I'm still looking for a good solution that doesn't require the one-handed pumping. Tried the extra extender trick and maybe my extender wasn't long enough but it wouldn't bend far enough out once a bit of air got in to work.

I might even go with an electronic pump like a Fumpa (sold out in most places now) if I can attach the Hiro to the head so it'll do the pumping work while I just hold the Hiro onto the presta valve. I hate one-handed pumping at high pressure, and I do it a lot when I'm using my disc wheel in training due to the latex tubes.

Geez, dont go cutting the hole bigger etc....
Get this cheap adapter and youre good to go.

Problem Solvers 90 Degree Presta Inflator - Performance Bicycle (performancebike.com)

Works every time for me.

That's how I do it (I also ride my disk in training with latex). But I do not regard it a huge problem. Use the Joe Blow for the front wheel though.

The classic hash pipe.

I posted about a Topeak adapter and didn't mention anything about Lezyne. You would have known that I posted about a Topeak had you bothered to read my post and quoted it in its entirety.

FWIW, I pump up my Jet Plus Disc using a Lezyne pump, but that's wholly irrelevant, because at no point does any part of the pump head go into the hole.

I was a little hesitant about using the valve extenders myself but they've really worked out great I have the same size tubes in my box and just use the extender for the front if needed.

I personally would not Dremel or cut out the disc cover cuz I'd be concerned about warranty issues if it's still within the warranty. From hed.

That's some irony saying I didn't bother to read... Longtrousers seemed to understand my response, but let me spell it our for you.

I am saying your Topeak adapter (the one quoted and referred to as "this pump head") is tall and not well suited for small cutouts. In comparison, the black Lezyne adapter mentioned in post #3 (the one I referred to as "the black Lezyne linked above") is much shorter and better suited to small cutouts. The black lezyne one is short enough to fit in a Citec cutout with 40mm valve, but the Topeak adapter wouldn't fit.

Thanks for clarifying everything on the second go (not sarcasm intended)

Had you originally wrote what you wrote above, I wouldn't have responded to your post

I just tried the Topeak adapter and returned it.

My cutout isn't even that small, but it was literally impossible to fit my fingers around the screw-on portion of the adapter to screw it on or off. Couldnt' get it on even the slightest bit.

 
Here is my setup:

Lezyne Classic Floor Drive Pump - has threaded chuck that the Topeak threads on to. link
Topeak Pressure Rite Presta Valve Adapter

I have no issues pumping up my HED Jet Black Disc wheel or front. The threaded chuck works great with the Topeak Valve adapter.

In general, I find it a stupid stupid thing that it is the year of our Lord 2022 and disc wheels have been around since at least the Last Supper and we're still dealing with this shit issue with wheels, adapters, odd hoses, cussing, swearing.

Why not they start making something smarter access wise for disc wheels?

Thanks. To your reply in particular, the crack pipe I have is similar to this one, and I don't see how this one would solve anything: I would need another pump or chuck or something for the pipe end to stay securely in without hissing air while pumping.

Lots of replies here, appreciate people sharing ideas. I bought a Fumpa. Tried using it like so


Note, I can't actually pump this way since the pipe doesn't really stay securely in Fumpa's receptacle, but when I'm holding it together instead of holding the phone to take a picture, it somewhat works. I put some insulating tape on the pipe because it gets stupid HOT after just a few seconds of this. I can probably get it to the pressure I want if I really had to, but I tried twice and it's still underpumped (no way of telling what the pressure is, I'm trying to get it to like 75). I didn't want to push the Fumpa because it was $160+ with tax from eBay, and I'm returning it.

Will reply to another suggestion below.

Thanks! I ordered these cords because I thought maybe the angled pieces would work, and the presta -> schrader adapters you suggested. I couldn't get anything useful out of the cords themselves, but using the adapter on the tube valve, then the angled piece on the adapter, and then the schrader position on the pump head it actually worked ok. The pump pressure gauge still shows nothing but at least I can pump it to what I guess is the right pressure much easier than with just my crack pipe.

Thanks! What do you carry with you during the race to pump the disc after you change a flat? (if it's the Topeak Adapter, then what CO2 chuck works well with it?)

Maybe part of the struggle is that you are attempting to do it with the valve at the top of the wheel?

I always put the valve at bottom of wheel when pumping and firmly press down with left hand while pumping with right hand (and shoulder area as mentioned before). If I tried to pump with it upside down like that it wouldn't work. Let gravity help you.

I tried several of the chuck heads suggested here and none worked for me on my HED disc. I used the 6” hose because it allowed me to get a straight shot at the presta valve and screw it on. The hose also acted as an insulator for the Fumpa; only the pump would get hot. I could get up to 80 lbs and that was all I needed for my 28mm tires.

Thanks! What do you use to get at the tube valve with Fumpa? Does the Hiro chuck screw in or connect without leaking into Fumpa somehow?

So far, the presta -> schrader adapter and a different version of the hose you suggested is my best bet to use with the pump, thanks! How do you connect the hose to Fumpa?

The Hiro can thread directly into the nozzle on the Fumpa (easy to use if you have easy access to the valve on your wheel). But I went ahead and purchased the extension nozzle with my Fumpa, and attach the Hiro chuck to that. This makes it a bit easier to top off my tires while my bike is racked in transition.

Ah got it, thank you! Must be what they call "ELBOW NOZZLE KIT". Yeah, I should have looked for that too, makes sense.

The elbow kit might work as well, but I meant this extension : https://www.fumpapumps.com/...cts/extension-nozzle

The Hiro locks into the chuck on this very easily for hands free (aside from handling the pump itself) operation. And its easy to tuck away in a morning clothes bag. I'm sure there are several products that can accomplish the same goal, but the Joe Blow + Hiro for normal situations, and the Fumpa + extension nozzle + Hiro at races has been working extremely well for me.

Got it, thank you.

Sorry for the 20 questions, just curious: if you tuck it away into your morning clothes bag, then what are you left with if you need to change the tube during the race?

If I get a puncture during a ride, my flat kit contains a CO2 inflator nozzle and the Silca disc valve adapter (aka the "crack pipe'). Works great for filling spare (butyl) tubes with CO2 cartridges. If I don't want to use CO2, I sometimes carry a Lezyne Pocket Drive, which has a hose and therefore needs no adapter. But it is a lot slower to inflate.

Thanks for all your help!