Wheel rim valve stems?

[julianf]

I've been working on these wheel rims, and have spotted something -

You can see the valve stem holes?

On the acid dipped rim, it's clear that the valve hole has been moved.

I don't much understand it, as the fillet on the wheel nut holes implies the mounting orientation, and the original stem would have been on the rear.

Irrespective, my concern is the position of the new stem hole -

(That's the inside face, in case it's not clear)

And the outside face -

It seems a crazy place to put them for tubeless tyres (which, the profile of the rim would suggest) as there doesn't seem to be enough flat around the hole to seat the valve stem on.


Is this a concern? I don't know much about these things, so, maybe, it's plenty, but the bend is pretty much on the edge of the hole, hence my concern.

I only noticed this once id painted one of the rims and would rather not mess about now, but it is bothering me.


If I fitted tubes, does the valve on the tube come out on the narrowest part of the ID (I mean in the center of the tube "core") or is it at an angle?

Ie would the stems on tubes line up?

Id rather not fit tubes now anyway, so that would just be a work around. Ideally id like tubeless.

 

[Morris]

I wouldn't worry about it. These are the valve stems on wifey's Pop. No issues.

 

[Keithmac]

You can't tube the wheel with the valve stem hole in that position.

 

[roofman]

looks ok that to seal, but i would fit a motorcycle 90 degree one and have it facing backwards to rotation..

 

[colnerov]

The tubeless valve stem will adapt as Morris says. The valves on tubes are offset a little to cater for this very situation. If you take it to have them built up at a tyre shop they will want to fit tubes anyway because there's no safety bead, so expect to have a discussion about that. I would make sure the edge of the hole is deburred so it doesn't chaff through the valve stem.

 

[julianf]

In classic forum fashion, i now have one comment saying,

You can't tube the wheel with the valve stem hole in that position.

and another saying -

If you take it to have them built up at a tyre shop they will want to fit tubes anyway because there's no safety bead

So... ?

 

[Morris]

Mine are tubeless, fitted without comment.

 

[bricol]

In classic forum fashion, i now have one comment saying,



and another saying -





So.

Tubed tyres around for a long time before the "safety" bead started to appear in the 50s, in general use in the 70s. Tubeless tyres started to become common place around the same time, but the two happenings are not related - the bead is to keep the tyre on the rim, to stop it dropping into the well, tubed or tubeless. Punctured or underinflated tyre, tubed or not, will become unseated and drop into the well if driven long enough.

Plenty of trailers and caravans around without the safety bead fitted with tubeless tyres.

 

[colnerov]

Another thing to think about is that tubeless tyres very often have ribs internally which if you fit tubes to tend to chaff through the tube resulting in punctures later down the road.

 

[OJCar]

Tubeless valve stems will fit that fine.
Safety beads are not present on lots of tubeless rims.
(something got onto the internet that running tubeless tyres on rims without safety beads would kill all the nuns and kittens - utter spherical objects ! )

Looks like its off a trailer or a trolley, is that so?

If you were nearer I'd tell you to bring it here and we'll fit them,
but I doubt you want to drive to Central Scotland...

 

[Blobber]

Measure the holes, if they are agri or commercial they may need the bigger valves as well

 

[premmington]

Measure the holes, if they are agri or commercial they may need the bigger valves as well

11mm standard size...

 

[Turbo]

To me that hole looks too big. There is not enough flat around the edge of the hole for a tubeless valve to seal against.
You might have to weld up the hole and drill a new one.

 

[Blobber]

11mm standard size...

Or 16mm

 

[atomant48]

All our (tubeless) kart rims have the valves on an edge like that and they seal just fine. They run anywhere from about 4 to 40 psi and no issues with sealing.

 

[julianf]

Or 16mm

Hole is a ropey 15.somthing

 

[Turbo]

Hole is a ropey 15.somthing

 

[Keithmac]

In classic forum fashion, i now have one comment saying,



and another saying -





So... ?

It's the position of the hole, not the style of the wheel rim.

 

[julianf]

It's the position of the hole, not the style of the wheel rim.

I understand that. But the end result is the same. One person saying "cant be tubed" and another saying "cant be tubeless".

 

[Keithmac]

I've only been fitting tyres for the last 30 years so will bow out at this point.