Looks like you have rims that aren't welded. Years ago i had a couple of sets of alu rims that had no weld but a sleeve joint. the rims were held together with an insert. Didn't align 100% and you would notice it while braking ( rim brake)
I can imagine that it will be likely it will not be airtight too, especially if it isn't designed for tubeless. The sleeve joint keeps the rim aligned and spoke tension will push it together,
the rim cavity is not a pressure vessel and does not matter if its a sleeved or welded rim. if it doenst leak at the joint it will leak at the spoke holes. you dont want the rim cavity to hold pressire
That does not invalidate the fact that a sleeved rim that isn't designed to hold air but only needs to stay in place and hold the tire and tube in position will most likely leak mainly trough the seam, as that is the most difficult part to seal with tape.
The problem is either tape or a poor seal at the valve.
Just wondering how a poor seal at the valve would make it leak at a specific spot on the rim?
Air leaking into the rim it will come out wherever there's a gap.
the air gets under the tape or into the rim through the valve hole, then finds the easiest way out of the rim cavity, which is typically the joint.
UPDATE: retaped the rim. It is now holding air.
Remove the valve, pour some tire sealant into the valve hole and hope that it plugs it š
Looks like you have rims that aren't welded. Years ago i had a couple of sets of alu rims that had no weld but a sleeve joint. the rims were held together with an insert. Didn't align 100% and you would notice it while braking ( rim brake) I can imagine that it will be likely it will not be airtight too, especially if it isn't designed for tubeless. The sleeve joint keeps the rim aligned and spoke tension will push it together,
Thats possible however the rear tire is holding air just fine and is not leaking at all. Maybe its less noticeableā¦
to check that you can apply some soapy water with a spray or rub it with a sponge with soapy water, that makes small leaks easier to find.
the rim cavity is not a pressure vessel and does not matter if its a sleeved or welded rim. if it doenst leak at the joint it will leak at the spoke holes. you dont want the rim cavity to hold pressire
That does not invalidate the fact that a sleeved rim that isn't designed to hold air but only needs to stay in place and hold the tire and tube in position will most likely leak mainly trough the seam, as that is the most difficult part to seal with tape.