Originally Posted by
eric044
Looks like my Presta stem is the type that doesn't have a removable core. So, that leaves me wondering about the rim's valve hole. I wonder whether I would have luck using rim cement or tire sealant where the stem pops out of the rim.
If it's leaking air, the tire would need to be repaired, the casing opened and tube patched or replaced.
When a valve stem leans one way, then the tire needs to be moved in the same direction along the rim.
It's the same as when truing the tire, lift it off the rim a bit and work it in the desired direction, then move along the rim evening out the slack in the tire casing, going nearly all the way around the rim so that the tire's tension is equal all of the way around.
Do all this before putting a lot of pressure in the tire.
I don't know if I've ever seen a tubular with non-removable core.