Originally Posted by
Hiro11
One piece of un-asked for advice: before you mount the tire, press down on the valve from the top hard with your thumb to seat it and tighten the nut at the same time. Then carefully tighten the nut another quarter turn with a pair of pliers. Personally, I don't worry too much about matching the taper of the valve to the hole in rim. I've used cheap generics from Amazon for the past two years on various road/gravel/mountain rims without issue.
I had to do this also. Pretty much bruised my palm for multiple days with the amount of force I had to put in to keep the valve from hemorrhaging air. The shape of the gasket was too flat for my curved rim bed.