Originally Posted by
chaadster
Valve stems are not something specific to wheels, so should not be a factor in your purchase decision.
Valves, and whether their cores are removable, are either to do with the innertube, or if you’re running tubeless, a totally separate and individually changeable component.
So, even if the Mavic wheels include stems without removeable cores— which they probably don’t— you can easily and inexpensively buy a pair of removeable core valves and use them for your tubeless setup.
My original plan was to get the Ultegra 500 wheels. However, I've read that they don't have the removable core. Some people have said that this makes it harder to install the tubeless sealant. My plan is to run my wheels tubeless. I'd like to learn how to install the sealant myself. For a beginner, how important is having a stem with a removable core in terms of installing tubeless sealant?