Originally Posted by _ForceD_

I’ve kind of wondered why the Presta valve core is removable to begin with (although not all Presta valve cores are removable). And of course some Schrader cores are removable too. Why? Price-wise, and the trouble...it seems like just replacing the tube would be more prudent if there is a valve problem. On a big car or truck tire...I can see that replacing the valve core would be easier than dismounting and remounting the tire. But with a bicycle tire/tube...what’s the purpose?

Dan