Originally Posted by
WhyFi
It can make all the difference in the world with tubeless compatible rims. You end at the valve because the valve takes up space in the bottom of that center well that runs around the rim; you want the tire beads in that well as much as possible for the little extra bit of slack in getting the last bit of bead over the edge of the rim.
I’ve always ended at the valve, that’s how I was taught by the shop I got my first bike from.