Good question. I don’t think I’ve ever seen one fitted.
Balancing the tires may help with high-speed stability.
You can also try letting the air out and re-inflating the tires to see if they weren’t fully seated on the rim (that can cause the tires to appear to be not-so-round. Easy to see if you put the scooter up on a crate and run the motors).
A cheater-way of balancing tires is to let the air out of the tire and rotate it with respect to rim by 180 degrees without removing it and then air it up again and see if it vibrates less at full speed (put it on a crate to check). You can also try +/- 90 degrees from that point and see if there is any difference.
Wiping a little soapy water spraying a little windex around the rim/bead of the tire, can help it seat: slide into place evenly. Just be very very careful not to yank on the tube too hard, you can break the stem where it meets the tube.
-Paul from ESG