Hey, Mtb. On-road and off-road both. I leave the wheel holes open. Been my experience dismounting tires without venting that the inserts are completely shot. Moisture rotted. They crumble in the hand. Vented tires/wheels, the inserts fare better. Some even suitable for re-use.
Thanks for...
As a general practice, I vent all the tires I glue. Two holes, opposite each other on the tire. One near the outside of the tread; the other near the inside. I do that so centrifugal force generated by tire rotation tends to fling any accumulate water or moisture out during a run.
With...