Freezing rain outside today so I used the weather as an opportunity to pull the tubes out of my MTB wheels and put sealant in them since both the wheels and tires are tubeless ready. The rims are even tapeless. I guess the previous owner preferred tubes.

Anyway, pull tubes, insert TL valves, add sealant, and hit them with the compressor and snap! bang! instant TL wheels in under 30 minutes.