Abe M.wrote a review of Mercury Wheels S5 Wheelset - Tubeless on February 6, 2020
Familiarity: I've used it once or twice and have initial impressions
Bought these and decided to set them up as tubeless. To my surprise these came with the valve extenders and the rim tape needed, even though customer service said they didn't. I used some extra tubeless rim tape on them but I think that may be over kill. The new tubeless tires were extremely hard to get on. I popped one bead in and struggled for 2 days to get the other in and never did. I had to take them to my LBS and it took 3 people and they broke 4 tire levers just to get them on. These are tighter than tight. I doubt I will be able to change them on the road if an issue arises. That's my only down side. These are light and spin with ease.