Message #19198

[jim-ratliff]

Sadly, I was driving back when automobile tires all had tubes as well (and that was well before "radial" tires).  It took people a while to accept that tubeless was here to stay.  I'm not committed to bike tubeless yet, just evaluating now that I have UST rims.
 
As long as I am still a "tube guy" then no reason to buy the heavier tire.

According the mtbr forum, the sidewalls on the earliest X-King RaceSport versions (extra layer of rubber for flat protection) were pretty porous, later versions are much better and had the "tubeless ready" classification.