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spotter-
No idea hence the question. I guess supply and demand dictate they don't however found this:
Jan Heine, Editor, Bicycle Quarterly says:
February 22, 2014 at 6:25 pm
We’ve had no problems running the “standard” version tubeless. The “extralight” casing is more porous, so it can take a little more patience to seal. I have several friends who have run the Grand Bois Extra Léger tires tubeless…
user48109
Out of interest are you thinking of running tubeless on the 650b?
Bike is looking good.