|WTB's Nano 40TCS led the way, but others are coming|
WTB's Nano 40 TCS tire was the pioneer here. With TCS rims already in existence, both in rim and disc brake versions, the introduction of the Nano TCS meant that a true system approach for gravel bikes was attainable. I've used the TCS Nano extensively since it's introduction and it has worked very well. I can run any reasonable pressures I want, air retention has been good, and the performance of the tire is also quite good. I have had some reports of premature wear issues, but nothing that affects its tubeless performance that I am aware of has been a negative so far.
So, that's one choice, but obviously, there needs to be more, and the good news is that there will be several more tires soon. What "dimension standard" they use is yet to be determined, but I feel these will be like WTB and be based upon UST type tubeless dimensions. One of the announced additions to the tubeless gravel tire scene is Schwalbe, who have been a brand that has been highly regarded in the past by gravel riders. The other exciting news is that a new tire brand called Teravail will debut soon with a gravel specific design tubeless tire in a 38mm size.
These tires, and probably more we don't know about quite yet, will be coming out, likely late this year and early next year. The wildcard is what rim type these new tires will be designed to. Again, I hope that it is UST and not a marginal, half way in between UST and Stan's deal. Time will tell, but the good news is that there is progress, and soon there will be no reason to run tubes in gravel road bike tires. That will be a welcomed time.