If you don't ride & race a 29er this post will make abolutely no sense to you. You've been warned.
Tire selection for 29er race tires is limited at best. Switching over to tubeless 6 years ago was a big performance improvement. As far as cycling equipment innovations go, tubeless tires are on the level of suspension forks and clipless pedals. 29ers are a blast - but one of the tougher nuts to crack is tire selection. At this time there is not a single tubeless 29er tire available. The only tubeless option is some sort of conversion using non-tubeless tires. This involves a rim strip to seal the spoke holes and putting some sort of latex (or other chemical) sealant in the tire.
This is not without significant risk, however. There seems to be no standard for producing 29er tires. As opposed to their little 26" cousins, 29er tires almost always fit loose. You can mount a 29er tire by tossing it across the room, it'll land on the rim just fine :) Also, the beads have been breaking or simply blowing off the rim when converted to tubeless. Not good!
Last time I checked Stans recommends only one type of tire for 29er conversions: wire beaded WTB. That's what I've been using all season. The race setup is a Nanorapter rear, Motoraptor front. They weigh in at about 760-780 g each. Ouch.
The big red S comes to the rescue. They've previously announced that they'll never make 29ers...but their
Finally their is a
I'm thinking this tire outperforms anything I've used to date on 29ers...but I'll hold on that call until I abuse them on trails. But putting my bike in the 23 lb range by changing tires? How could that not be exciting! So long as that bead holds...