We just had major problems w/ WTB rims and getting tires to hold air. Their center channel is pretty deep. We taped the rims probably 5-6 different times and then gave up. We called WTB (they're right down the street from us) and they brought some silly little bits that were supposed to go between the valve lockring and the rim. They didn't help at all. I had mentioned to the guy working on it originally that I've seen some narrow (width of the center channel basically) red tape w/ some WTB rims. We called, asked for that and boom...no more leaks. It goes under the normal tubeless tape. That would help w/ seating as well. I'm pretty much convinced that their stuff just kinda sucks.