The Stans NoTubes ZTR Grail Disc Rims. From our much copied wider rim design to our ground-breaking Bead Socket Technology rim profile, we've made a habit of thinking outside the box-section when it comes to rim design. Our new Grail continues the NoTubes tradition of function-first innovation. Countless hours spent working with our professional road racers and cyclocross team led us to create what just might be the ultimate disc-specific rim for road, cross and gravel.  Stans NoTubes ZTR Grail Disc Rims Features Size: 700c/622 Hole Count: 24, 28, 32h Colour: Black Weight: 460g Two layers of 21mm Yellow Tape required Grail - fine with tubes.  Grail tubeless at high pressures must be run with Road Tubeless tires at pressure ranges stated on tire. Grail tubeless at low pressures (under 40psi) must be kept under 40psi and or used with the TR or tubeless tire.