The nearly indestructible Mavic Open Pro rims laced to Shimano Ultegra hubs with 32 DT Swiss competition 14/15/14 gauge double butted spokes and brass nipples. Combined with a 3 cross spoke pattern makes a strong, reliable wheel set ideal for training, cyclecross or road environments. Rear hub accepts 7,8,9 and 10 speed cassettes. Presta valve only. Rims are double eyeletted for superior strength. Meticulously Hand Built. That's How We Roll!