Zipp 1Zero HiTop SW Rear Wheel - 29, 12 x 148mm, Center-Lock, XD, Tubeless, Standard, TyreWiz, A1When one tries the Zipp 1ZERO HITOP SW MTB wheelset, they quickly realize its potential in boosting speed. Recognizing the growing challenges in modern cross country races, there's an understanding that mere stiffness in an XC wheelset doesn't cut it. Instead, the ideal wheelset should exude vitality. The 1ZERO HITOP SW's carbon rim, built with Zipps unique HITOP Technology for carbon layup, harmonizes with the terrain. This creation leads to a