piasta tylna ns bikes rotary singlespeed ridehubA durable and lightweight hub for dirt street bikes, the NS Rotary Singlespeed offers stiffness, reliability, and top of the line features found in higher end modelsat a great price. The NS Bikes Rotary Singlespeed rear hub is designed for street and dirt riders who demand stiffness and durability without breaking the bank. Crafted from lightweight 6061 aluminum with a hollow 7075 aluminum axle and steel hex head bolts, it provides exceptionally solid