Made to ride a Shan GT with 27.5" wheels, or a SHAN 27 with 26" wheels. With this hanger kit, the chainstay becomes 7mm shorter and the bottom bracket 12mm higher. Absolutely necessary to keep a frame fun to ride with smaller wheels without having your pedals hitting the ground due to a too low bottom bracket. Adaptor IS/PM for 180mm rotor included. For 12x148mm and 12x142mm rear hub, comes with corresponding set of bolts.