Bike Front Fork 15x100mm To 110mm Rear 12x142mm To 148mm Boost Hub Adapter Set Conversion Kit. Size：Front 15x100mm To 110mm/ Rear 12x142mm To 148mm. Weight: About 27g. 1 X Adapter. The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness.