
Giant’s OverDrive 2 delivers up to 30%-better cornering and sprinting stiffness and control than non-tapered front ends with:
1/2) 1 ¼-inch/1 ½-inch diameter bearings
3) 1 ¼-inch diameter Giant stem
4) Tapered fork steerer
5) Giant OverDrive steerer plug

This manufacturer's chart helps you evaluate the fit (may show unavailable, and/or not all sizes).