Headset cup drifts for use with the Wheels Mfg Headset Cup Press. 1/2" thru hole. Drift is machined with steps to fit common headset cups with 1-1/8" and 1-1/2" bearings. May work with other size cups. Not recommended for use with Wheels Mfg PRESS-1 or PRESS-4 handles and rod, which have a smaller 3/8" diameter rod.
We do not recommend it for use with our PRESS-1 or PRESS-4 handles, or any other press with a rod diameter less than 1/2". When used with a smaller rod, it is almost impossible to prevent the cups from pressing in straight.
Headset cup drift fits cups with sealed bearing inner diameters:
Outer diameter of headset cup drift: 2.5" (63.5mm)