Originally Posted by
Tourist in MSN
Before you order the parts, double check the steerer tube outer diameter. if you remove your stem cap on the top, you can measure the steerer tube quite easily. It might be 1 1/8 inch outside diameter which is much more common on touring bikes.
Your stem would still be attached to the steerer tube to maintain the bearing pre-load, so there is nothing wrong with removing the stem cap to measure, then re-attach.
The OP mentioned the cap was removed and steerer measured.