In order to maximize the lifespan and performance of your headset, you'll want to cleanly face the crown race seat for a precise, low-tolerance fit. The Park Tool CRC-1 Crown Race Cutting Tool does just that, but it requires an adaptor for 1. 5in tapered...
Pro tip: if your fork's steerer tube is longer than your crown race setter, no matter how hard or how many times you hammer the tool, you'll never seat the crown race since the tool makes contact with the top of the steerer before it ever has a chance...
"The Park Tool CRS-1 Crown Race Setter comes with six inserts to ensure that you won't deform your crown race as you pound it onto the fork crown. The CRS-1 set includes one universal setting tube, three 1"" inserts, and three 1-1/8in inserts. If you...