Park crs1 crown race setting system 1 1 18 steerer a fast and precise way to set fork crown races in place choose the correct insert then slide the tube over the fork tube and into the top end of the insert using a hammer tap firmly on the end cap of the tube and seat the race into its proper place safely and accurately supplied with three 1 inch setting rings and three 1 18 inch setting rings the crs 1 will work on forks of 340mm column length or less