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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 to reach the crown. Get a little help with the Crown Race Setting System Extension - CRS-15EXT from Park Tools which includes an extension tube and fitting to add a little length to the CRS-15 and 15. 2. The extended length will now let you set a crown race on forks with steerer tube up to 425mm.