Suppose you have a frame with a 1-1/8" to 1. 5" tapered head tube and a fork with a 1-1/8" straight steerer tube. It's not a problem, you simply need this 110-Series 52/30 Conversion Crown Race to adapt the fork's 30mm o. d. crown race seat to the 1. 5" lower bearing in your Cane Creek Headset....

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