It's custom build. Carbon frame headset tube bottom is 1 1/4 ID is 47mm OD is 52 Top is standard 1 1/8. I need to fit 1 1/8 fork in this 1 1/4 bottom head tube. I need link to crown race for the bottom. Bottom bearing size is OD 47mm ID 34.5mm 45*. Standard crown race doesn't seat nice on this bearing.
Framesets are generally designed/manufactured with a specific headset specification/type in mind, so when you say the crown race doesn't 'sit nice' - are you saying it's the wrong type for the headset?
Thanks majster. I've just bought standard crowne race and rub it to 1 1/4. It's not perfect but will work for now. If someone needs quick cheap solution to fit 1 1/8 to 1 1/4
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I'd suggest you ask whoever custom built it.