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Sent my bike to be build up at my lbs. he called me to say my hope external49 bottom cup can't fit into the lower head tube. My frame internal is 47 and the cup is 49++. There is too much difference in the diameter and he is afraid pushing the cup might crack the head tube. Any pointers on how to fix this? Should I just tell my builder to force the cup in or shim down the headset?
 

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Sent my bike to be build up at my lbs. he called me to say my hope external49 bottom cup can't fit into the lower head tube. My frame internal is 47 and the cup is 49++. There is too much difference in the diameter and he is afraid pushing the cup might crack the head tube. Any pointers on how to fix this? Should I just tell my builder to force the cup in or shim down the headset?
456 carbon frames have a 49.6mm lower head tube diameter, not a 47mm.

The Carbon Whippet frames DO have a 46mm internal head tube though. I do hope you've been sent the right one.

Got a pic?
 
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