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bb30 is a bottom bracket spec, shimano 7800 uses something that's called BSA or english (which is a thread-in type BB rather than a pressed in one).
There's the opposite threaded way (reverse-threaded which is ita / italian).
then there's PF30, BB86, BB92, BBRight, PF46(?).
if you want the most compatibility, go with BSA/english, it'll leave you with the least heartache / creaking.
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