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https://www.lfgss.com/comments/15681258/ and subsequent discussion
fizzy.bleach-
Thanks @fizzy.bleach
I'd read through that page, I was wondering what justified the price difference
Found this which has some info
https://bicycles.stackexchange.com/questions/68706/information-regarding-un300-and-un100-new-shimano-bottom-brackets
sacredhart
Un55 vs un300 replacement bb.
Is there any major differences?
Some places still have the 55 in stock but the 300 seems cheaper.