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It looks like a Shimano external bottom bracket (Hollowtech or Hollowtech 2 or sommat). It’s usually a big cup thing that goes on the end of a ratchet, but it looks like you can get open-ended wrenches if you’re stuck and don’t want to take the crank off.
Sorry for Bezolink but this is the sort of thing: https://www.amazon.co.uk/Shimano-HollowTech-bottom-bracket-spanner/dp/B000NONYD8?source=ps-sl-shoppingads-lpcontext&ref_=fplfs&psc=1&smid=A32CWL50OXRGYH
Jonny69
@moocher
Can anyone identify which tool I need to tighten this BB back up?
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