Join Date: Oct 2007
Location: West Yorkshire, United Kingdom
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ISIS is a dead BB type, you can get replacement BB's at the moment, but no MTB cranks have been made in this format for years.
If looking to replace a BB and crank today, would be looking at an External BB solution, or sticking with square taper.
Whatever you choose, would look at the cost of the repairs / replacements vs a new bike, especially as you are working on a 20ish year old bike.