Originally Posted by
Synack42
Honestly didn't even cross my mind. It's an older Diamondback Outlook, nothing fancy including the stock crankset. Would it be safe to assume it is JIS? (ISO would really only come into play with European or higher end stuff?)
You are probably safe to assume JIS, though some of the older, higher end Japanese cranks used non-JIS tapers. What particular crank is on it?