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@Cohen
the sr cranks i have, seem to be an extremely cheap road double which you can't change the chainrings on as they are riveted.
They are however 165mm so all is well.
the bb I measured 123mm on has external threading so you use nuts
im ordering a bb with internal threading where you use bolts
will 123mm therefore work on the 'newer' bb?
thanks [and sorry for long-winded post]