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@user116252
Thanks for the info, very helpful!
Further reading suggests that there is a lot of speculation on whether the earlier Superbe cranks are ISO/JIS compared to the Superbe pro which are ISO. Im leaning to believe that they are ISO and the Hatta R9400 with 109mm spindle is the most recommended. But then again I'm running a freewheel so I guess I need to measure the chain line and see what would be the best spindle length.
I'm also starting think that the current BB is incorrect as I have had some clicking sounds that only really register on smooth, quiet roads.
Going to have a look at what is currently installed and get the ruler out!