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@tbc
It is the Dolan, and as such is not geared.
The new BB has actually pushed the chainset a bit further away from the chainstay, so it isn't that, though I have seen that's an issue on a lot of Dolans and was on mine too. Also I think the noise is even more tinny and 'tingy' than that would be. It sounds almost insignificant, it sounds just like what BMMF said, thought it can't be that.
I will try tightening the crank bolt a little more, as I haven't re-checked it since I installed it, and since then I've done a track session and Highgate Hill.
Could it be something to do with incorrect BB installation? I'm pretty sure I've done it alright, although I'm always hesitant to trust my own skills in things like this. When I look at the cup on the BB shell, it doesn't look quite straight, though that might just be my own paranoia, and the chainring seems perfectly straight. Should I take it apart and put it back together again?