• Assuming you measure from the centre of the mounting bolt, I reckon I need about 55mm. I did think about filing the brake, but the idea of anything that weakens the brake makes me slightly nervous. I'll try and do some more exact measurements in the morning - it is pretty close on the present brake, so I wouldn't have to lose that much.
    Thanks for the offer - I think I'd prefer dual pivot + I've been offered one cheaply by PM, but it's on the wrong side of London so may not get round to picking it up for a while. So will have a think about filing in the meantime.

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