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I've experience something similar to this. I haven't solved it as it seems to come and go but it's like a chattering sound, particularly on rough surfaces. I initially thought it might be the cables rattling on the frame but it wasn't, now I wonder if it is the hinge clamp. I use the Brompfication clamps and might swap them back to try and rule them out of the equation here. I tried greasing the clamping faces to see if that would help but it got worse, which made me think I was at least looking in the right place.
spj7
@TurtleRecall
My Brompton's just started making an unusual ticking/rattling noise. Not rhythmic, seems to mostly be whilst pedalling, mostly on rougher roads. Not in time with pedal revolutions and not changing speed with wheel or crank speed. I don't think it's the bars, I think I've checked that everything's done up tight (mudguards, those little screw on things on valves etc). I've got Ultegra cranks on there with BBR60 bottom bracket, don't think it's that kind of dying BB noise either.
Any ideas what might be going on?