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  • Not sure it is the mdgrd, Ed. I've had mdgrd noises before, following a clumsy fold, and this isn't synonymous with one of those.
    I'll put money that it is metal on metal - very high pitched and quite jarring. I wouldn't mind if it was a nice noise - but it is not.
    I am hoping someone might say 'I know what that is - I had it on my Brompton' to save me going through the process of systematically covering all mating surfaces on the front end of the bike with grease and then test riding it....

  • First thing first, are you aboustely certain it's coming from the front?

    Best thing you can do, put the bike on the stand, check every nut and bolt is torqued, checked clearance, pads, cable etc. and spin the wheel while on the stand to hear it.

    Could be hub bearing need repacking.

  • I'll put money that it is metal on metal - very high pitched and quite jarring.

    I may have had something similar, on my Brompton, with both the original 1992 main frame and the replacement frame I've had since 2012.
    On both frames a little bit of grease on front hinge mating surfaces helped (btw it's not the hinge that failed on the first frame). I never tried grease on the actual V-shaped aluminum hinge restraining part as I've always assumed an aluminum/steel contact wouldn't make that specific noise (one being softer than the other), but I'll try...
    Nothing here you haven't already tried so far but recently as the noise came back a little I noticed that tightening the wing nut too much (I tend to tight the hinges like a brute) was actually promoting the "dry metal" noise, and to my surprise tightening less (more like a normal person would I suppose) made the noise disappear.
    It was never very pronounced anyhow, just a little dry "click" noise as I pedal harder, seems that in your case it's worth, so I can't tell if it's the same phenomena. (I'm using the original Brompton parts btw)

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