Odd "creak, clink, or clank" from the Brompton while pedaling
I'm out and about in Charlottetown, pounding away on my Brompton (yes, the other delegates are MOST impressed):D
I've noticed that on my pedal downstroke, there's an odd - well - clank, click, or creak noise. It's not loud, but it is noticeable. It does NOT happen when I'm just coasting, nor does it happen when I pedal backwards. I can't see anything obvious hitting the spokes or touching against moving parts. Given that it only happens during the downstroke of my pedals, I figure it must have something to do with those parts, particularly under load/pressure.
I was thinking it had to deal with the crank because that's where the noise seems to be coming from. However, if it had something to do with the crank, would it not make a similar noise when reverse pedaling? It actually sounds like something banging against something else.
Other than the gearing or the crank, I'm starting to wonder if it's the foldable pedal. I notice that it does not sit perfectly (unlike the nonfolding pedal) on the pedal arm connector, and maybe there's just enough clearance or gap that it makes a little clinking noise as it settles on the downstroke.
Pure speculation but I'd appreciate some insights. Thanks.