M
Mark Runacres
Guest
During the past few months my racing bike (1999, Bianchi with Campagnolo Mirage, twelve thousand
miles) has been intermittently making a loud grinding noise, like two pieces of metal rubbing over
each other. It typically happens when I start to pedal lightly again after coasting. It doesn't last
for more than a second. It feels as if something that came loose is tightened by the pedalling.
Sometimes it occurs a few times in a ride, sometimes it's absent for days. It comes from somewhere
below, between the bottom bracket and the rear derailer. I can't localise it more precisely and
can't induce it on a workstand. Recently, there has been a second, softer noise that doesn't go away
immediately and which I can feel through my saddle. This seems to be accompanied by a slight drag,
although I'm not a hundred percent certain of this.
My LBS checked it and found nothing. I'd appreciate your advice.
Mark Runacres Brussels, Belgium
miles) has been intermittently making a loud grinding noise, like two pieces of metal rubbing over
each other. It typically happens when I start to pedal lightly again after coasting. It doesn't last
for more than a second. It feels as if something that came loose is tightened by the pedalling.
Sometimes it occurs a few times in a ride, sometimes it's absent for days. It comes from somewhere
below, between the bottom bracket and the rear derailer. I can't localise it more precisely and
can't induce it on a workstand. Recently, there has been a second, softer noise that doesn't go away
immediately and which I can feel through my saddle. This seems to be accompanied by a slight drag,
although I'm not a hundred percent certain of this.
My LBS checked it and found nothing. I'd appreciate your advice.
Mark Runacres Brussels, Belgium