My bike has started making a high-pitched whistling noise when I get moving and I'm not sure what's causing it, though I have a suspicion.
- It starts happening after a few seconds of pedalling
- It gets higher-pitched the faster the bike's going
- It's dependent on the speed of the bike, not how hard I'm pedalling
I tried pushing the bike along a short distance and couldn't hear it but I might just not have been going fast enough.
So, that suspicion about the cause. When I got it out of the bike shed at work last night, the seat and handlebars were covered in some kind of dust. A colleague realised that it was probably from the work in the car park that day - someone was cutting into the road surface and apparently kicking up a big cloud of tarmac/concrete dust that could've easily gone through the widely-spaced slats of the bike shed.
Could that dust (presumably gumming up some lubricated part) be the cause of this noise? If so, where should I focus my cleaning?
If not, any ideas what it could be instead?