It sounds like metal on metal when I lean right or left and it doesn't happen every time, just sometimes. I thought this was my rear brake FOREVER. I did a bunch of crap for the rear brake and, long story short, I ordered a new one and currently there is no rear brake. Took this to multiple mechanics - all of them thought it was rear brake (although I may have misled them since I presented the issue as the rear break rubbing) so of course it was never fixed.

What could the issue be after all? Is the QR not lubed up enough? Could it be a bearing or something inside the hub?

Riding a Santa Cruz Nomad 2007. There's a small chance that my ears are super super derp and it's actually coming from the front brake - i'll take that off to confirm it's not that. I really don't think it is though, because the whole frame kind of vibrates ( a little ) when the shing shing happens.

Thanks in advance,
PH

Just a couple of days ago another guy had something similar, and it was the computer magnet hitting the sensor

It's hard to diagnose a problem over the net, especially one that mechanics didn't spot with hands and eyes on it.

But the first question is critical, disc, drum or rim brake?

It's a disc break - caliper is not on the bike nor is the adapter. I've looked down while it's happening and the rotor isn't rubbing on anything nearby (that'd be an insane reach to hit the frame anyways.

I don't have any magnets / odometers on the bike

Is it possible that the issue is on the other wheel. Sounds on moving bikes often sound as if displaced toward the rear. Of course the only way to know would be to use another front wheel, or remove that disc or brake also.

Since you're doing a road test without brakes, find a parking lot or other wide flat area to do it.

Otherwise you might be hearing some sort of seal drag in the hub, but not hearing it for myself, I can't advise if it's normal and OK, or indicate a problem.

Well that would have been too easy.

Could also be spokes moving against each other when their tension is reduced a little as a result of your turn.

I had a mountain bike do this and it was the front fork flexing. When it did the rotor would rub the brake pad. Only did it in the turns.

I would check the hub bearings for grease and adjustments.

It iiiis the front!! I analyzed it more closely and it's definitely the front (took off front brake - it stopped). I can't believe I was so sure it was the rear!!!! I didn't even consider the front until I took off the rear brake.

Ray - Did you fix this issue? Can you even fix this issue?

Thanks

I guess that when I said the other wheel you had something else in mind.

Anyway, you can sometimes mitigate the noise by super careful adjusting of the brake, but that usually means opening the disc caliper more than you want to. The fact is that it isn't a problem at all if you don't mind the noise. This kind of incidental contact produces as close to zero friction as is possible to measure (if you can measure it all).