Brake rub when bike is leaned over

[sethschmautz]

My Gravel bike seems to have an issue where the brakes rub when it's leaned over on a turn or while sprinting. I've tightened the thru axles and checked rotor and caliper tightness and everything looks okay. Is this due to hub bearings? Anybody have this happen?

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[crashidy]

The wheels flexing can cause this. Spokes tensioned properly?

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[toast2266]

Could be:
- alignment is just off. If your caliper is set so the pads are super close to the rotor, a small amount of flex can make it rub.
-Frame flex. If this is a new phenomenon, check for cracks.
- hub issues. Check for bearing play, broken axle, cracked hub shell.

If you have a different wheel, throw that in and see if you can replicate the rub. That'll narrow your list of potentials.

[sethschmautz]

The wheels flexing can cause this. Spokes tensioned properly?

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I was thinking that because the hub is tightened via the thru axle and the hub should be generally stiff that this would be low probability - that it would take a lot of deflection at the rim/tire to get the hub or rotor to move much, but maybe not?

Thanks @toast2266 for the other suggestions also. I'll rate a closer look. I bought the bike used and there was a little of this early on also.

Seth

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[crashidy]

Yeah what he said. But yes it can happen from a few things.. Depending on rotor size, heat, pad spacing, wheel tension, bearings, frame flex. Bikes see a ton of forces.

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[EWG]

Bent rotor would just make it worse so you could check that too.

[Falcon3]

It doesn't take much to clip the rotor on the pads, there's not a ton of retraction. Make sure your rotor is true, recenter the caliper, check your wheel bearings, it should fix it.

I had this on my FS when I changed wheelsets, recentering the calipers (unscrew, spin wheel fast, slowly clamp brake and then hold it hard, then screw in caliper bolts) fixed it and I haven't had any trouble all season since then.

It's definitely annoying hearing the "ring ring ring!" as you're leaning the bike over though!