ok got it jacked up, put it in gear and it took about 3 seconds to figure out what it was.
i'm not sure but i think that's the e-brake cable line. if someone could confirm for me.
looks like a zip tie broke off that was holding it away from the wheel. when the wheel goes around, the weight on the inside hits it (you can see how it's worn away the weight, which might explain my recent rougher ride).