[Proteus]

I'm trying to figure out if this is just rider error or something mechanical.

Lately my back wheel has felt "squirrelly" - like the wheel walks a bit side to side. I've had a couple of quick stops that have turned into a full-on slide. One was on a busy street downtown and my bike got almost 90 degrees rotated. I managed to ride it out just fine.

My guess is that I'm using too much rear brake when emergency stopping and I'm locking up the rear wheel. But it does feel a bit like the tire is a bit slidey all-around for the last few days.

Tires are still original.