Sort of a weird topic, but I've noticed this a few times. I'll be coming up to a light and it changes at an awkward time, or something happens in front of me, or wahtever (use your imagination), so I've gotta drop the anchors. Grab the front brake lever and get on the rear as well, and every so often I'll lock the rear for the last moment when allllmost at a stop (usually on greasy pavement)… but whenever I do it, it seems like the rear always tends to slide to my left. Not like huge amounts, just an inch or two at the most. Coincidence? Crown of the road? Something wrong with the bike? Bored and figured I'd ask the experts.