They really did a good job when they redesigned the bob as a swivel wheel. First, the wheel locks out, to elongate the wheel base. Second, the tether strap is connected through the foot brake. So, if you do happen to fall, and are using the tether strap properly, the stroller won't go running away. YOu fall, you have the tether, as stroller continues while you on ground, tether locks stroller.
Now, if you want a baby jogger jogger, you have to get something like the summit, instead. The issue I have with that one, is that it states not to exceed 3 mph. Well, I can WALK at least 4 mph, when pushing it. but I believe that is so that you don't rollerblade/skateboard/bike with it, kwim? Still bothers me though.
Now, if you are a true jogger/runner, you want a fixed wheel, just for that, with hand brake, tether, large at least 16 inch wheels all around.
Also, the bob has a patented tracking screw...