Winding over 8735-foot-high McClure's Pass, nice twisty roads highlighted flaws in the Street Glide's chassis performance. The bike shimmies during high-speed (65 mph and above) cornering with changes in pressure-a bump in the road, steering inputs, a sharp change in throttle setting or a shift in rider position. The faster you go, the more forcefully it oscillates. I deliberately wiggled the handlebar to set it off at speeds up to 100 mph in a straight line, and though it never got out of hand, it took longer to stabilize than most other brands' cruisers in the same situation. I also knew just to hold a steady speed, throttle setting and cornering arc and let it settle down. Additional bumps will make it continue or amplify it, though. In my opinion, the biggest danger this creates is to startle the rider into straightening up, which could cause him to run out of his lane, especially in an off-camber corner. There are some aftermarket kits available to correct this problem, which happens in part because the swingarm attaches to the rubber-mounted engine.