I have a 2005 1100 Silverado, with about 14,000 miles on the odometer. From any speed form 15 MPH to at least 60 MPH, if I take my hands off the bars, I immediately start to get a head shake on the bike. One or two hands on the bars stops it immediately. I have put about 2300 miles on the bike since I bought it last fall. It has the good, stock Bridgestones, and no changes to anything on the bike. I hardly ever have my hands off the bars, but I am thinking that this could be more pronounced than when I got it. The bike has had the front fender replaced from a "garage incident" I was told by the previous owner. The pinch bolts were a little loose when I checked them today, but I haven't had a chance to ride it since then. I know that some bikes just do this, and you have to live with it. But usually that is at a much narrower speed range, do to tire size, etc. And yes, the tires are inflated to factory specs. It seems to handle fine other than this shake thing. I just wonder what others that have had this same bike have to say about this? Thanks a lot! Mike