Ok..I've had the OME HD springs on it for about 3 months and 5K. I've developed a bit of a shimmy around 50-55mph, over the last 1500 miles or so. I don't feel it before or after those speeds. I can feel it in the front end through the steering, and seat of my pants. What's causing this. I've been busy and haven't had a chance to get under it to check things out. It almost feels like an out of balance tire, except it only does it at those speeds. Most out of balance tires that I've had shake all the time.