Hi, after I put on a set of SI rims on my 98 Civic EX coupe I've noticed when I drive on the freeway it begins to shake when I drive past 70mph. I've had the tires balanced and I've gotten a full alignment but it still shakes... I didn't recall my car shaking prior to this, but is it typical for a Civic to shake at 70+ mph? I'm guessing it has something to do with the wheels, but I don't see any damages done to the tires. Any guess to what may be causing the shaking? Thanks!