I'm new to cycling, so I'm looking for some help. I just put a new set of wheels on my bike-- mavic open pro 32 spoke rear with Powertap SL, and Mavic aksium front wheel. I was out riding today and as I came down a hill the bike started wobbling pretty badly. I actually felt like I had lost control of it. I slowly applied both brakes and after I slowed down a bit it stopped. I have never felt anything like this before, the only change made to the bike was the wheels. I am 210 Lbs and am riding a cervelo R3. Both wheels were just trued by bike shop. I was riding on the stock shimano wheels before this with no problems. The only thing I can figure is that I am too heavy for these wheels. Does that make sense?