I did not have this problem on my mountain bike, but today I took my new Specialized Dolce out for my first ride... and when I take one hand off the handlebar to signal, the wheel starts to wobble and gets so shakey!!! I'm used to the stability of the wider tires of my MTB, but I didn't expect the loss of control I experienced with the skinny 700's. Is there a way to grasp the handlebar with the other hand, or some other stabilizing trick I could use????