Keep your riding steady and smooth Nothing disturbs a group more than a jerky rider, someone who makes abrupt movements that send ripples of fear through the paceline. Pacelines are an act of shared trust. Most crashes in packs or pairs happen when one rider overlaps a wheel with another. So always protect your front wheel. Nothing touches it.
Nothing even comes close.
Your front wheel should spin along as if in an invisible force field. Keep your hands on the brake hoods, the drops or on top of the handlebar near the stem Riding in a paceline on aero bars is a major no-no for several reasons. First, you'll get yelled at by other riders. In some road circles, having aero bars mounted at all is prima facie evidence that you have no group riding experience. Finally, in the event of an emergency, your hands are so far from the brake levers that you'll have to sit up abruptly to find them.