Powertap c1 chainring powermeterthe c1 chainring is a full featured crank based power meter that features dual sided measurement the fsa made one piece chainring design provides added stiffness for shifting no matter the terrain features only dual sided power meter at this price pointconveniently mounts to the crank on your bicyclemotion based electronics eliminate additional sensorsdual band ant and bluetooth smart connectivitybuypowertap nutrition training from chain reaction cycles