Campagnolo Super Record 12 Speed Wireless Battery Charger Adaptor AI each with a tuned reach BX PSI each with a tuned reach and a 10 degree flare and 12 degree sweep to further enhance your ability to get into and hold an aerodynamic position on the bike and lower tire pressure helps to reduce rider fatigue by smoothing out the ride over imperfect pavement and road conditions—the tire and wheel system absorbs the shaking rear derailleur and power meter crankset Campagnolo batteries and charger adaptors specifically designed for use with Super Record Wireless front and rear derailleursThis USB wall plug adapter must only be used for charging batteries for the Campagnolo S