Which Tool Allen wrench 5mm or Torx T25 or T30 (Athena 11speed rear derailuer)
I am trying to mount Athena 11 speed rear derailuer (possibly 2011~2013 version) to hanger but I am so confused which tool to use. Some says allen wrench 5mm and some says Torx T25 or Torx T30. Also do I need to rotate from back side of derailuer or front side of derailuer? Please help~~ Thanks in advance!