This bike derailleur hanger is original Argon 18 and compatible with E112 carbon frames.To ensure and maintain smooth gear shifting, it is essential to have a perfectly aligned frame dropout. If your derailleur appears to be "crooked", it will need to be replaced. The operation takes only 5 minutes and will solve the problem. It is then advisable to check that the dropout is correctly aligned using the tool designed for aligning derailleur dropouts.