https://www.cyclingeu.com/376782/whats-the-point-of-a-bolt-in-here/ Whats the point of a bolt in here? #Bicycling #Bike #BikeRepair #Biking #Cycling #Repair

https://media.pubeurope.com/media_attachments/files/113/067/849/362/479/673/original/a9ef2fea14a39496.jpeg 

 Isn’t that the bolt that attaches the “derailleur hanger” to the frame?