A replaceable hanger can be replaced in the event of damage (crash or the like) that can cause misalignment of the rear derailleur and cassette. This misalignment can result in skipping gears, incorrect shifting and even catastrophic failure.Replacing the derailleur hanger in most cases are the easiest and most effective way to remedy post crash gear issues.A derailleur hanger is designed to break or bend, in the event of a crash, as a first line of defense, preventing your frame or derailleur from breaking or bending. This small part is easier and cheaper to replace than a bent frame or broken derailleur.To fit the bike model: MonzaKansasDetroitNebraska Siera SPECIFICATION Product Type: Rear derailleur hangerMaterial: 6061 heat-treated alloyFinish: Silver anodizedIncludes hardware: YesMount side: OutsideQty of attachment Bolts supplied: 2Tool required for installation: hex bit (Allen key)To fit the bike model: MonzaKansasDetroitNebraskaSiera *Hangers must be fitted by approved dealers/professionals. Weight: 11.67g FAQ How do I know if my hanger is bent? The first indication will be gear problems, sometimes present after an incident, where the rear derailleur may have received impact. Take the bike to your LBS for evaluation. Hangers can be straightened. Hangers can be straightened, why do I need a spare?Perhaps less often, but hangers do brake. The result of which is catastrophic to gearing. Hangers are small enough to keep spare and definitely important enough to have at least one spare per bike. How do I replace a hanger? Hangers are fixed to the frame, and require removal of rear wheel and rear derailleur, to access the mounting bolts. Inspect the drivetrain for any signs of damage consistent with the damaged hanger.
