Hello all,
I've replaced my chain, cassette and derailleur today and am now experiencing a chain flapping noise when riding. I checked the chain length using a calculator (114 links). My chain is a KMC x9 114 links, the new cassette is a SunRace 11-40t 9 speed and the new derailleur is a Shimano Alivio long cage RD-M3100. I have previously run the same chain and cassette on the bike without issue, the derailleur I previously ran was an Shimano Altus long cage 9 speed ( the next model down in the range from Alivio ) with no issues
I have checked High/Low screws, gear selection is spot on, and have checked and tried different B screw adjustments, but no different. I have created a short video below with the bike on the work stand, where I have attempted to replicate the noise when riding by applying the rear brake to simulate load (just spinning without load on bike stand doesn't show the issue)
Any ideas guys ? The new chain is lubed, the alignment looks OK (hanger not bent), I'm fresh out of ideas. The new Alivio derailleur is a slightly different design than the previous Altus one, in that there is a built in bit that drops down from the hanger, like a wolf tooth hanger adapter. I'm thinking the derailleur is the issue as the cassette/chain combo worked fine with the previous derailleur
I've replaced my chain, cassette and derailleur today and am now experiencing a chain flapping noise when riding. I checked the chain length using a calculator (114 links). My chain is a KMC x9 114 links, the new cassette is a SunRace 11-40t 9 speed and the new derailleur is a Shimano Alivio long cage RD-M3100. I have previously run the same chain and cassette on the bike without issue, the derailleur I previously ran was an Shimano Altus long cage 9 speed ( the next model down in the range from Alivio ) with no issues
I have checked High/Low screws, gear selection is spot on, and have checked and tried different B screw adjustments, but no different. I have created a short video below with the bike on the work stand, where I have attempted to replicate the noise when riding by applying the rear brake to simulate load (just spinning without load on bike stand doesn't show the issue)
Any ideas guys ? The new chain is lubed, the alignment looks OK (hanger not bent), I'm fresh out of ideas. The new Alivio derailleur is a slightly different design than the previous Altus one, in that there is a built in bit that drops down from the hanger, like a wolf tooth hanger adapter. I'm thinking the derailleur is the issue as the cassette/chain combo worked fine with the previous derailleur