Senior Member
Join Date: Jun 2014
Location: Ontario, Canada
Posts: 4,624
Bikes: iele Latina, Miele Suprema, Miele Uno LS, Miele Miele Beta, MMTB, Bianchi Model Unknown, Fiori Venezia, Fiori Napoli, VeloSport Adamas AX
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If you've taken the chain apart and then pushed a rivet back in, get a new chain for sure as a 9-speed chain rivet is flush with the outside plates and pushing one partway out with a chain tool and then pushing the rivet back in with a chain tool makes for a VERY WEAK joint there. 9-speed chains should be joined either with the special Shimano pin (if a Shimano chain) or much better in my opinion, with a quick-link.
A chain that breaks under load can cause a nasty spill and you don't want that to happen in traffic or in an intersection.
Cheers