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Thread: Ever seen a Shimano cassette with a bad cog?

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    Default Ever seen a Shimano cassette with a bad cog?

    Has anyone ever seen a Shimano cassette with a bad cog from the factory?
    I have a new-ish cassette. 8000 11 speed 11-34.
    The 3rd cog (a 27 tooth), makes crazy noise.
    I have tested it on multiple bikes, different chains, different adjustments- No way to make it run quiet.
     

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    Default Re: Ever seen a Shimano cassette with a bad cog?

    What's it sound like and have you checked the chain for wear?

    BTW Nope, never seen a bad cog from Shimano...Campy...SRAM (except for that Red junk)
    Last edited by Too Tall; 05-14-2019 at 08:13 PM.

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    Default Re: Ever seen a Shimano cassette with a bad cog?

    Different chains and even different bikes- This started even with a new chain.

    Quote Originally Posted by Too Tall View Post
    What's it sound like and have you checked the chain for wear?

    BTW Nope, never seen a bad cog from Shimano...Campy...SRAM (except for that Red junk)
     

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    Default Re: Ever seen a Shimano cassette with a bad cog?

    WHa! Yep. I have the same cassette on a bike currently with an issue. Mine is the fourth up from the smallest. Not sure what that makes the tooth count. Mine shifts up over the cog going up, drops off the cog going down - ie, consistently misses the shift to that cog. Warranty!

    And...I’ve seen multiple bad cassettes from Shimano and SRAM. Never from Campy, but my sample size is a lot smaller there. Remember the first-gen DA9k cassettes that all broke? Or the second-gen that all creak? I have a Red cassette on one bike that has a bad cog somewhere (but I can’t remember where) and doesn’t shift right (and I can count at least one other in recent memory). And don’t get me started on Eagle... Eagle is the best thing that ever happened to MTBs, but it still sucks.

    I think the problem with bikes these days is that everything is so damn good we expect perfection everywhere. I know I do, despite intense expectation management.
     

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    Default Re: Ever seen a Shimano cassette with a bad cog?

    Iíve seen some of the 11 speed stuff have an issue that seems like the tabs on the spider are too thin at one point which causes the chains plates to rub on the cog next to it.
     

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    Default Re: Ever seen a Shimano cassette with a bad cog?

    Cracked spacer, wrong spacer, etc. I had a Campy cassette that had the wrong spacer in one position new out of the box. But yes, also bad cog in a Shimano cassette. Almost like it was out of phase with the other cogs?

    Can also happen if you have a freehub with a burr or gouge that holds specific cog slightly cockeyed or effectively increases size of spacer.
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    Default Re: Ever seen a Shimano cassette with a bad cog?

    Quote Originally Posted by j44ke View Post
    Can also happen if you have a freehub with a burr or gouge that holds specific cog slightly cockeyed or effectively increases size of spacer.
    Huh. Thatís a good one. Never thought of it, but yeah: if a cog got pulled into the gouge, the shift ramps could sit 5į or more out of time.
     

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    Default Re: Ever seen a Shimano cassette with a bad cog?

    I had an 11-34 Shimano cassette that was noisy only in the fourth smallest cog. I couldn't make it quiet no matter what I tried, neither could the mechanic. I switched to a sub-compact 48/32 crankset and an 11-32 cassette, and it was quiet again.
     

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    Default Re: Ever seen a Shimano cassette with a bad cog?

    I warrantied my cassette through Shimano- I will try the new one out on Friday or Saturday and see.
     

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    Default Re: Ever seen a Shimano cassette with a bad cog?

    Received new 11-34 8000 cassette from warranty- No noise at all on this one!
     

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    Default Re: Ever seen a Shimano cassette with a bad cog?

    Not surprising--Shimano's warranty help is excellent. Spoils me for the rest of the bike industry, which spoils me for all the other things I don't work with!
    Quote Originally Posted by boots2000 View Post
    Received new 11-34 8000 cassette from warranty- No noise at all on this one!
     

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    Default Re: Ever seen a Shimano cassette with a bad cog?

    I have the same problem on my 11-34 as well.

    May have to call Shimano

    M
     

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