Anyone else having problems with XTR M980 cassettes? I've had two of the 11-36 cassettes and seem to have issues with the pins on the Ti cog carriers coming loose, primarily the carrier that the 24 and 28t are pinned to. For reference I race cat 1 XC and weigh ~180 pounds.
After using the cassette exclusively on my race bike for ~1 year I replaced it with another M980 11-36. When removing the worn out cassette I noticed that the pins holding the 24 and 28t to the carrier were loose. Since it was worn out I didn't think much of it and just thought it was a fluke. After replacing the cassette with another I was having great luck with it until this weekend. I was going up a very steep punchy climb and was putting a LOT of power into the pedals. About halfway through the steep climb I heard a CRACK and my leg/quad slammed into my bar/stem, only thing I could think is the chain snapped. After I got off and walked to the top of the climb I found that 1/4 of a Ti cog literally fell out, leaving the other 3/4 of the cog hanging by the single remaining pin. When I removed the cassette from my freehub I found that the pins had completely popped out and were loose in between the carriers/cogs/etc.
The cassette wasn't very worn since it was replaced about 2/3 of the way through last year's race season and only used on my race bike. Now I'm out a $300 cassette and have a gigantic bruise on my quad (I'm lucky that's all that happened).
I'm trying to decide how hard I should push my LBS to get shimano to warranty the cassette. I already had to replace it with an XT cassette since it could be awhile before shimano sees it. The XT cassette seems stronger/more rigid due to the steel cogs and more rigid carrier since 3 cogs are pinned to each carrier. If it's that much stronger/more durable I don't have a huge problem with the ~60 gram weight penalty. At this point I'm not sure I'll use the 980 cassette if they do provide a warranty replacement since I've lost faith in the durability for stronger riders.
Just trying to get a feel for if this is a more common problem than shimano would like to admit. Anyone with experience?
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Thread: XTR M980 Cassette Issues
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