Shimano 9000 Cassette CARBON?

[dvs cycles]

Shimano 9000 cassette, 12/25, less than 10K miles.
Torque to spec always. Keep chains clean and change before they are past the 75% mark on the Park chain checker and usually get a lot of miles from my cassettes.
Today got some skipping with a new chain but only on the 18-19-21 combo.
Combined when no real power used with a surging feeling in my pedal stroke.
Reminded me of Bio-Pace from long ago.
Turns out the CARBON carrier they attach the 3 cogs to had broken at 3 of the 4 rivets allowing then to kind of fan out ecentrically.
What were they thinking?:no:

[Highpowernut]

I have heard of this, I'm curious as I have a da9k 12/25.
I ponied up the dough for the da cassette , and start hearing problems.
I realize that they wear out, what should one expect for mileage?

[John H.]

I did same thing- much less than 10k, maybe like 2k.
Shimano gave me a new one.

[oldpotatoe]

Shimano 9000 cassette, 12/25, less than 10K miles.
Torque to spec always. Keep chains clean and change before they are past the 75% mark on the Park chain checker and usually get a lot of miles from my cassettes.
Today got some skipping with a new chain but only on the 18-19-21 combo.
Combined when no real power used with a surging feeling in my pedal stroke.
Reminded me of Bio-Pace from long ago.
Turns out the CARBON carrier they attach the 3 cogs to had broken at 2 of the 3 rivets allowing then to kind of fan out ecentrically.
What were they thinking?:no:

Fairly common with first gen ones..supposedly a running change for a more burley one..warranty...

[saab2000]

Problem is that the 9000 cassettes are the ones with 12-tooth small cogs. Too many cassettes these days use 11-tooth cogs, which is useless to me and most other riders.

I got a bike last year with 9000 on it and got a 9000 12-28 cassette, which is a nice range. It better not be broken yet... I doubt the bike has 500 miles on it.

[cfox]

I have probably 3k on one, no problems. I bought a spare Ultegra assuming it would have an aluminum carrier. Nope; carbon just like DA. Not sure about 105 11 speed, but I doubt it will have a carbon carrier.

[bluesea]

Problem is that the 9000 cassettes are the ones with 12-tooth small cogs. Too many cassettes these days use 11-tooth cogs, which is useless to me and most other riders.

I got a bike last year with 9000 on it and got a 9000 12-28 cassette, which is a nice range. It better not be broken yet... I doubt the bike has 500 miles on it.


I wrestled with switching to 9000/6800 cassettes, but it looks like 6800 does not have either a 12-28 or 12-27. I find Campy's 12-29 more useful than 6800
11-28.

[Highpowernut]

Fairly common with first gen ones..supposedly a running change for a more burley one..warranty...


When was the change, or how can one check ?

[oldpotatoe]

When was the change, or how can one check ?

I don't think you can and if it isn't broken, no warranty.

[dvs cycles]

I did same thing- much less than 10k, maybe like 2k.
Shimano gave me a new one.
Did you deal with Shimano direct or thru a LBS?
I'm just down the road from Shimano central.

[dvs cycles]

I have probably 3k on one, no problems. I bought a spare Ultegra assuming it would have an aluminum carrier. Nope; carbon just like DA. Not sure about 105 11 speed, but I doubt it will have a carbon carrier.
Spoke with a club member this morning who had the same issue but no as severe as mine.
He said the 6800 cogs are attached with 6 rivets instead of the 4 on the 9000.

[yoshirider]

This has been discussed extensively on other forums. The amount of people complaining about the poor design led me to purchase a SRAM Red 22 XG-1190 11-28 cassette (supposedly quieter too) over the DA9000 and Ultegra 6800 for my new Di2 build. I just got the cassette in the mail yesterday and it came in on my scale at 167g so I saved a few grams too.

[John H.]

Sent back through a Shimano dealer.

Did you deal with Shimano direct or thru a LBS?
I'm just down the road from Shimano central.

[Louis]

Fairly common with first gen ones..supposedly a running change for a more burley one...

I'm always amazed by stuff like this. A company the size and with the smarts of a place like Shimano ought to be able to do enough realistic pre-production testing to prevent essentially all occurrences of this type of failure.

[rwsaunders]

I'm always amazed by stuff like this. A company the size and with the smarts of a place like Shimano ought to be able to do enough realistic pre-production testing to prevent essentially all occurrences of this type of failure.

Tell that to the battery engineers at Boeing...

[Louis]

Tell that to the battery engineers at Boeing...

Yeah, they paid for that screw-up many times over.

[oldpotatoe]

I'm always amazed by stuff like this. A company the size and with the smarts of a place like Shimano ought to be able to do enough realistic pre-production testing to prevent essentially all occurrences of this type of failure.

They relearn that aluminum works well for them, carbon is not something they are that familiar with. I am surprised they did somewhere you can't even see but shimano has never been about 'oooo, look at me' type stuff..much more subtle.

[Rusty Luggs]

Fairly common with first gen ones..supposedly a running change for a more burley one..warranty...

………….but, had this been SRAM instead of Shimano, it would have been yet more evidence of how SRAM is junk and how they use their customers as product testers, blah, blah, blah……, right?

[oldpotatoe]

………….but, had this been SRAM instead of Shimano, it would have been yet more evidence of how SRAM is junk and how they use their customers as product testers, blah, blah, blah……, right?

Right...

[bfd]

They relearn that aluminum works well for them, carbon is not something they are that familiar with.

Actually, in an old Rivendell Reader interview with Shimano CEO Kozo (?) Shimano, he stated that Shimano was very experienced with carbon....from their fishing side! But, at that time, Shimano engineers felt lightweight aluminum was a better material for cycling.

This is shown a few years back when Shimano came out with a limited carbon crank (fc-7800c). At about 710g it was slightly lighter than the aluminum version (fc-7800 @ 740g)....Also, aren't the current STI levers carbon? Good Luck! :eek::butt::no: