WizardOfBoz

Not sure if I should be proud (to break a cassette that pro riders use and - apparently - don't break), or bummed (as in I need a new cog or possibly a new cassette.

Has anyone else had this problem? Advice? Can I just buy the part, or do I need a new cassette?

Pic below.

HillRider

The photo didn't load so I don't know what you did but it's an interesting problem. DA cassettes have some Ti large cogs and is that what broke?

WizardOfBoz

Photolink should be working (I had to start using Google Photos, as Photobucket no longer serves photos remotely - your note got me before I had it figured out*).

I guess that the part is a Y1YC98060 - Sprocket Unit (19-21-23T) for 12-28T
Anyone know if/where I could bet one of these?

I'd like to be able to get riding again for, like, $25 or so, and avoid the $150 or so for a whole new cassette.

Thanks!

* I can now see the photo, if you can't, please let me know.

3alarmer 

.
...casettes are remarkably resistant to disassembly and repair. I think most, if not all, Shimano cassettes are interchangeable at this point. Dura Ace has been variable in the early years. Depending on the number of cogs in your cassette/freehub body, you shouild be able to get something in the plain Jane Sora lineup for about 20-30 bucks. Try Ribble, they have good prices.

Maybe before you order it, list exactly what it was in terms of year of manufacture and number of speeds, and some expert will tell you if I'm correct.

wschruba

Check with a shop that works with QBP (so, pretty much any of them). They sell replacement sections for Super Record, so it would make sense that they carry the same for Dura Ace.

(Also, there's a 3 year warranty on Dura Ace, so if you are in that period...)

trailflow1

Your not the first to have this happen. There is a known issue with early DA9000 cassettes.

https://www.bikerumor.com/2014/06/06...nate-creaking/

Dura Ace 9000 11 speed cassette- rubish product design - Weight Weenies

Shimano do not sell cassette clusters seperately.

The cheapest compatible replacement would be a 105 11spd cassette.

But if you make a warranty claim, Shimano or the retailer (your first port of call) should give you a replacement.

WizardOfBoz

It was on a 2014 Domane, so I think I'm on the edge for warranty. But what I'm hearing is that an Ultegra or Sora will fit, right? Good to know I can be back riding soon, without incurring a $150 cost for a whole new cassette.

If Shimano does come through (I can't believe that this would break like that under normal wear and tear), I'll let you all know. Thanks.

trailflow1

a Sora cassete wont fit because they are 8,9 spd only. And they have different cog spacing compared to 11spd.

Only 105 & Ultegra 11spd cassette are compatible from Shimano.

Sram PG-1130, PG-1170 & XG-1190 cassettes would also be compatibe.

TimothyH

Shimano 105 are $41 at backcountry.com. Ultegra are $51.

Either will work.

Backcountry gives free 2 day shipping on orders over $50 but if you call them and ask they will give you free two day shipping on anything.

1-877-550-2639 is their number.


-Tim-

dedhed

I would think if they have a part # you could get it. YOu can call them (800) 423-2420

cycledogg

I'm curious, did you clean those cogs before you posted the pic?

WizardOfBoz

Very summarily, after it was broken. I didn't think I needed to put the dead part in the Ultrasonic bath.

WizardOfBoz

I shipped the Cassette back to Irvine (Shimano America). We'll see. In the meantime, I ordered an Ultegra cassette through my trusty LBS. Should be here in a day or two. So I'll be able to ride, but may get back the new (that is, properly designed/constructed) Dura Ace cassette. I like Shimano stuff, and so I hope that they live up to my image of them. Will advise.

fietsbob

Drive train parts are Consumables buy a new chain and cassette and get on with your day.

cycledogg

The reason I ask is, the color of it looks odd. How old is it? Anyhow, I see you ordered a new Ultegra cassette. Get a new chain while your at it. Putting that much torque on a cassette to break it probley stretched the chain a bit.

trailangel

What a stud!
Buy SRAM steel and be done with this Aluminum/TI nonsense.

WizardOfBoz

Not to mention CF. The hub, or spider, is CF. The three cogs are riveted on, but there's only 4 rivets per cog. The new design expanded the tabs and uses two rivets.

Depending upon how the Ultegra cassette feels, I may stick with it. If Shimano does send me a new Dura Ace, I may try that. Time will tell. I will advise.

corrado33

Easy solution. Man up and stop using the largest cog.

CliffordK

Individual sprockets regularly show up on E-Bay. Keep an eye out.

Unfortunately Ultegra sprocket clusters are different than Dura Ace, and wouldn't be compatible.

WizardOfBoz

Hey! YOU drag my fat A$$ up that hill in high gear!

Seriously, though, this was not the largest cog. It was the 23, and the spider next to this one had a 25 and a 28.

Having said that, IIRC, I was actually taking your advice. I upshifted so I could stand up when the cog broke.

WizardOfBoz

So this is a different story than I've heard. Are you saying you can't replace a DA spider with the same spider from an Ultegra? I thought DA/Ultegra and 105 all fit the same freehub, no?

ExpertTools

As one can see from the posted photos, it's got way more damage than just the sprocket. The spider is broken as well. Since you sent it to Shimano, keep us posted as to how they respond. Definitely a new chain should be an automatic if you're replacing the cassette.


Just curious, are you a very big rider? If so, you may need to consider a steel cassette.

corrado33

Ah, I didn't count teeth!

I did check QBP for replacement sections of dura ace cassettes, no such luck. Honestly though, buying shimano stuff from there doesn't save any money. It's often cheaper at chain reaction or any of the UK based online bike stores. Seems counterintuitive, but biking stuff is just $$$$ in the US compared to the UK.

WizardOfBoz

Yeah, the rivets had ripped out of the CF spider.

I'm 6'2", 240lb, was a defensive end in college. Leg pressed 1000lbs back then! A long time ago. I'm fatter, but weaker. Still, I ordered an Ultegra. If I like that design I may stick with it.

Will advise on Shimano's verdict. Given all the negative reviews and people breaking 3 cassettes in the first three weeks they had a bike with the early DA CS-9000 design, I can't see how this isn't flawed design. But we shall see. And the Wizard shall report all.

CliffordK

You can replace the whole cassette.

But, generally not individual sprockets for the large sprockets (see note below).

Dura Ace CS-9000 & CS-9100
12-28: 12,13,14,15,16,17 (19-21-23) (25-28)

Ultegra CS-6800
11-28: 11,12,13,14,15,17 (19-21) (23-25-28)
12-25: 12,13,14,15,16,17 (18-19) (21-23-25)

I suppose there is an Ultegra 11-23:
11,12,13,14,15,16 (17-18) (19-21-23)

Anyway, the Dura Ace does a bunch of individual sprockets followed by a group of 3 and then a group of 2.
The Ultegra does a bunch of individual sprockets followed by a group of 2, then a group of 3.

So, I guess the 11-23 sprocket set from the Ultegra might fit on your Dura Ace cassette, but it may not shift perfectly. Hopfeully sprocket spacing would be ok.

So, here is the Ultegra 19-23... if you wanted to try it.
Shimano Ultegra CS-6800 19-21-23T Cog Unit for 11-23T 11 Speed Cassette | eBay