Dura-Ace cassette cracked and sprocket snapped

[DCLane]

Son no. 2's been away on holiday with his bike. During the holiday a sprocket snapped, cracking the sprocket holder: Apparently it was in several pieces down the road as he went uphill, then down on the tarmac . Too much power? ... from a 53kg rider ... not a chance

It's a Dura-Ace 9000 cassette and it looks like the 19 tooth sprocket's gone, cracking the holder at the same time (at the bottom).

Has anyone else had this issue? It's only been on a few weeks, but was a lightly-used cassette on arrival. And I'm guessing I can use any 19/21/23 Shimano 11-speed cassette section to fit?

Oh, and please take every opportunity to note that his bike's dirty

 

[Regular.Cyclist]

Oh, and please take every opportunity to note that his bike's dirty

And upside down 😱

 

[Jameshow]

Titanium??

 

[faster]

This was common when these were current. The solution is to use something else. Ultegra, for instance, didn't have the same issue.

 

[Ripple]

My misfortune from 2018 ride. Dura Ace 9000. Snapped out of the blue - no steep uphill riding, simply wanted to change a gear and couldn't, stopped to look what's the reason - the reason was oops! Replaced with Shimano 105 cassette and no probs so far.

 

[DCLane]

@Ripple - this is exactly what's happened.

It's been replaced with an Ultegra 8000 cassette instead.

 

[StuAff]

He must have overdone the spinach…

A quick Googling suggests that DA9000 cassettes have issues, even after Shimano made changes during production. Never had anything like that happen to me with 105 or Ultegra (or Campagnolo).

 

[Jameshow]

https://weightweenies.starbike.com/...sid=196d2853c90d63f6cd82ccd47e09c56f&start=15

Deffo an issue.. pages of it on the fast guys forum.

I have some DA wheels which creak maybe I have a DA cassette but it's 10spd though?🤔🤔🤔

 

[Dogtrousers]

Hope your son is OK and doing better than his bike.

(Which is dirty, by the way)

 

[DCLane]

@Dogtrousers - thanks, and he was OK enough to ride the 19 miles back.

You'll be relieved to know the bike's now appropriately cleaned.

 

[Ajax Bay]

105 best till 18, David, with the occasional ride on a bike with down tube friction levers so he knows what he's missing. You're are spoiling him, maybe to avoid the accusation that you favour his older brother ("X has DA" etc).
I had the same problem with hockey sticks, bitd, and now look: she's found someone to provide her with DA everything and a Muc-off special 'just for the race'. 17 days and counting!

 

[DCLane]

@Ajax Bay - he's had some nice kit but you'd be surprised at the cost; i.e. the BeOne Raw above he trains on and has raced cost under £500 for him to build including getting the frame for £100 from someone who'd had a go and gave up. It's got a DA/Ultegra mix and carbon wheels. And he built it, not me. The only aspect has been sourcing parts very carefully.

In terms of brothers son no. 1 thinks cyclists are stupid; why ride for coffee and cake when you can have coffee and cake at home?

So maybe he's spoilt. But on a budget The only new bike in the last five years has been his team Ridley, otherwise it's been second-hand so if they get damaged it's not too much of an expense.

Oh, and he's taking both the orange 1975 Carlton Corsa fixie conversion plus a kid's converted Spesh Hotrock to university for commuting. No decent new commuter for him.

 

[fossyant]

He must have overdone the spinach…

A quick Googling suggests that DA9000 cassettes have issues, even after Shimano made changes during production. Never had anything like that happen to me with 105 or Ultegra (or Campagnolo).

You don't get that with DA 7400. All gone downhill since

 

[Jameshow]

@Ajax Bay - he's had some nice kit but you'd be surprised at the cost; i.e. the BeOne Raw he trains on and has raced cost under £500 for him to build including getting the frame for £100 from someone who'd had a go and gave up. It's got a DA/Ultegra mix and carbon wheels. And he built it, not me. The only aspect has been sourcing parts very carefully.

In terms of brothers son no. 1 thinks cyclists are stupid; why ride for coffee and cake when you can have coffee and cake at home?

So maybe he's spoilt. But on a budget The only new bike in the last five years has been his team Ridley, otherwise it's been second-hand so if they get damaged it's not too much of an expense.

Oh, and he's taking both the orange 1975 Carlton Corsa fixie conversion plus a kid's converted Spesh Hotrock to university for commuting. No decent new commuter for him.

Much like my focus izalco pro team frame from 2012 build up with 4700!🤣🤣🤣

Reynolds solitude wheels, flite saddle and Caron bars less than 8kg.