Q: How light is too light?

Discuss light weight issues concerning road bikes & parts.
mrlobber
Posts: 722
Joined: Sat Oct 23, 2010 9:36 am
Location: Where the permanent autumn is

by mrlobber

Wow, enough to put me off this cassette which was on the shopping list.

Were the smaller sprockets still rideable? When I broke the 3rd largest cog on a DA9000 cassette, I was able to get home since the cassette itself was still sitting on the freehub solidly.

by Weenie


User avatar
nickf
Posts: 591
Joined: Sat Mar 06, 2010 10:34 pm

by nickf

What's the rear carrier do? Is it not splined for the freehub body? Just a slip fit floating round ring or something?

Imaking20
Posts: 1597
Joined: Fri Nov 18, 2011 5:19 am

by Imaking20

I would not say the cassette was still rideable - and didn't even attempt. The carrier on the Uno is very different from Shimano, with the entire cassette being one piece (only the lockring is separate out of the box).

Yes, the rear carrier just floats around the splines. It does not engage any of them.

Image
Current:
T2

Retired:
Blue | Project C6.0 | Felt AR FRD | Colnago C59 NERO | 2014 S-Works Tarmac | S-Works Venge | Wilier Cento Uno SL | Tarmac SL2

User avatar
Kayrehn
Posts: 1084
Joined: Thu Mar 24, 2011 6:06 pm

by Kayrehn

Will be great if you can get Rotor's attention on this - maybe they might do a recall instead of doing a Shitmano move.

Sent from my SM-G930F using Tapatalk


FreaK
Posts: 844
Joined: Sat Aug 27, 2005 5:57 am
Location: mOntreal

by FreaK

If they just splined the aluminium section they'd probably be able to get away with that absurdly thin section bridge between cogs.
It also looks like the bridge is not quite low enough, looks like the chain is touching already.

Honestly, i can't imagine what their excuse was for not tieing that side to the freehub body. That's pretty ridiculous.
it's actually possible to come to the conclusion even before realising it makes no sense at all
-
tymon_tm

TobinHatesYou
Posts: 1693
Joined: Mon Jul 24, 2017 12:02 pm

by TobinHatesYou

That the dome itself failed is surprising...I wonder if this was truly a fluke / manufacturing defect.

Imaking20
Posts: 1597
Joined: Fri Nov 18, 2011 5:19 am

by Imaking20

I'm not sure I'd be willing to find out if this was just a fluke. I don't really feel there's a practical reason to not have the rear splined. How much weight could it add? There is potential for A LOT of force on a cassette (I was just rolling out of my driveway - imagine an uphill sprint!) and to rely on very little interaction with the freehub splines on the front and - I dunno, friction(?) - on the rear is nuts. Honestly, not even something I was really concerned with before purchasing. Installing, I got a little skeptical. 10 minutes later...
Current:
T2

Retired:
Blue | Project C6.0 | Felt AR FRD | Colnago C59 NERO | 2014 S-Works Tarmac | S-Works Venge | Wilier Cento Uno SL | Tarmac SL2

jeanjacques
Posts: 124
Joined: Thu Apr 14, 2016 11:01 am
Location: France

by jeanjacques

Imaking20, did you torque it enough ? 40nm is pretty high and friction spreads stress.

kode54
Posts: 1266
Joined: Tue May 23, 2006 9:39 pm

by kode54

pdlpsher1 wrote:
Sun May 06, 2018 12:58 am
I just read Shimano's response to the re-design of the DA cassette. Too funny. Japanese's way of doing business is to never admit fault. DA's cassette problem is well documented and yet they refuse to take blame. I find the following line quite funny...yeah, a creak is not a noise, lol.
Nick Murdick Shimano Lead Technical Instructor wrote:
Sat May 05, 2018 11:28 pm
Of course, if the joint between the carrier and the cog starts to fail it will make noise but that’s different from a creak.
my failure(s) on two cassettes happened where the mid group of cogs are riveted together. the rivets were sheared off with only one holding it...had bad shifting prior to failure and because of the missing rivets, the 16T cog snapped and broke in half.
- AX Lightness Vial EVO D + DA9150 + Enve SES 4.5 carbon hubs
- Parlee Altum + DA9150 + Enve SES 4.5 carbon hubs
- Parlee ESX + DA9150 + THM SRM PM + Enve SES 6.7 CK hubs
- Guru Praemio R Titanium + DA9150 + Enve 3.4 CK hubs

User avatar
Klaster_1
Posts: 368
Joined: Mon Aug 15, 2016 10:25 am
Location: Krasnoyarsk, Russia

by Klaster_1

Imaking20 wrote:
Mon May 07, 2018 3:47 pm
Yes, the rear carrier just floats around the splines. It does not engage any of them.
Can you tell if aluminium carrier is bolted or riveted to the steel part? If it's bolted, the design enables a cool DIY opportunity with right tools (i.e. a local chainring manufacturer with CNC) to fix the missing splines issue, extend the cassette range or even add an additional overhanging cog or two if you have a suitable shifter (custom indexed, XShifter-like or friction).

Imaking20
Posts: 1597
Joined: Fri Nov 18, 2011 5:19 am

by Imaking20

Rivets.
Current:
T2

Retired:
Blue | Project C6.0 | Felt AR FRD | Colnago C59 NERO | 2014 S-Works Tarmac | S-Works Venge | Wilier Cento Uno SL | Tarmac SL2

darnellrm
Posts: 227
Joined: Thu Sep 10, 2009 1:06 pm
Location: NC, USA

by darnellrm

They sure look like torx screws in your first pic.

Imaking20
Posts: 1597
Joined: Fri Nov 18, 2011 5:19 am

by Imaking20

Eh, you're right, it's torx.

Personally, trying to find someone to do that work - or even doing it myself if I had the resources - is not interesting for what is about the most expensive cassette on the market. It should work out of the box...
Current:
T2

Retired:
Blue | Project C6.0 | Felt AR FRD | Colnago C59 NERO | 2014 S-Works Tarmac | S-Works Venge | Wilier Cento Uno SL | Tarmac SL2

Post Reply
  • Similar Topics
    Replies
    Views
    Last post