HOT: Active* forum members generally gain 5% discount at starbike.com store!
Weight Weenies
* FAQ    * Search    * Trending Topics
* Login   * Register
HOME Listings Articles FAQ Contact About




Post new topic Reply to topic  [ 15 posts ] 
Author Message
 Post subject: ROTOR and Di2
PostPosted: Tue Oct 25, 2011 7:56 pm 
Offline
User avatar

Joined: Sun May 25, 2008 10:12 pm
Posts: 589
Location: italy
somebody are using ROTOR oval chainrings with Di2 groupset ?


hell or heaven ?

_________________
http://eliflap.it/


Top
 Profile  
 
 Post subject: Re: ROTOR and Di2
PostPosted: Wed Oct 26, 2011 1:09 pm 
Offline

Joined: Sat Dec 13, 2003 2:25 am
Posts: 4448
Location: Canada
I tried that. I run an SRM crank and am now 'testing' a DA 7950 SRM, so went back to the stock round rings.

The Di2 front derailleur is very powerful. It is so powerful that it flexes the stock 7900 and 7950 rings. If you are just testing it on the stand and don't pedal, it will flex the Q-rings so far, you'd think they'd snap! Obviously, they won't, but the derailleur is really powerful. While riding, this effect is not noticeable.

I think the stock Shimano rings shift better, but Di2 doesn't care what rings you put on it. It will shift anything in any condition. I have friends who are racing with Osymetric rings and completely trust Di2.


Top
 Profile  
 
 Post subject: Re: ROTOR and Di2
Posted: Wed Oct 26, 2011 1:09 pm 


Top
  
 
 Post subject: Re: ROTOR and Di2
PostPosted: Wed Oct 26, 2011 1:30 pm 
Offline

Joined: Fri Oct 17, 2008 9:37 am
Posts: 345
The same servo type Shimano use for their deep sea fishing reel to hurl in 100 kg monster. 30 years of experience.... What do u think? I think Di2 shift rotor Q rings better than SRAM, 7900 or even campy SR11, Record or Chorus if that matters. I uses only the Aero Q rings as its stiffer, seems to take the pressure of Di2 better, therefore shift faster.

But the fact nothing shift better than Shimano chainrings..


Top
 Profile  
 
 Post subject: Re: ROTOR and Di2
PostPosted: Wed Oct 26, 2011 1:53 pm 
Offline
User avatar

Joined: Sun May 25, 2008 10:12 pm
Posts: 589
Location: italy
i have to search a pair of compact rings , so ....

thanks :beerchug:

_________________
http://eliflap.it/


Top
 Profile  
 
 Post subject: Re: ROTOR and Di2
PostPosted: Wed Oct 26, 2011 2:01 pm 
Offline

Joined: Fri Oct 17, 2008 9:37 am
Posts: 345
There are Q-rings in Aero compact configuration. Ive installed these on all my friends bike: 54/42, 52/38, compact 50/36, 50/38. All are using Aero outer rings


Top
 Profile  
 
 Post subject: Re: ROTOR and Di2
PostPosted: Wed Oct 26, 2011 5:14 pm 
Offline

Joined: Mon Jan 24, 2005 9:41 pm
Posts: 723
Location: Uppsala, Sweden
maxima wrote:
The same servo type Shimano use for their deep sea fishing reel to hurl in 100 kg monster. 30 years of experience.... What do u think? I think Di2 shift rotor Q rings better than SRAM, 7900 or even campy SR11, Record or Chorus if that matters. I uses only the Aero Q rings as its stiffer, seems to take the pressure of Di2 better, therefore shift faster.

But the fact nothing shift better than Shimano chainrings..


thats why i used the aero version of q-rings, had no problem with di2 and aero q-rings


Top
 Profile  
 
 Post subject: Re: ROTOR and Di2
PostPosted: Wed Oct 26, 2011 6:46 pm 
Offline
User avatar

Joined: Sat Jun 12, 2004 8:49 am
Posts: 2080
Location: Denmark
Using Di2 with Aero Q-rings for this season. Works very well.


Top
 Profile  
 
 Post subject: Re: ROTOR and Di2
PostPosted: Wed Oct 26, 2011 8:04 pm 
Offline
User avatar

Joined: Sun May 25, 2008 10:12 pm
Posts: 589
Location: italy
we can say "heaven not hell " to my question at post #1 :thumbup:

_________________
http://eliflap.it/


Top
 Profile  
 
 Post subject: Re: ROTOR and Di2
PostPosted: Fri Mar 28, 2014 10:58 am 
Offline

Joined: Sat Apr 26, 2008 4:14 pm
Posts: 82
Location: Stockholm, Sweden
For me it’s mostly hell at the moment.

Finished my build yesterday and I´m really struggling with front shifting. Shifting from small to big is slow and on the top 3 cogs it will not go from small to big at all (OK, you should not cross chain but the Di2 adjustment mode is in big-big combination). I have followed the setup instructions from Shimano dealer manual step by step. I have understood that my setup will not be as good as with Shimano crank set but this bad? :?

Setup
Cervelo S5
Ultegra 6870 Di2 (with Rotor chain catcher)
Rotor 3D30 cranks and Rotor Aero Q-Rings 50t/38t
Ultegra 6800 12-25 cassette, 6800 chain with KMC 11spd Missing Link

What I´ve done/checked
FD parallel to chainring
1mm distance from max diameter of chainring to FD
Di2 adjustment move as far “out” as possible (all 12 clicks)
Low stop ~1mm to chain
High stop ~1mm to chain
FD support bolt touching the frame, but lightly. Otherwise rear end of FD cage starts moving outwards when tightening bolt.

Questions/thoughts
Will setting high stop further out increase the “throw” of the FD helping the chain onto big, or only increase risk of dropping chain over the top.
Will buying Rotor shims to rotate the FD (anti clockwise viewed from the side) help this issue? AFAIK, the main use for the shims is when chain touches bottom of FD cage, no such problem for me.
As a side note, after installing chain before any adjustment the FD worked badly. When doing first adjustment it stopped shifting from small to big at all, I took me nearly an hour to get it back to “bad”.

Any help is greatly appreciated. Sorry for the small essay 


Top
 Profile  
 
 Post subject: Re: ROTOR and Di2
PostPosted: Fri Mar 28, 2014 12:06 pm 
Offline

Joined: Fri Jan 27, 2006 1:38 pm
Posts: 570
Location: Greater Pittsburgh
I'm using 52/36 aero Q-rings on my tri bike with Di2. Shifts perfectly! You will need to play with derailleur height and it's very sensitive to cage angle. If all else fails, call Rotor customer service, they will help you and will probably already have a documented solution for your bike brand/model. In some instances, you will need to add an angled spacer to move the derailleur back and rotate the cage back/down; Rotor will be able to offer you the right spacer if needed.

_________________
"Suddenly the thought struck me; my floor is someone elses ceiling" - Nils Ferlin


Top
 Profile  
 
 Post subject: Re: ROTOR and Di2
PostPosted: Fri Mar 28, 2014 1:16 pm 
Offline

Joined: Mon Apr 23, 2012 10:21 pm
Posts: 165
Location: London, UK
ill principe wrote:
What I´ve done/checked
FD parallel to chainring
1mm distance from max diameter of chainring to FD
Di2 adjustment move as far “out” as possible (all 12 clicks)
Low stop ~1mm to chain
High stop ~1mm to chain

FD support bolt touching the frame, but lightly. Otherwise rear end of FD cage starts moving outwards when tightening bolt.


Weird, for mechanical groupsets the manuals state 0-0.5mm of clearance. Got a link to the tech doc pdf you're using?


Top
 Profile  
 
 Post subject: Re: ROTOR and Di2
PostPosted: Fri Mar 28, 2014 1:38 pm 
Offline

Joined: Sat Apr 26, 2008 4:14 pm
Posts: 82
Location: Stockholm, Sweden
You are correct, the manual says 0-0.5mm. It´s probably that close already. From what I´ve read during the day revisiting this and make sure the FD support bolt is "supporting enough" will be my first steps when I get home.

@audiojan´s tip about contacting Rotor is handy when I´m ready to throw the bike out and spend the summer on my winter cross with Shimano 5700 (which shifts pefectly...).


Top
 Profile  
 
 Post subject: Re: ROTOR and Di2
PostPosted: Fri Mar 28, 2014 1:41 pm 
Offline

Joined: Mon Jan 24, 2011 8:09 pm
Posts: 698
Yep, using Regular (non-aero) QRings with 9070 Di2...works like a charm. Always did with SRAM Red also.

I don't go by any specs from a manual, just put the FD barely enough to ensure the largest cog on the Big Ring at the largest point of the oval of the Rotor doesn't touch. That works out to maybe .5mm, whatever so when the derailleur moves to the left, it will never touch that largest tooth.

I also run a chain catcher...doesn't matter where that is, just close enough so not to touch the chain when on the small cog of course and to do its job in case. But never had it drop personally.

FD support screw touching the frame so the FD just starts to move outward when you tighten it. I use the metal/adhesive piece on my frame they provide for the Di2. That should give enough support so not to affect the frame/carbon, and so when force is applied, the cage moves immediately with no hesistation. Doesn't hurt to adjust that screw so when you tighten it, it actually just starts to move .1mm so you know the force/play is removed.

Rule of thumb, I NEVER run on the big ring and 1st-2nd on the rear, cross chaining obviously, badly. Asking for trouble. Closest I get ever is the 3rd cog/big ring.

Same with the small/small combo. Small ring, never go past about the 6th-7th on the rear, again, bad cross chaining habits. No surprise it wouldn't shift worth crap if you try this. Mine will do what you say also if I'm doing that, it won't shift, or is real slow to then move with the auto trim it does especially with 11spd due to the wider cassette spacing compared to 10spd.

If you are running the big ring, and need to be on the smallest 1-2, you need a different cassette tooth setup, or you need to drop to the small ring.

I consider myself a sprinter, there hasn't ever been a problem on my Scott Foil with SRAM/Di2 shifting. 52-39T front rings. When my rings wear out, I'm considering trying the Aero rings to get some extra stiffness, but I've never noticed anything flexing and causing issues at 1200w.


Top
 Profile  
 
 Post subject: Re: ROTOR and Di2
PostPosted: Fri Mar 28, 2014 10:14 pm 
Offline

Joined: Sat Apr 26, 2008 4:14 pm
Posts: 82
Location: Stockholm, Sweden
Had another go today and the shift is now ok, will ride the bike to get "real world" experience and not just in the work stand before working any more on the setup.

What I did was adjust the FD alignment, found small room for improvement, including an extra half turn on the support bolt. Then Zigmeisters tip on ~0.5mm from FD to closest tooth. Finally outer limit had to be about 1mm from chain.

Thanks for all the feedback!


Top
 Profile  
 
 Post subject: Re: ROTOR and Di2
Posted: Fri Mar 28, 2014 10:14 pm 


Top
  
 
 Post subject: Re: ROTOR and Di2
PostPosted: Sun Mar 30, 2014 2:16 am 
Offline

Joined: Wed Feb 19, 2014 6:13 am
Posts: 36
Outer limit further away than normal will help significantly, especially since oval rings shift like crap compared to standard shimano rings...
Remember the di2 front derailleur doesn't shift all at once, so allowing that limit to be looser than usual (1-2mm instead of .5) shouldn't cause dropped chains, as it doesn't take full advantage of that until after the shift is finished...


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 15 posts ] 


Who is online

Users browsing this forum: Bing [Bot], Ekorre, Google Adsense [Bot] and 45 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  

   Similar Topics   Author   Replies   Views   Last post 
There are no new unread posts for this topic. Rotor Flow vs Rotor 3D+ 2014

in Road

IchDien

9

2107

Tue Jul 15, 2014 3:21 pm

nd2rc View the latest post

There are no new unread posts for this topic. Rotor 3DF 52/36 To 50/34

in Road

ramchip

2

809

Tue Sep 03, 2013 1:13 pm

NiFTY View the latest post

There are no new unread posts for this topic. Rotor 3DF and 3D+

in Road

AMoon

1

305

Wed Aug 06, 2014 3:36 pm

rijndael View the latest post

There are no new unread posts for this topic. Rotor 3D+ Help

in Road

crashoveroid

3

519

Fri Jun 20, 2014 7:41 pm

CXTony View the latest post

There are no new unread posts for this topic. Would you go Rotor 3D or 3DF/+ ?

in Road

davidalone

3

785

Tue Feb 25, 2014 12:07 am

wpccrunner View the latest post


It is currently Sat Aug 23, 2014 7:16 am

All times are UTC + 1 hour




Advertising   –  FAQ   –  Contact   –  Convert   –  About

© Weight Weenies 2000-2013
hosted by starbike.com


How to get rid of these ads? Just register!


Powered by phpBB