Dura Ace 9000 Front Mech Rubbing - Hair being pulled out now

Discuss light weight issues concerning road bikes & parts.
are
Posts: 130
Joined: Fri Sep 05, 2008 1:15 am
Location: Los Angeles

by are

Maybe the shifter is moving on the bars? Same effect as wrong cable tension, but maybe harder to notice if the movement is very slight and only when you push/pull on it. Seems unlikely, but it happened to me once. Of course you'd also likely notice it in your braking.

by Weenie


User avatar
Cheers!
Posts: 1423
Joined: Sat Aug 05, 2006 2:29 am
Location: Mountain View, California
Contact:

by Cheers!

Agreed on the comment about shifter moving on bars. Happened to me the 1st time I installed Sram Red (1st gen) onto my bike that I had Dura-Ace 7800 back in the day.

I never really had to put high amounts of torque to the clamp for the shifter with Dura-Ace. So I did the same with Sram, it would slip down as I rode on the hoods. Took me weeks to figure it out, and now I torque the sram red hoods to recommended torque (pretty high) and no more ghost shifts in the back and no more rubbing front derailleur.

User avatar
mlchang
Posts: 142
Joined: Tue Dec 15, 2009 3:09 pm

by mlchang

One other thing I thought of is that there is an extra trim position on the small ring. The instructions for setting up limits and cable tension for the FD are not quite the same as old Shimano FDs. I would double check the dealer manual for the FD and shifters to be sure that you are setting it up correctly again. Though your mechanic may be awesome, the FD setup is a little different and maybe they didn't realize that.

durianrider
Posts: 73
Joined: Wed Jun 02, 2010 7:00 am

by durianrider

Ive got 2 bikes in the shed running DA9000 mech. I pulled out a bit of hair before I worked out: THERE IS EXTRA TRIM IN THE SHIFT!

So there was only 2 trims in the past on shimano FD's. With DA9000 there is THREE!

So when you are in the easiest gear, front and back, and its rubbing, trim the shifter one more time.
My YT channel
http://www.youtube.com/user/durianriders?feature=mhee" onclick="window.open(this.href);return false;" onclick="window.open(this.href);return false;


Follow me on Strava
http://app.strava.com/athletes/254600

CerveloMikey
Posts: 80
Joined: Tue Sep 16, 2008 11:20 pm
Location: Burbank, CA

by CerveloMikey

Did you ever solve your problem? I have the same exact issue with DA 9070. It can't be the trim because the dérailleur is auto-trimming. I think it is the chain. I am about to test my theory and swap it out with a KMC or Ultegra.
R2.5 / R3 / S-Works 29er (20 lbs) / S-Works SL4 Di2 (14.7 lbs)

User avatar
ms6073
Posts: 2371
Joined: Fri Jul 23, 2004 8:24 pm
Location: Houston, Texas

by ms6073

Is the rub when using the big or small chainring? When I moved our DA 9000 over to 9070 drive trains, setup was not difficult, but I found I really needed to pay close attention to the setup instructions provided in the Shimano 9070 Dealer Manual as some tolerances are less than 1mm which can make a difference with the front derailleur alignment/trim.
Michael - The Anaerobic Threshold is neither...

CerveloMikey
Posts: 80
Joined: Tue Sep 16, 2008 11:20 pm
Location: Burbank, CA

by CerveloMikey

ms6073 wrote:Is the rub when using the big or small chainring? When I moved our DA 9000 over to 9070 drive trains, setup was not difficult, but I found I really needed to pay close attention to the setup instructions provided in the Shimano 9070 Dealer Manual as some tolerances are less than 1mm which can make a difference with the front derailleur alignment/trim.


It is on the big chain rig. Same situation,quiet on the stand and noise in certain gears on the cassette. I have tried every adjustment possible. I don't understand how it could drag on both sides of the cage depending on the rear gear. It should auto-trim in or out for the corresponding rear gear
R2.5 / R3 / S-Works 29er (20 lbs) / S-Works SL4 Di2 (14.7 lbs)

Post Reply
  • Similar Topics
    Replies
    Views
    Last post