in

Compact w Rotor chain catcher = fail

Last post 06-14-2012 5:40 PM by kpbergma. 9 replies.
Page 1 of 1 (10 items)
Sort Posts: Previous Next
  • 06-13-2012 10:52 PM

    • SeanH
    • Top 200 Contributor
    • Joined on 08-12-2011
    • Oakville, ON
    • Posts 89

    Compact w Rotor chain catcher = fail

    Because of Q rings I've always used rotor chain catcher. However, I was still dropping chain once every few rides. Although this was annoyance, dropped chain has never scratched the frame and I've always thought the chain catcher stopped the chain from harming my bike. That is until last Sunday. I was cruising along at 20kph with very light torque on the pedal and the chain was dropped again, but this time the chain was jammed between the chain ring and the frame and scratched my beautiful S5 :( Once home, I started to inspect the chain catcher, trying to figure out why this device that was supposed to prevent chain from dropping wasn't functioning properly. The gap between the catcher and the ring was only 1mm, but upon closer inspection I've realized that the catcher wasn't parallel to the ring but rather come in at an angle. So the gap was more like V. Long story short, I've ditch the Rotor chain catcher and put on a k-Edge, adjusted it to be parallel to the chainring. I've went through some very wonky shifting to drop the chain on purpose and voila! K-Edge actually "catches" the chain and the chain is back on the ring. All this time I thought the chain catcher was just there to minimize the damage to the frame once the chain is dropped. I believe K-Edge works because 1) it has wider profile over Rotor and 2) you can fine tune the angle because it has wide bolt hole. Only two negatives with K-edge are that it's heavier and a tad bit more costly compare to Rotor.
  • 06-14-2012 10:01 AM In reply to

    • racewatcher
    • Top 100 Contributor
    • Joined on 09-09-2011
    • Newfoundland and Labrador
    • Posts 189

    Re: Compact w Rotor chain catcher = fail

    I'm just curious as to why your bike is dropping the chain so often.  If the lower limit screw on your front derailleur is properly adjusted, a chain drop should be a very rare event. I haven't dropped a chain in two years.
    racewatcher
  • 06-14-2012 10:57 AM In reply to

    • SeanH
    • Top 200 Contributor
    • Joined on 08-12-2011
    • Oakville, ON
    • Posts 89

    Re: Compact w Rotor chain catcher = fail

    My situation has nothing to do with low limit because the chain gets sucked when shiftin up to larger ring.

    Q ring doesn't like to be shifted when its in the smaller radius, and ocassionally the chain gets sucked in.

  • 06-14-2012 12:36 PM In reply to

    Re: Compact w Rotor chain catcher = fail

     I've had problems with my Rotor compact crank throwing the chain.  I have a k-Edge chain catcher and I'm telling you the chain can still get jammed under it and then you are in a world of poo.  My BB is all scratched up already.  I think there is another thread on this.  The Rotor crank will wedge the chain in and jam it against your BB scratching the hell out of it.

    I have the scars to prove this.  Could have been better engineered.

    Don't follow me.... you won't make it.
  • 06-14-2012 1:22 PM In reply to

    • SSB
    • Top 50 Contributor
    • Joined on 08-13-2011
    • Posts 259

    Re: Compact w Rotor chain catcher = fail

    I believe what you're describing is chainsuck, if your problem occurs when the chain fails to fully dislodge from the small chainring when shifting to the large chainring. As you pedal, the chain gets sucked up and right into the frame from the bottom. It jams in there pretty tightly and screws up the paint. A chain catcher doesn't help though, it only help when moving from large to small chainring.
  • 06-14-2012 1:30 PM In reply to

    Re: Compact w Rotor chain catcher = fail

    SSB:
    I believe what you're describing is chainsuck, if your problem occurs when the chain fails to fully dislodge from the small chainring when shifting to the large chainring. As you pedal, the chain gets sucked up and right into the frame from the bottom. It jams in there pretty tightly and screws up the paint. A chain catcher doesn't help though, it only help when moving from large to small chainring.
     

     

    I have had both issues.  Jammed under the chain catcher AND sucked up into the frame bottom.

    Don't follow me.... you won't make it.
  • 06-14-2012 3:26 PM In reply to

    • SeanH
    • Top 200 Contributor
    • Joined on 08-12-2011
    • Oakville, ON
    • Posts 89

    Re: Compact w Rotor chain catcher = fail

    FML.

    I has such a love and hate relationship with Q rings.

    How the hell are the pros using Q rings if the shifting is this wonky?

  • 06-14-2012 5:36 PM In reply to

    I have never had a problem with mine the only time I did it was because I made a bad shift.....

    and I have had my Rotor Q rings for 3 years one drop.
  • 06-14-2012 5:39 PM In reply to

    • rmerka
    • Top 10 Contributor
    • Joined on 05-19-2012
    • Central Texas
    • Posts 942

    Re: Compact w Rotor chain catcher = fail

     I was having the same problem with my Q-rings with regards to the chainsuck.  It stopped when swapped out the SRAM bottom bracket for the one from Rotor.  I don't know if the bracket had anything to do with it as so many things are readjusted afterward but the it is quite different from the SRAM one.

    2012 R5

    2012 S5

    Join us for the FUN in May 16-18, 2014!!! --> www.beyondtheforum.com
  • 06-14-2012 5:40 PM In reply to

    Re: I have never had a problem with mine the only time I did it was because I made a bad shift.....

    I haven't had any problems with my compact Q-Rings. I had more chain suck with the Rival crankset that came with the bike.
Page 1 of 1 (10 items)
Copyright © 2007-2013 Cervélo Cycles Inc. All rights reserved.