Advertise on Bikeforums.net



User Tag List

Results 1 to 16 of 16
  1. #1
    Senior Member pyroguy_3's Avatar
    Join Date
    Oct 2005
    Location
    Blo-no, IL
    My Bikes
    2005 Specialized Hardrock Sport, 1970's Miyata Liberty ala fixed gear
    Posts
    557
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    front derailleur rubbing tire

    I know why I have this problem, went from a 2.2 to a 2.4 tire and the new bigger one has larger knobs, and therefore I cannot use the smallest chainring otherwise it rubs the tire. Is there a way to adjust the derailleur so that it does not rub the tire? can I either move the bracket down the seat tube to get it away from the knobs, or is there any other adjustment/modification that can be done?

  2. #2
    Senior Member Thrifty1's Avatar
    Join Date
    Jun 2005
    Location
    OK
    Posts
    780
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Possibly your "L" limit adjustment........

  3. #3
    Senior Member pyroguy_3's Avatar
    Join Date
    Oct 2005
    Location
    Blo-no, IL
    My Bikes
    2005 Specialized Hardrock Sport, 1970's Miyata Liberty ala fixed gear
    Posts
    557
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    If I didn't clarify enough, the part that is rubbing is the inside of the "tail" of the front deraileur. I think some selective hacksawing will do the trick, but I am hesitant to chop into my deraileur. If I had my full set of metal working tools it would be no problem, but I am at school... so no dice. Is there possibly a type of deraileur that is shorter than others? it's an 8 speed by the way.

  4. #4
    To be continued Dannihilator's Avatar
    Join Date
    Oct 2002
    Location
    Annandale, NJ.
    My Bikes
    2014 Surly Steamroller, 1977 Puch Pathfinder
    Posts
    19,072
    Mentioned
    25 Post(s)
    Tagged
    1 Thread(s)
    Rotate the deraillieur or run a narrower tire in the back.
    Strike like an eagle and sacrifice the dove.
    Words and Stuff.

  5. #5
    Senior Member pyroguy_3's Avatar
    Join Date
    Oct 2005
    Location
    Blo-no, IL
    My Bikes
    2005 Specialized Hardrock Sport, 1970's Miyata Liberty ala fixed gear
    Posts
    557
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Yeah, I found a similair post, with surprisingly the exact same tire I am having trouble with... 2.4 panaracer. Turns out if you spell derailleur deraileur, it doesn't come up. anyway, I'm going to try rotating the derailleur, on the seat stay I suppose? and if that doesn't work, I guess either put my old 2.2 on the back or get a smaller panaracer and just keep the extra 2.4 for a backup front tire. Or, I could try to find a shorter caged derailleur.

  6. #6
    To be continued Dannihilator's Avatar
    Join Date
    Oct 2002
    Location
    Annandale, NJ.
    My Bikes
    2014 Surly Steamroller, 1977 Puch Pathfinder
    Posts
    19,072
    Mentioned
    25 Post(s)
    Tagged
    1 Thread(s)
    No such thing as a short caged front deraillieur.

    May I ask what bike is this?
    Strike like an eagle and sacrifice the dove.
    Words and Stuff.

  7. #7
    Senior Member pyroguy_3's Avatar
    Join Date
    Oct 2005
    Location
    Blo-no, IL
    My Bikes
    2005 Specialized Hardrock Sport, 1970's Miyata Liberty ala fixed gear
    Posts
    557
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    07 hardrock sport. probably seems strange to have such aggresive tires, but I wash out so damn much on the trails I frequent I figured I'd try some beefier treads. There is really only about a quarter inch or so that is overlapping the tire knobs so if there are no cages that wouldn't hit, I'll try rotating and if that doesn't work, do some reconstructive surgery. I'm thinking cutting the end off the cage and putting a tube type spacer with a small bolt through it to become the closed end, in effect shortening the cage. I can't see any problems with this approach, any suggestions?

  8. #8
    To be continued Dannihilator's Avatar
    Join Date
    Oct 2002
    Location
    Annandale, NJ.
    My Bikes
    2014 Surly Steamroller, 1977 Puch Pathfinder
    Posts
    19,072
    Mentioned
    25 Post(s)
    Tagged
    1 Thread(s)
    Max tire width on the back for a hardrock is a 2.3 or a narrow 2.4. The panaracer 2.4 measures more like a 2.6.
    Strike like an eagle and sacrifice the dove.
    Words and Stuff.

  9. #9
    Official Website Waterboy born2bahick's Avatar
    Join Date
    Dec 2004
    My Bikes
    a lot
    Posts
    3,271
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by pyroguy_3 View Post
    07 hardrock sport. probably seems strange to have such aggresive tires, but I wash out so damn much on the trails I frequent I figured I'd try some beefier treads. There is really only about a quarter inch or so that is overlapping the tire knobs so if there are no cages that wouldn't hit, I'll try rotating and if that doesn't work, do some reconstructive surgery. I'm thinking cutting the end off the cage and putting a tube type spacer with a small bolt through it to become the closed end, in effect shortening the cage. I can't see any problems with this approach, any suggestions?
    This approach sounds intriquing! The only problem I see is if you cut it too short, it will act as a chain tensioner on the smallest front ring. It's definately not the recommended solution but if you like 2.4's, give it a try. front derailuers can be had pretty cheap!

  10. #10
    Senior Member pyroguy_3's Avatar
    Join Date
    Oct 2005
    Location
    Blo-no, IL
    My Bikes
    2005 Specialized Hardrock Sport, 1970's Miyata Liberty ala fixed gear
    Posts
    557
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I don't have to take too much off the cage to stop it from rubbing, but I think it will work. If it doesn't then oh well i'll just buy a cheap one to replace it and switch back to my orriginal tires. The purchase of the 2.4's was not intentional either, by the way. Kind of one of those what was I thinking, but my order is shipped already i'll just put them on, kind of things...

  11. #11
    Official Website Waterboy born2bahick's Avatar
    Join Date
    Dec 2004
    My Bikes
    a lot
    Posts
    3,271
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    You know the more I think about it, It would be trying to tension the chain on the side that has no give to it. It could be that the tension of the chain under acceleration, would pull the cage down anyway. Without seeing the setup it's really hard to guess.

  12. #12
    Senior Member pyroguy_3's Avatar
    Join Date
    Oct 2005
    Location
    Blo-no, IL
    My Bikes
    2005 Specialized Hardrock Sport, 1970's Miyata Liberty ala fixed gear
    Posts
    557
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    there is plenty of room to take off metal, but the way the cage is made, I can't run a bolt through to close the cage. I'm going to see if hacking off some corner material will do the trick. I have a feeling I'll just have to go back to a smaller tire on the rear which wont affect my washing out problem anyway, just less oomph when pedaling.

  13. #13
    Senior Member AlucardZero's Avatar
    Join Date
    Jun 2007
    Location
    OC, New York
    My Bikes
    Trek 4500, Mongoose MGX DXR(LOL)
    Posts
    307
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Instead of hacking things off, bend it with pliers...
    Trek 4500

  14. #14
    Senior Member Thrifty1's Avatar
    Join Date
    Jun 2005
    Location
    OK
    Posts
    780
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Please try all the proceedures in:
    http://www.parktool.com/repair/readhowto.asp?id=75

  15. #15
    Senior Member
    Join Date
    Aug 2007
    Posts
    511
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Try a SRAM gripshift for your front shifter. It allows you to trim out the derailleur and eliminate rub. SOOO ... if you NEED to push the derailleur cage that far down to get the chain to shift, you can then adjust the rub out of the system out of the shift.

    The other thing you can do is to dish the wheel off slightly to the non drive side. This of course assumes that you have some more room. A wheel off center to the non-drive side is actually stronger as it brings the spoke angles from either side closer together and hence their tension.

  16. #16
    Senior Member pyroguy_3's Avatar
    Join Date
    Oct 2005
    Location
    Blo-no, IL
    My Bikes
    2005 Specialized Hardrock Sport, 1970's Miyata Liberty ala fixed gear
    Posts
    557
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Please try all the proceedures in:
    http://www.parktool.com/repair/readhowto.asp?id=75
    thanks, but I prefer my copy of Zinn. I finally just said screw it, after finding that the metal it is made out of is so ridiculously hard that my hacksaw wouldn't even cut into it. Granted it is a strange angle to cut at, without removing the derailleur from the bike. so I slapped my old tire back on and am going to run that one bald then probably get the panaracer fire xc for the rear, so the colors match duuuh... Thanks a lot for all the helpful insight though!

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •