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  1. #1
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    Rear Tire is rubbing against the front derailleur

    Hello, I have a 2005 cannondale prophet and I just bought a Panaracer 2.4 tire. For some reason the tire is rubbing against the Shimano Deore LX front derailleur. Any suggestions? I have enough clearance to go bigger on the rear tire but I do not know why it is rubbing against it. Any help would be greatly appreciated besides shaving down the side knubs. Thanks

  2. #2
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    Umm, huh?

    How is this possible? Pics?

  3. #3
    Senior Member sydney's Avatar
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    Quote Originally Posted by Harleyrider18
    Hello, I have a 2005 cannondale prophet and I just bought a Panaracer 2.4 tire. For some reason the tire is rubbing against the Shimano Deore LX front derailleur. Any suggestions? I have enough clearance to go bigger on the rear tire but I do not know why it is rubbing against it. Any help would be greatly appreciated besides shaving down the side knubs. Thanks
    If you did not have the problem with the previous tire, could one quess the 2.4 Panracer is too big?

  4. #4
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    The Bike comes with IRC Trailbear 2.25 tires. I wanted to go bigger so I borrowed the Panarancer 2.4 tires from my friend to see if they would fit. I wanted to try to go as big as 2.5 or 2.6 because I know I have the clearance but I didnt think the tire knubs would rub against the front derailleur. Is there a way to adjust the derailleur? Raise it a bit? I really do want to go bigger than 2.25 and there has to be a way.

    Ive never loaded pics so unfortunatly I can't do it. Just imagine the bike is on the ground and you are looking straight down onto the derailler. The inner right side is rubbing against the tire.

  5. #5
    Senior Member sydney's Avatar
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    Quote Originally Posted by Harleyrider18
    The Bike comes with IRC Trailbear 2.25 tires. I wanted to go bigger so I borrowed the Panarancer 2.4 tires from my friend to see if they would fit. I wanted to try to go as big as 2.5 or 2.6 because I know I have the clearance but I didnt think the tire knubs would rub against the front derailleur. Is there a way to adjust the derailleur? Raise it a bit? I really do want to go bigger than 2.25 and there has to be a way.

    Ive never loaded pics so unfortunatly I can't do it. Just imagine the bike is on the ground and you are looking straight down onto the derailler. The inner right side is rubbing against the tire.
    There is clearance and there is clearance. Chainstay clearance does not necessarily translate to to clearance elsewhere. Raising the FD a significant amount will hose shifting. Maybe the derailer is mal aligned laterally?

  6. #6
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    I figued out how to post pics..I hope this works...

  7. #7
    Sweetened with Splenda
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    I still can't imagine how the tire can rub on the derailleur without also rubbing on the chainstay... unless the derailleur is mounted REALLY crooked. Can you post a slightly larger photo that shows the stays as well, please?

  8. #8
    Senior Member sydney's Avatar
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    Quote Originally Posted by brokenrobot
    I still can't imagine how the tire can rub on the derailleur without also rubbing on the chainstay... unless the derailleur is mounted REALLY crooked.
    I've actually had it happen on a road bike with correct derailer and nothing crooked.

  9. #9
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    dish your wheel or go back to smaller tires. I had this happen when my bike was brand new in first gear only. The reason was that my wheel was dished to allow use of an 8 inch rotor so it pushed it too close to the derailler and it rubbed....very annoying doing 45 minute first gear climbs with a fart noise the whole time. I ditched the 8 inch rotor for a 6 and brought the wheel back to center and its good to go.

    Why do you want such big tires? Id go smaller then whats on my bike now if I wasnt such a ******...the weight on the tires seems to make a noticeable difference in climbing.

  10. #10
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    Quote Originally Posted by sydney
    I've actually had it happen on a road bike with correct derailer and nothing crooked.

    Huh. I believe you - but the stay geometry must have been significantly different than the bike I went out and stared at this morning, trying to figure out how this is possible... The inside edge of my FD's cage is outset from the inside edge of my chainstay by well over a centimeter.

  11. #11
    Senior Member sydney's Avatar
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    Quote Originally Posted by brokenrobot
    Huh. I believe you - but the stay geometry must have been significantly different than the bike I went out and stared at this morning, trying to figure out how this is possible... The inside edge of my FD's cage is outset from the inside edge of my chainstay by well over a centimeter.
    But actually, as I think about it, it wasn't the derailer cage,but the arm contacting the tire when the arm was in the down position when in the big ring. Case of very shhort chainstays and a Long derailer arm compared to some others. That frame doesn't like anyhing bigger than 23s no matter what.

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