Crank/ chain stay clearance issues
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Crank/ chain stay clearance issues
Hi grouppe-
I’m a somewhat recently new road cyclist who has learned a lot from browsing the forums…Thanks. I recently purchased a used 2003 Cannondale R600 that has had its drivetrain upgraded to Dura-Ace 7700?…I think.
I bought a Cateye computer that has wireless speed and cadence. The unit has an “arm” for sensing speed and another one for sensing cadence. My problem is that when I mount the unit I do not have enough clearance between the outside of the chain stay (where the cadence transmitter mounts), and the inside of the left crank arm. I also need to attach the magnet to the crank arm which will make the clearance issue even worse. The clearance between the crank arm and the chain stay is about the width of a dime without anything mounted. Is this amount of clearance normal? There is a lot more space for the right side crank arm. I’m also having front derailleur issues as well. I have a triple. When shifting from the top chain ring it will only go to the smallest ring and not the middle. When shifting up, it works fine.
Is it possible that I could have an incorrect or misaligned bottom bracket causing these clearance and shifting problems?
Thanks in advance and sorry for the long post.
Steve
I’m a somewhat recently new road cyclist who has learned a lot from browsing the forums…Thanks. I recently purchased a used 2003 Cannondale R600 that has had its drivetrain upgraded to Dura-Ace 7700?…I think.
I bought a Cateye computer that has wireless speed and cadence. The unit has an “arm” for sensing speed and another one for sensing cadence. My problem is that when I mount the unit I do not have enough clearance between the outside of the chain stay (where the cadence transmitter mounts), and the inside of the left crank arm. I also need to attach the magnet to the crank arm which will make the clearance issue even worse. The clearance between the crank arm and the chain stay is about the width of a dime without anything mounted. Is this amount of clearance normal? There is a lot more space for the right side crank arm. I’m also having front derailleur issues as well. I have a triple. When shifting from the top chain ring it will only go to the smallest ring and not the middle. When shifting up, it works fine.
Is it possible that I could have an incorrect or misaligned bottom bracket causing these clearance and shifting problems?
Thanks in advance and sorry for the long post.
Steve
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Originally Posted by maxpsi
Hi grouppe-
I’m a somewhat recently new road cyclist who has learned a lot from browsing the forums…Thanks. I recently purchased a used 2003 Cannondale R600 that has had its drivetrain upgraded to Dura-Ace 7700?…I think.
I bought a Cateye computer that has wireless speed and cadence. The unit has an “arm” for sensing speed and another one for sensing cadence. My problem is that when I mount the unit I do not have enough clearance between the outside of the chain stay (where the cadence transmitter mounts), and the inside of the left crank arm. I also need to attach the magnet to the crank arm which will make the clearance issue even worse. The clearance between the crank arm and the chain stay is about the width of a dime without anything mounted. Is this amount of clearance normal? There is a lot more space for the right side crank arm. I’m also having front derailleur issues as well. I have a triple. When shifting from the top chain ring it will only go to the smallest ring and not the middle. When shifting up, it works fine.
Is it possible that I could have an incorrect or misaligned bottom bracket causing these clearance and shifting problems?
Thanks in advance and sorry for the long post.
Steve
I’m a somewhat recently new road cyclist who has learned a lot from browsing the forums…Thanks. I recently purchased a used 2003 Cannondale R600 that has had its drivetrain upgraded to Dura-Ace 7700?…I think.
I bought a Cateye computer that has wireless speed and cadence. The unit has an “arm” for sensing speed and another one for sensing cadence. My problem is that when I mount the unit I do not have enough clearance between the outside of the chain stay (where the cadence transmitter mounts), and the inside of the left crank arm. I also need to attach the magnet to the crank arm which will make the clearance issue even worse. The clearance between the crank arm and the chain stay is about the width of a dime without anything mounted. Is this amount of clearance normal? There is a lot more space for the right side crank arm. I’m also having front derailleur issues as well. I have a triple. When shifting from the top chain ring it will only go to the smallest ring and not the middle. When shifting up, it works fine.
Is it possible that I could have an incorrect or misaligned bottom bracket causing these clearance and shifting problems?
Thanks in advance and sorry for the long post.
Steve
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If your inner chainring clears the chainstay by more than a couple of mm, your BB may be mounted too far to the right. I am not familiar with the inner guts of DA, but both of my Campag. cartridge BBs have narrow shims which could be juggled to fine-tune the chainline.
To check your BB shell alignment, first center your rear wheel as well as possible between the chainstays, then measure the distance from each side of the BB spindle to the rear axle. If the spindle is not parallel to the axle, you do have a problem.
To check your BB shell alignment, first center your rear wheel as well as possible between the chainstays, then measure the distance from each side of the BB spindle to the rear axle. If the spindle is not parallel to the axle, you do have a problem.
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Capo: 1959 Modell Campagnolo, S/N 40324; 1960 Sieger (2), S/N 42624, 42597
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"Far and away the best prize that life offers is the chance to work hard at work worth doing." --Theodore Roosevelt
Capo: 1959 Modell Campagnolo, S/N 40324; 1960 Sieger (2), S/N 42624, 42597
Carlton: 1962 Franco Suisse, S/N K7911
Peugeot: 1970 UO-8, S/N 0010468
Bianchi: 1982 Campione d'Italia, S/N 1.M9914
Schwinn: 1988 Project KOM-10, S/N F804069
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Originally Posted by John E
If your inner chainring clears the chainstay by more than a couple of mm, your BB may be mounted too far to the right. I am not familiar with the inner guts of DA, but both of my Campag. cartridge BBs have narrow shims which could be juggled to fine-tune the chainline.
Last edited by sydney; 09-02-04 at 08:17 PM.
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Thanks for the info. The inner chain ring bolts clear the chain stay by no more than half the width of a dime...almost looks like its rubbing, but it's not. ( but it's the other side I'm having the issue with) Should the distance between the crank arm and the chain stay on both sides be the same?
Thanks for your comments
Thanks for your comments
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Originally Posted by maxpsi
Thanks for the info. The inner chain ring bolts clear the chain stay by no more than half the width of a dime...almost looks like its rubbing, but it's not. ( but it's the other side I'm having the issue with) Should the distance between the crank arm and the chain stay on both sides be the same?
Thanks for your comments
Thanks for your comments
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Originally Posted by sydney
You can ask questions all day and everyone can take a guess. Pull the crank arms and measure the spindle length.It should be 118.5 for the DA triple.