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#1
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Campy front derailleur won't shift
Folks, I've got a really strange problem. I've got a Centaur front
derailleur that won't push the chain onto the big ring. Forget the limit adjusting screw, forget adjusting the cable. Problem is that with the limit screw completely counter-clockwise, and the cable disconnected, I cannot physically move the derailleur (with my hand) far enough. There's just not enough travel in the dang thing to move the cage over the big ring. Which means either (a) the derailleur is mounted too far in, or (b) the crankset is mounted too far out, or (c) maybe a little of both. Here are the pertinent details. First, the frame is a Calfee, with an oversize seat tube. The derailleur is a Centaur braze-on type mounted with one of those clamp-on adapter do-bobs. Question #1: is anybody out there using a Centaur braze-on front derailleur with an adapter thingy on a bike that has an oversize seat tube? I wonder if this setup places the derailleur too close to the seat tube initially? Next, the bottom bracket is the cheaper Centaur/Veloce type, English thread, while the crankset is Chorus. Just eyeballing the bottom bracket, it looks like bottom bracket extends out a bit farther than "normal", pushing the crankset out just a bit farther.... which leads to.... Question #2: Can any of you Campy gurus tell me if the axle length of a Centaur/Veloce bottom bracket is longer than axle length of a Chorus bottom bracket? I'm also wondering if perhaps it's a combination of a bottom bracket that is a bit wider than ususal, and the Centaur crankset is designed to make up for this by moving the chainrings in a bit closer. By placing a Chorus crankset on this bottom bracket, the chainrings have moved out a bit farther than normal. Question #3: Can any of you Campy gurus tell me if a Chorus crankset and a Centaur crankset would place the chainrings in the same position, given that the bottom bracket is not changed? I could spend yet MORE money to but a Chorus bottom bracket and buy a genuine clamp-on front derailleur, but I've already spent enough on this "project", and I'd really like to try and use what I've already paid for. Thanks in advance, Mike Lackey Madison, AL |
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#2
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Campy front derailleur won't shift
Mike Lackey wrote:
Folks, I've got a really strange problem. I've got a Centaur front derailleur that won't push the chain onto the big ring. Forget the limit adjusting screw, forget adjusting the cable. Problem is that with the limit screw completely counter-clockwise, and the cable disconnected, I cannot physically move the derailleur (with my hand) far enough. There's just not enough travel in the dang thing to move the cage over the big ring. Which means either (a) the derailleur is mounted too far in, or (b) the crankset is mounted too far out, or (c) maybe a little of both. Here are the pertinent details. First, the frame is a Calfee, with an oversize seat tube. The derailleur is a Centaur braze-on type mounted with one of those clamp-on adapter do-bobs. Question #1: is anybody out there using a Centaur braze-on front derailleur with an adapter thingy on a bike that has an oversize seat tube? I wonder if this setup places the derailleur too close to the seat tube initially? Next, the bottom bracket is the cheaper Centaur/Veloce type, English thread, while the crankset is Chorus. Just eyeballing the bottom bracket, it looks like bottom bracket extends out a bit farther than "normal", pushing the crankset out just a bit farther.... which leads to.... Question #2: Can any of you Campy gurus tell me if the axle length of a Centaur/Veloce bottom bracket is longer than axle length of a Chorus bottom bracket? I'm also wondering if perhaps it's a combination of a bottom bracket that is a bit wider than ususal, and the Centaur crankset is designed to make up for this by moving the chainrings in a bit closer. By placing a Chorus crankset on this bottom bracket, the chainrings have moved out a bit farther than normal. Question #3: Can any of you Campy gurus tell me if a Chorus crankset and a Centaur crankset would place the chainrings in the same position, given that the bottom bracket is not changed? I could spend yet MORE money to but a Chorus bottom bracket and buy a genuine clamp-on front derailleur, but I've already spent enough on this "project", and I'd really like to try and use what I've already paid for. Look at your chainline. Your crank is out there! Your ACH BB is 111 (or 115)mm wide, Chorus cranks want a 102. -- Andrew Muzi www.yellowjersey.org Open every day since 1 April, 1971 |
#3
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Campy front derailleur won't shift
"A Muzi" wrote in message ... Mike Lackey wrote: Folks, I've got a really strange problem. I've got a Centaur front derailleur that won't push the chain onto the big ring. Forget the limit adjusting screw, forget adjusting the cable. Problem is that with the limit screw completely counter-clockwise, and the cable disconnected, I cannot physically move the derailleur (with my hand) far enough. There's just not enough travel in the dang thing to move the cage over the big ring. Which means either (a) the derailleur is mounted too far in, or (b) the crankset is mounted too far out, or (c) maybe a little of both. Here are the pertinent details. First, the frame is a Calfee, with an oversize seat tube. The derailleur is a Centaur braze-on type mounted with one of those clamp-on adapter do-bobs. Question #1: is anybody out there using a Centaur braze-on front derailleur with an adapter thingy on a bike that has an oversize seat tube? I wonder if this setup places the derailleur too close to the seat tube initially? Next, the bottom bracket is the cheaper Centaur/Veloce type, English thread, while the crankset is Chorus. Just eyeballing the bottom bracket, it looks like bottom bracket extends out a bit farther than "normal", pushing the crankset out just a bit farther.... which leads to.... Yes, I have an older Carbonframes tetra custom that requires an italian threaded bottom bracket. I use an older Edco Competition bb that has a 116mm wide spindle with a Record 9 crankset 51x39 and C-Record ft der. Works perfectly. Question #2: Can any of you Campy gurus tell me if the axle length of a Centaur/Veloce bottom bracket is longer than axle length of a Chorus bottom bracket? I'm also wondering if perhaps it's a combination of a bottom bracket that is a bit wider than ususal, and the Centaur crankset is designed to make up for this by moving the chainrings in a bit closer. By placing a Chorus crankset on this bottom bracket, the chainrings have moved out a bit farther than normal. For me, I use the wide 70x116 Edco bb because anything narrower will cause my inner chainring to touch the chainstay. Question #3: Can any of you Campy gurus tell me if a Chorus crankset and a Centaur crankset would place the chainrings in the same position, given that the bottom bracket is not changed? I could spend yet MORE money to but a Chorus bottom bracket and buy a genuine clamp-on front derailleur, but I've already spent enough on this "project", and I'd really like to try and use what I've already paid for. Look at your chainline. Your crank is out there! Your ACH BB is 111 (or 115)mm wide, Chorus cranks want a 102. I agree, check the chainline. The crank on my bike is *out there*, but it works. |
#4
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Campy front derailleur won't shift
mr blutarsky- Folks, I've got a really strange problem. I've got a Centaur
front derailleur that won't push the chain onto the big ring. BRBR I cannot physically move the derailleur (with my hand) far enough. BRBR Next, the bottom bracket is the cheaper Centaur/Veloce type, English thread, while the crankset is Chorus BRBR Your problem. Use a Campagnolo 102mm, english threaded BB, either Record or Chorus. Not the 111mm BB. Mr- Question #3: Can any of you Campy gurus tell me if a Chorus crankset and a Centaur crankset would place the chainrings in the same position, given that the bottom bracket is not changed? BRBR With the proper BB-102 for Record and Chorus, 111 for all others, the rings will be in the same place. ya gotta match the crank/BB- Peter Chisholm Vecchio's Bicicletteria 1833 Pearl St. Boulder, CO, 80302 (303)440-3535 http://www.vecchios.com "Ruote convenzionali costruite eccezionalmente bene" |
#5
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Campy front derailleur won't shift
As everyone else has already noted, you need either a
Centaur/Veloce/Mirage crankset to go on your AC-H Centaur/Veloce/Mirage bottom bracket, or a Chorus/Record bottom bracket to go with your Chorus crankset. I use a 111mm AC-H Centaur bottom bracket and Centaur triple crankset on a 31.8mm seattube. Not the longer 115 mm bottom bracket. And clamp on Shimano 105 triple front derailleur. About the bottom brackets. The AC-H Centaur bottom brackets, 111mm and 115mm, are symmetrical. Same spindle length sticking out both sides of the bottom bracket shell. The Chorus/Record bottom brackets are asymmetrical. There is less spindle sticking out the drive side. I think. Or maybe its the other way. "Mike Lackey" wrote in message news:Aujec.13861$wP1.31586@attbi_s54... Folks, I've got a really strange problem. I've got a Centaur front derailleur that won't push the chain onto the big ring. Forget the limit adjusting screw, forget adjusting the cable. Problem is that with the limit screw completely counter-clockwise, and the cable disconnected, I cannot physically move the derailleur (with my hand) far enough. There's just not enough travel in the dang thing to move the cage over the big ring. Which means either (a) the derailleur is mounted too far in, or (b) the crankset is mounted too far out, or (c) maybe a little of both. Here are the pertinent details. First, the frame is a Calfee, with an oversize seat tube. The derailleur is a Centaur braze-on type mounted with one of those clamp-on adapter do-bobs. Question #1: is anybody out there using a Centaur braze-on front derailleur with an adapter thingy on a bike that has an oversize seat tube? I wonder if this setup places the derailleur too close to the seat tube initially? Next, the bottom bracket is the cheaper Centaur/Veloce type, English thread, while the crankset is Chorus. Just eyeballing the bottom bracket, it looks like bottom bracket extends out a bit farther than "normal", pushing the crankset out just a bit farther.... which leads to.... Question #2: Can any of you Campy gurus tell me if the axle length of a Centaur/Veloce bottom bracket is longer than axle length of a Chorus bottom bracket? I'm also wondering if perhaps it's a combination of a bottom bracket that is a bit wider than ususal, and the Centaur crankset is designed to make up for this by moving the chainrings in a bit closer. By placing a Chorus crankset on this bottom bracket, the chainrings have moved out a bit farther than normal. Question #3: Can any of you Campy gurus tell me if a Chorus crankset and a Centaur crankset would place the chainrings in the same position, given that the bottom bracket is not changed? I could spend yet MORE money to but a Chorus bottom bracket and buy a genuine clamp-on front derailleur, but I've already spent enough on this "project", and I'd really like to try and use what I've already paid for. Thanks in advance, Mike Lackey Madison, AL |
#6
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Campy front derailleur won't shift
Thanks to all who've replied. It's (painfully) obvious I've got a
mismatched crankset and bottom bracket. Dangit! Mike Lackey Madision, AL "Mike Lackey" wrote in message news:Aujec.13861$wP1.31586@attbi_s54... Folks, I've got a really strange problem. I've got a Centaur front derailleur that won't push the chain onto the big ring. Forget the limit adjusting screw, forget adjusting the cable. Problem is that with the limit screw completely counter-clockwise, and the cable disconnected, I cannot physically move the derailleur (with my hand) far enough. There's just not enough travel in the dang thing to move the cage over the big ring. Which means either (a) the derailleur is mounted too far in, or (b) the crankset is mounted too far out, or (c) maybe a little of both. Here are the pertinent details. First, the frame is a Calfee, with an oversize seat tube. The derailleur is a Centaur braze-on type mounted with one of those clamp-on adapter do-bobs. Question #1: is anybody out there using a Centaur braze-on front derailleur with an adapter thingy on a bike that has an oversize seat tube? I wonder if this setup places the derailleur too close to the seat tube initially? Next, the bottom bracket is the cheaper Centaur/Veloce type, English thread, while the crankset is Chorus. Just eyeballing the bottom bracket, it looks like bottom bracket extends out a bit farther than "normal", pushing the crankset out just a bit farther.... which leads to.... Question #2: Can any of you Campy gurus tell me if the axle length of a Centaur/Veloce bottom bracket is longer than axle length of a Chorus bottom bracket? I'm also wondering if perhaps it's a combination of a bottom bracket that is a bit wider than ususal, and the Centaur crankset is designed to make up for this by moving the chainrings in a bit closer. By placing a Chorus crankset on this bottom bracket, the chainrings have moved out a bit farther than normal. Question #3: Can any of you Campy gurus tell me if a Chorus crankset and a Centaur crankset would place the chainrings in the same position, given that the bottom bracket is not changed? I could spend yet MORE money to but a Chorus bottom bracket and buy a genuine clamp-on front derailleur, but I've already spent enough on this "project", and I'd really like to try and use what I've already paid for. Thanks in advance, Mike Lackey Madison, AL |
#7
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Campy front derailleur won't shift
Chorus uses a 102 ISO bb and Centaur and Veloce use 111.
On Sun, 11 Apr 2004 22:18:08 GMT, "Mike Lackey" wrote: Question #2: Can any of you Campy gurus tell me if the axle length of a Centaur/Veloce bottom bracket is longer than axle length of a Chorus bottom bracket? I'm also wondering if perhaps it's a combination of a bottom bracket that is a bit wider than ususal, and the Centaur crankset is designed to make up for this by moving the chainrings in a bit closer. By placing a Chorus crankset on this bottom bracket, the chainrings have moved out a bit farther than normal. |
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