Front Derailleur for 46-36-26 Crank
04-28-07, 06:37 PM
#26
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Originally Posted by bwgride
Collie --
The shim may be the reason. I'd look for a FD that fits the tube correctly. By rub, I assume you mean the chain rubs against the cage side and not the cage bottom. If the bottom is where the rub occurs, then lower the dérailleur a millimeter or two. If the chain rubs against the side, there are at least three things to explore.
The shim may be the reason. I'd look for a FD that fits the tube correctly. By rub, I assume you mean the chain rubs against the cage side and not the cage bottom. If the bottom is where the rub occurs, then lower the dérailleur a millimeter or two. If the chain rubs against the side, there are at least three things to explore.
The chain rubs on the side in certain gear combinations because when you mount the derailleur high to clear the middle 'ring, the ramps in the sides of the cage are in the incorrect position. Instead of pushing the chain during a shift, it pushes the chain when *not* shifting.
04-29-07, 11:20 AM
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Todd,
Have you tried any of the Shimano trekking style front derailers with the Sugino 110 BCD cranksets? Like the FD-M581-3 or FD-M761-3? (the -3 is the important number here) Shimano still makes nice trekking cranksets--- so the chainring size (26-36-46) can't be the problem. Is it possible the Sugino super-shift pins are getting in the way?
Have you tried any of the Shimano trekking style front derailers with the Sugino 110 BCD cranksets? Like the FD-M581-3 or FD-M761-3? (the -3 is the important number here) Shimano still makes nice trekking cranksets--- so the chainring size (26-36-46) can't be the problem. Is it possible the Sugino super-shift pins are getting in the way?
04-29-07, 07:06 PM
#28
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Originally Posted by tacomee
Todd,
Have you tried any of the Shimano trekking style front derailers with the Sugino 110 BCD cranksets? Like the FD-M581-3 or FD-M761-3? (the -3 is the important number here) Shimano still makes nice trekking cranksets--- so the chainring size (26-36-46) can't be the problem. Is it possible the Sugino super-shift pins are getting in the way?
Have you tried any of the Shimano trekking style front derailers with the Sugino 110 BCD cranksets? Like the FD-M581-3 or FD-M761-3? (the -3 is the important number here) Shimano still makes nice trekking cranksets--- so the chainring size (26-36-46) can't be the problem. Is it possible the Sugino super-shift pins are getting in the way?
Sugino's pins aren't getting in the way, the =teeth= on the middle ring rub the inner cage plate. The only way to make a Sugino crankset work well with a new Shimano FD is to use a road FD, or change a chainring. There may even be problems with road FDs. I haven't closely investigated that.
The bottom line is that Shimano seems =not= to support a 10T difference between the middle and big rings with MTB components any more.
05-01-07, 02:28 AM
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Originally Posted by bwgride
Collie --
The shim may be the reason. I'd look for a FD that fits the tube correctly. By rub, I assume you mean the chain rubs against the cage side and not the cage bottom. If the bottom is where the rub occurs, then lower the dérailleur a millimeter or two. If the chain rubs against the side, there are at least three things to explore.
First, check the adjustments on the dérailleur to ensure the limit stop is not preventing the dérailleur from retracting completely.
Second, it is possible the bottom bracket you have is not placing the crank set far enough away from your frame. However, if that were the case, the inner chain ring may rub against the frame itself, so this is unlikely to be the cause.
A third possibility may lie with the alignment of the dérailleur; you may need to tilt the cage at a different angle to the chain to allow for clearance.
The shim may be the reason. I'd look for a FD that fits the tube correctly. By rub, I assume you mean the chain rubs against the cage side and not the cage bottom. If the bottom is where the rub occurs, then lower the dérailleur a millimeter or two. If the chain rubs against the side, there are at least three things to explore.
First, check the adjustments on the dérailleur to ensure the limit stop is not preventing the dérailleur from retracting completely.
Second, it is possible the bottom bracket you have is not placing the crank set far enough away from your frame. However, if that were the case, the inner chain ring may rub against the frame itself, so this is unlikely to be the cause.
A third possibility may lie with the alignment of the dérailleur; you may need to tilt the cage at a different angle to the chain to allow for clearance.
