Chain rubbing front derailier!!!
08-16-07, 05:17 PM
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Chain rubbing front derailier!!!
This is when using large ring in front and small gear in rear.The bike is a twentysomethig Bianchi six speed.She is almost perfect except for this. How do i make the correct adjustment
08-16-07, 05:51 PM
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You most likely just need to tighten the front derailleur cable. If there is a barrel adjuster, unscrew it, about a 1/4 or an 1/8 of turn at a time.
08-16-07, 06:01 PM
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You have your shifters (levers) on the headtube ot downtube, right? I don't think they have a cable adjuster, so you'll have to do it manually. Check to see if your cable is tight when the shift lever is parallel to the frame tube. If not, unclamp the cable at the front derailleur and pull the cable tight and re-clamp. Is the problem still there?
If so, when you pull the shifter down to shift to the big ring, does it stay all the way down or does it spring back up slightly? If yes, check to see if the bolt that hold the shifter to the frame is tight enough that it holds the shifter firmly and tighten if necessary.
If that's not the problem, your front derailleur isn't moving far enough to the right (looking down from the seated position) when you shift to the big ring. There is a screw that keeps the derailleur from going too far right so it won't go past the big ring and fall off. It is one of two screws usually on top of the derailleur. The other keeps the derailler from going too far left. Shift the chain to the big ring and small rear sprocket, pulling the front shifter all the way down (should be 90 degrees to the frame tube. Turn one screw 1/4 turn clockwise, enough to see if the derailleur moves. If it doesn't move, that's the left position hold-screw; put it back in the same position it was in before you turned it. If the derailleur moves, then that's the right screw to adjust. Turn it back out counter-clockwise the 1/4 turn you moved it, plus another 1/4 turn. Pull the shift lever down more now and the derailleur should move further right. Check to see if your problem is solved. If not, move the screw another 1/4 turn out and test again; repeat if necessary.
I hope that isn't too confusing. It takes longer to answer the question than to make the adjustments.
If so, when you pull the shifter down to shift to the big ring, does it stay all the way down or does it spring back up slightly? If yes, check to see if the bolt that hold the shifter to the frame is tight enough that it holds the shifter firmly and tighten if necessary.
If that's not the problem, your front derailleur isn't moving far enough to the right (looking down from the seated position) when you shift to the big ring. There is a screw that keeps the derailleur from going too far right so it won't go past the big ring and fall off. It is one of two screws usually on top of the derailleur. The other keeps the derailler from going too far left. Shift the chain to the big ring and small rear sprocket, pulling the front shifter all the way down (should be 90 degrees to the frame tube. Turn one screw 1/4 turn clockwise, enough to see if the derailleur moves. If it doesn't move, that's the left position hold-screw; put it back in the same position it was in before you turned it. If the derailleur moves, then that's the right screw to adjust. Turn it back out counter-clockwise the 1/4 turn you moved it, plus another 1/4 turn. Pull the shift lever down more now and the derailleur should move further right. Check to see if your problem is solved. If not, move the screw another 1/4 turn out and test again; repeat if necessary.
I hope that isn't too confusing. It takes longer to answer the question than to make the adjustments.
08-16-07, 06:58 PM
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1/4 Turn
yeah thats all it took the chain was just touching the cage enough that i could hear it.thanks i did not want to go to the bike shop with a complaint like that
