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Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

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Old 07-24-09, 10:00 AM   #1
dave345
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Rear mech adjustment

EDIT: Title should be, FRONT mech adjustment!

Hi there, I don't know much about bike maintenance so apologies for incorrect terminology. I've been trying to adjust the front mech as the chain was rubbing against the deraillieur. Whilst trying to do this i slackened the cable too much and it came out (if that makes sense). I made the necessary adjustment (to stop rubbing) in the lowest gear using the L screw. However, when i tightened the cable again and tried to move up to the biggest chainring it wouldn't move because the cable became very tight very quickly. If I tried to stop this happening it was far to slack when in the bottom gear. What could the problem be?

Thanks.

Last edited by dave345; 07-24-09 at 10:22 AM.
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Old 07-24-09, 10:24 AM   #2
bikeman715
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loosen the anchor bolt pull cable taut and re tighten the bolt. when shifting the cable tighten even more and move the dérailleur.
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Old 07-24-09, 10:43 AM   #3
dave345
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What do you mean by "when shifting the cable"? Do you mean change the gear at the handle bars, if i do that I can only do about 3 clicks (out of 9) before it becomes too tight to move. This means the derailleur isnt moving across to the middle and highest chainrings.
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Old 07-24-09, 03:49 PM   #4
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yes , move the shifter.you do need to move the pedals (like riding the bike) so the chain can move from one chainring to another.if the chain want to move but doesn't use the adjustment barrels on the down tube until it does.make sure when you start this , the shifter is in the first click. and the cable is taut at the anchor.pull with a pair of pliers.but doesn't move the dérailleur,if you do then it to tight and back off .
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Old 07-24-09, 03:54 PM   #5
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The shifter needs to be in its lowest position before attaching the cable to the derailleur.
Flip the smaller shift lever several times. Loosen the cable attaching screw and take the slack out of the cable. Reattach the cable to the derailleur. In the future use the derailleur adjustment instructions found at http://www.parktool.com.

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