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Unable to select bottom gear shimano 100gs

Unable to select bottom (lowest) gear Shimano 100GS - looking for range adjustment?

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Here is a link to a tech sheet for a Shimano Deore rear derailleur. It is not your exact one, but all Shimano derailleurs are more or less the same. Make sure you have thoroughly cleaned your drivetrain with a degreaser (like Simple Green) and a brush to clear all grease and debris before making adjustments. The second step is to shift into your highest gear (the smalles cog) and then release the cable in the derailleur, pull taut and retighten it. Check again to make sure you can not get into low gear, because it may have been a problem with cable tension, which you just fixed. If it still does not, then adjust the "L" setting on the derailleur so that the jockey wheel on the derailleur will move just ever so slightly past the last cog on the cassette when the shifter is fully engaged.

Hope this helps,
matt

Posted on Oct 08, 2009

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I have replaced the cable on the 7speed Shimano SIS derailler and Ithink I ran the cacle through the shifter wrong. I can only get three gears to shift. This is a combo brake and shifter handlebar mount.


Hi,

All shimano derailleurs have two small screws located on the mechanism itself that allow you to adjust the position of the derailleur relative to the gears. The top one adhusts how far towards the wheel the chain can go and the bottom of the two adjusts how far towards the stop it goes.

Put the bike on a stand or just prop it up so the rear wheel can spin freely when you turn the pedals by hand

Put the shifter in the highest gear and turn the pedals, the adjust the top screw until it enters the top gear, you may need to adjust the cable tension also to do this.

Once you have it going easily into and out of the top gear adjust the bottom screw so that it easily goes into the bottom gear.

You should be done! Don't forget that for the first few rides the cable will stretch out a little so you may need to tinker with those screws a couple more times.

Hope this helps:)

This website might help you also http://sheldonbrown.com/derailer-adjustment.html

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