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Shifter help

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papaw1 Offline
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Posts: 4
Joined: Jul 2013
Post: #1
Shifter help
hi, I have a used bike I just purchased, it has a rapid fire shifter on it that wont shift all the way down, at first I thought the problem was in the rear but I'm beginning to believe it's in the shifter. Can someone please tell [/font]me how to determine which it is, the shifter or derailleur?
thanks
Jul 21, 2013 05:13 PM
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nfmisso Offline
Veteran Member

San Jose, CA
Posts: 2,333
Joined: Jul 2010
Post: #2
RE: Shifter help
disconnect the cable from the derailleur; move the derailleur by hand across its stroke while turning the pedals (or remove the chain). The derailleur should spring to the H limit (little cog), but without too much force you should be able to move it to the L limit (big cog). Then make sure the limit screws are adjusted correctly.

The problem could also be a frayed cable - I'd replace all of the cables as a matter of course.

Nigel
Jul 21, 2013 05:59 PM
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painkiller Offline
Veteran Member

Peoria, IL. USA
Posts: 1,449
Joined: Mar 2011
Post: #3
RE: Shifter help
what is the model of your shifter? how old is it? lets see a pic of it. it could have solidified grease causing it not to work right


There are two kinds of people in the world, "Those who help themselves to people, and those who help people!"
Jul 21, 2013 06:49 PM
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DaveM Offline
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Posts: 1,400
Joined: Aug 2008
Post: #4
RE: Shifter help
Also, when you disconnect the cable, try holding the cable in your hand with light pressure and shift through the gears on the shifter. Count how many distinct positions you get. (Note that a 7 speed shifter will have 7 positions, but only 6 "clicks"). You should feel the cable move a couple mm on each click. If the # of positions doesn't match how many gears you have in the back, it could be a problem with the shifter or that someone put the wrong shifter on the bike.
Jul 22, 2013 02:46 AM
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papaw1 Offline
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Posts: 4
Joined: Jul 2013
Post: #5
RE: Shifter help
(Jul 21, 2013 05:59 PM)nfmisso Wrote:  disconnect the cable from the derailleur; move the derailleur by hand across its stroke while turning the pedals (or remove the chain). The derailleur should spring to the H limit (little cog), but without too much force you should be able to move it to the L limit (big cog). Then make sure the limit screws are adjusted correctly.

The problem could also be a frayed cable - I'd replace all of the cables as a matter of course.

thank you, that was very helpful
Jul 22, 2013 04:35 PM
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papaw1 Offline
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Posts: 4
Joined: Jul 2013
Post: #6
RE: Shifter help
(Jul 22, 2013 02:46 AM)DaveM Wrote:  Also, when you disconnect the cable, try holding the cable in your hand with light pressure and shift through the gears on the shifter. Count how many distinct positions you get. (Note that a 7 speed shifter will have 7 positions, but only 6 "clicks"). You should feel the cable move a couple mm on each click. If the # of positions doesn't match how many gears you have in the back, it could be a problem with the shifter or that someone put the wrong shifter on the bike.

thank you, very helpful
(Jul 21, 2013 05:59 PM)nfmisso Wrote:  disconnect the cable from the derailleur; move the derailleur by hand across its stroke while turning the pedals (or remove the chain). The derailleur should spring to the H limit (little cog), but without too much force you should be able to move it to the L limit (big cog). Then make sure the limit screws are adjusted correctly.

The problem could also be a frayed cable - I'd replace all of the cables as a matter of course.

thanks for the advice......very helpful
Jul 22, 2013 05:29 PM
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