Have questions or want to discuss cycling? Join Now or Sign In to participate in the BikeRide community.

New: Take part in the July Giveaway for a brand new 26" Thruster® Street Style BMX Cruiser Bicycle


Shifter help
#1
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
  Reply
#2
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
  Reply
#3
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!"
  Reply
#4
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.
  Reply
#5
(07-21-2013, 08:59 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
  Reply
#6
(07-22-2013, 05:46 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
(07-21-2013, 08:59 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
  Reply


Forum Jump:

[-]
10 Latest Posts
Peugeot Nouveau Folder
Today 10:33 AM
Steel frame damage
Today 03:11 AM
Post a photo for aeroe Spider Rear Rack
Yesterday 11:06 PM
Spacer hope pf41 bb
Yesterday 09:14 PM
QUINTANA ROO "KILO" 1999
Yesterday 05:21 PM
26" Thruster® Street Style BMX | July 20...
Yesterday 03:56 PM
budget speedometer
Yesterday 02:44 AM
Biking inUtah
07-14-2020 10:25 AM
Requested question
07-13-2020 11:20 PM
Ceramic Oversize Pulley
07-13-2020 11:07 PM

[-]
Top 5 Posters This Month
no avatar 1. Jesper
76 posts
no avatar 2. CharleyFarley
24 posts
no avatar 3. Papa Dom
11 posts
no avatar 4. Painkiller
8 posts
no avatar 5. Sagan97
7 posts