Bicycle TutorBicycle Tutor

Show off your bike!

Related video tutorials:
How to Adjust Your Front Derailleur How to Adjust Your Front Derailleur
* Now with 3D interactive instructions
Shimano derailler issue
#1
My old mountain bike has Shimano thumb shifters. The front derailler will shift to the larger chainrings, but springs back onto the smallest chainring if I let go of the shifter. Any advice? Thanks.
Reply
#2
Look at the top of the shifter and see if there is a screw or a flat ridge you can grab. If so, tighten these down so that the shifter will still move, but doesn't slip back to the small gear by itself. If not, maybe picture or model # of the shifter would help.
Reply
#3
(07-24-2012, 07:56 PM)DaveM Wrote:  Look at the top of the shifter and see if there is a screw or a flat ridge you can grab. If so, tighten these down so that the shifter will still move, but doesn't slip back to the small gear by itself. If not, maybe picture or model # of the shifter would help.


Thanks. They are Shimano Diore XT model shifters, and on top there is an allen nut, but it seems pretty darn tight. I can try to tighten it a bit more. There are a couple of screws on the bottom/side, but they seem quite secure and didn't seem to affect anything. But thanks for your suggestions. I'll keep playing with them!
Reply
#4
let me see a pic of your thumb shifters
There are two kinds of people in the world, "Those who help themselves to people, and those who help people!"
Reply
#5
Thanks - I have to leave town this morning for a trip, but will continue on my return (getting a picture posted takes some thought for me - I'm not hugely tech savvy).
Reply
#6
Picture of the top and one picture of the bottom, save both pictures to your desktop. When you click on the "new reply" button on this site scroll down there is Attach Picture or attach file, after you click that a menu will pop up and then you can navigate the menu to your desktop and find the name of the picture, click once on the name of the picture and then click ok.Then click Post reply. That simple.
Good maintenance to your Bike, can make it like the wheels are, true and smooth!
Reply
#7
Sorry about the hiatus - I've been out of town. Here are a couple pics of my old front derailler and thumb controls. Again, the front controls will get the derailler to the larger two chainrings, but it springs back to the smaller ring as soon as I let go of the trigger. Any suggestions of how to get this to work again? Thanks. Kay[attachment=3411][attachment=3412]
Reply
#8
Hi Kay;

Your shifter looks like a trigger shifter; not a thumb shifter.

http://www.interlocracing.com/shifter_thumb1.jpg

Trigger shifters are far more complicated.
Nigel
Reply
#9
(08-15-2012, 08:22 PM)nfmisso Wrote:  Hi Kay;

Your shifter looks like a trigger shifter; not a thumb shifter.

http://www.interlocracing.com/shifter_thumb1.jpg

Trigger shifters are far more complicated.

Thanks. Should I take it to someone or is it not worth even fixing?
Thanks. Is it worth fixing, i.e., paying someone to do it? KD
Reply
#10
Kayd, update your bio and tell us where you are from, I may have parts. tell us the model number of your shifter. it is hard to see and under by the levers. they appear to be Sti push push style and not trigger.
I f you are in the us and will pay shipping I will have a look for you and may have spare parts to get you going again.
There are two kinds of people in the world, "Those who help themselves to people, and those who help people!"
Reply
#11
The factory grease may have stiffened up over the years to the point that the springs that work the pawls are not letting them engage. I took my shifters off the bike and soaked them in Simple Green for a couple of days and that fixed it. Then I found out that WD40 applied generously through the cable cap or other similar entry (without taking the cover off) will cure the same issue. Worth a try...
Reply
#12
Thanks. I'll give it a try.
Reply


Possibly Related Threads...
Thread Author Replies Views Last Post
  Shimano revo shift issue poppajeff 6 10,456 08-17-2014, 12:29 PM
Last Post: george@georgespeller.com
  Shimano shifting issue wboftn 12 12,118 10-27-2012, 10:48 PM
Last Post: painkiller
  Shimano 105 FD, Shift Issue kyrannian 5 5,863 09-15-2012, 07:26 AM
Last Post: kyrannian
  Rear Derailler not not moving to top gears kwwmackenzie 2 7,503 07-20-2011, 02:49 AM
Last Post: AndrewB
  Putting rear derailler back on after shipping kellybikequest 1 4,874 04-25-2011, 08:50 PM
Last Post: cyclerUK
  Rear derailler problems catswain 3 6,736 11-22-2010, 01:55 AM
Last Post: bikesterTodd
  New derailler, but shifter has no SIS barrel adjuster burgidunit 9 14,106 09-14-2010, 10:09 AM
Last Post: burgidunit
  How to Put on a Derailler with Adaptor Claw (hanger) VIDEO Bill 6 10,063 07-24-2010, 11:11 PM
Last Post: Bill
  Rear derailler "too small" for new sprocket set eddie_matos 1 9,602 11-01-2009, 07:58 PM
Last Post: cyclerUK

Forum Jump:



ISSN 1918-3445 © Copyright 2007-2010 Bicycle Tutor / Privacy Policy / Created by Alex Ramon

feed