Bicycle Mechanics - Fine tuning rear derailure via at the front of the cable?
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08-03-09, 05:08 PM
My chain is slipping on my rear cogs when it up shifts and down shifts (usually the 2 and 3rd rear cogs). I been turning the twist tension knob at the top of the cable by the down tube(?) where it travels down and to the rear. This is a new bike with Ultegra components. It does not seem to be working (which is why I am here), do I need to focus on the limit screws on the rear derailure itself, or take it back to the shop. I'd really like to do it myself, does anyone have a good website or other advice?
When a new bike skips while shifting it is usually due to shift cable stretch. Tightening the cable should fix the problem. Try 1/2 turn counter-clockwise on the barrel adjuster found at the rear derailleur. It the problem persists try another 1/2 turn counter-clockwise.
If you take the bike back to the dealer the first tune-up should be free. You could ask the mechanic to show you how to adjust the derailleurs.
Another good source of adjustment information can be found at http://www.parktool.com.
08-03-09, 05:50 PM
yeah.. parktool.com The H and L stops are so that you dont end up shifting into the spokes or towards the frame. I would put all of the slack back in, pull on the cable to get the stretch out, unfastened, pull taut and refasten. Then shift through and then use the barrel to fine tune.
08-03-09, 05:54 PM
The plastic adjuster at the headtube must be slid forward on the cable about 1/8 of an inch, or else the knob is not engaging the adjuster....sort of newbie proof adjusters
08-03-09, 08:05 PM
Thank you gentlemen (and ladies if you replied--hard to tell by screen names).
08-03-09, 08:53 PM
Recommended torque on the pinch-bolt that anchors the cable is 48 - 60 inch-pounds for both the RD and the FD.
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