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cable tension questions(5 posts)

cable tension questionsnamir
Jun 19, 2002 7:30 PM
What should the right amount of cable tension feel like if I push the cable with my fingers? Should it make a "twang" kind of sound? Should it be relatively loose? Thanks! I'm trying to narrow down some problem's I'm having. Also, what causes chain skipping on the rear derailleur?
re: cable tension questionsJuanmoretime
Jun 20, 2002 1:39 AM
Hi, The cable should have tension on it and definitely not loose. Your skipping problem could be as simple as a derailluer adjustment, a worn out cassette, worn out chain or a link could be binding in the chain or any combination of the above. How many miles are on the chain and cassette? Inspect each link to make sure that they move freely. If your rear derailluers adjustment is off by a 1/4 to 1/2 turn it could skip on certain cogs. Try adusting the rear derailuer only 1/4 a turn at a time. If the skipping gets worse, turn it in the other direction. If you can't adjust the skip out, it's probably the chain or cassette.

I hope this helps! LoL
Indexing cable tensionCalvin
Jun 20, 2002 3:41 AM
If the indexing is correctly set, it is automatically "correct". One click with the lever should get you one gear. See http://www.parktool.com/repair_help/FAQrindx.shtml
Indexing cable tensionChen2
Jun 20, 2002 8:36 AM
The way that cable tension often causes skipping is when the cable stretches, the tension becomes too low. Then when you shift to a lower speed (larger cog) and apply pressure with your pedals, the chain may jump right back to the cog you were in before the shift. If this is the problem, turning the barrel adjuster counter-clockwise a half-turn at a time while riding the bike between adjustments, should fix it. If you get too much tension the derailleur will refuse to shift to the smallest cog.
~Al
Just a simple clarification...Matno
Jun 20, 2002 4:09 PM
Cable "tension" is entirely dependent on the derailleur spring. The only time it will change is if you are still shifting after the derailleur has reached one of its limit screws. Cable LENGTH is what is important. Over time cables can and do stretch, so the cable must be shortened (or "tightened" as some people would say). I adjust mine by getting the cable length as close as I can, then I shift it through a variety of gear combinations and tweak the barrel adjusters until it shifts just right. It only takes a few minutes, but it can make your drivetrain feel like its brand new again...