Inte enligt litteraturen jag läst, tex wikibooks:
Set the Cable Tension
[edit http://en.wikibooks.org/w/index.php?title=Bicycles/Maintenance_and_Repair/Derailleurs/Rear_Derailleur_Adjustment&action=edit§ion=8] Barrel-adjusters
The barrel-adjuster is usually found on the right handlebar or on the derailleur itself, at the point where the shift cable enters the derailleur. See Figure 2 for an example of the latter. In all cases it does not matter /where/ the adjustment-barrel is located, screwing it in (clockwise) slackens the cable and unscrewing it tightens the cable.
The gear-shifter moves in discrete steps, and each step is translated by the derailleur into the exact distance (the pitch) across the sprockets of the cluster. Thus, moving the shifter one step, regardless of the starting point, will lengthen or shorten the cable by an exact amount. The only bug in this system is the /residual/ slackness or over-tightness in the cable itself. To see why the barrel-adjuster is needed, consider these two examples.
* If the cable has too much residual slackness when the handlebar shifter is operated, say from the smallest sprocket to the next-smallest, then a part of the resultant cable shortening will be used in /first/ taking up the cable slack, /then/ in moving the derailleur. As a result, the shortening is not all available to move the derailleur, and it is unlikely to move far enough to move the chain properly and make a successful gear change.
* Similarly, when the cable is too tight, shifting between say, the largest sprocket and the second largest will result in the shifter lengthening the cable by one unit. Because of the residual over-tension in the cable that tends to move the derailleur inward, not all of the intended lengthening will be available to the derailleur. It will not quite reach far enough.
* In both of the examples above the chain will likely make a noise as it shifts, but if the tension in the cable is not excessive, the chain might still pull itself onto the right sprocket; if the tension in the cable is too high then the chain might rattle somewhere in between the sprockets.
*The entire function of the handlebar barrel-adjuster is to remove any /residual/ slackness or over-tension in the cable so that the /exact/ lengthening and shortening (indexed shifting) of the cable by the handlebar shifter has no error*.
Skruven spänner höljet och inte vajern. Om höljet är fel påverkar reglaget det istället för växeln. Men som jag skrev tidigare: finjustering
mvh HenningPeter Markusson skrev 2012-03-11 20:42:
Kjell har rätt, den påverkar inte avstånden mellan växellägena...
11 mar 2012 kl. 19.58 skrev Kjell Lövström:
Den skruven kan väl knappast påverka det? den är väl närmast avsedd för att justera eventuell töjning av vajern?
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