Inside cables and outside cables.
In order to have a properly working index a system, it is important that the displacement of the cable into the adjuster is transmitted without losses to the derailleur. The cable of an index system may not stretch.
Therefore, we prefer to use original and pre-stretched stainless steel derailleur cables.
Also on the outside cables thre are special requirements. Of course these may also not stretch.
Therefore, the outer cables in the lining are provided with steel cables which run in the direction of movement of the inner cable.
This will prevent that the outer cables especially in curves go racks.
All too often we use the brake casing, these cables are very flexible but stretch during the switching.
Good outdoor cables are internally provided with a Teflon coating.
The Teflon layer reduces the friction between the inner and the outer casing.
These cables shall never be lubricated.
The Teflon coating will dissolve namely if a lubricant is used.
An improperly functioning derailleur system is 90% of the cases due to problems with derailleur cables.
Especially with mountain bikes often happens that by dirt and moisture, the system stops working properly.
In particular, the piece of derailleur cable that runs from the swingarm to the rear derailleur is sensitive.
- Equip the cable of the right cable stops. The cable stops have to have flat ends and the correct diameter.
If the cable stops do not have a flat end, the wires of the outer casing are pushed inwards against the cable, creating extra friction.
Preferably use cable stops with sealed ends, in order to prevent the ingress of dirt.
Use special pliers to squeeze the cable ends. See fig. 44.
- Lubricate the cables.
- Thread the cable through the shifter, the outer cable to the shift lever, cams and guide on the frame, outer cable to the rear derailleur and derailleur.
- Pull the cable tight and check that the cable is attached anywhere good.
The outer casing should be good straight into the lugs of the frame and drop in the shifter and derailleur.
The cable must fall well into the shifter and good in the cable guide beneath the bottom bracket. See fig. 45 and fig. 46.
- Tighten the cable. Make sure the cable is correctly positioned in the groove of the clamping bolt.
- Check the attachment of the cable by pulling on the down tube of the inner cable. See fig. 47. By pulling the cable is repositioned. Attach the cable again, if the cable then comes to be weak.
- Always protected the inner derailleur cable with a cable hat in order to prevent fraying of the cable.
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