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Cable routing through the ST-R8000 shifter, bike frame and RD-R8000 short cage derailleur shown and explained.
Similar shifter models are DURA-ACE ST-R9100, BR-R9100, BR-R9110, ULTEGRA BR-R8000, BR-R8010, 105 ST-R7000, BR-R7000, BR-R7010.
Symptoms of cable failure are gradual, include chain not changing gears on chain rings when shifter is operated, derailleur not moving at all when shifter is operated. Braking is totally unaffected.
Similar rear derailleur models are DURA-ACE RD-R9100, 105 RD-R7000.
Ultegra Dual Control Lever ST-R8000
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SHIMANO ULTEGRA Short Cage Rear Derailleur 11-speed RD-R8000-SS
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Cable clamp bolt tightening torque 6-7 Nm