Chain / chainring / cassette / rear derailleur - wear and tear Chain My chain on the ST3 lasts about 10,000 km. If I change it, I always change the 11 mm sprocket as well. This one...
Pulley(s) / belt(s) - wear See PROBLEMS - Chain (-blade) / pulleys and belts: - 'Pulley(s) / belt(s) worn'- 'Belt torn / has tooth failure'
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