Otto Tuning System
If your shifting is clunky, just clip these two plastic gauges onto your derailleur and cassette, and an app can walk you through the adjustment using your iPhone's camera. PRO TIP: If you are not shifting smoothly after using the Otto, chances are you have a bent derailleur hanger and will need a mechanic. [$39; ottodesignworks.com (plus in-app purchase)]
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