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Old 05-15-21, 09:08 AM
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Join Date: Oct 2019
Location: Foothills of West Central Maine
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Bikes: 2007 Motobecane Fantom Cross Expert, 2020 Motobecane Omni Strada Pro Disc (700c gravel bike), 2021 Motobecane Elite Adventure with Bafang 500W rear hub drive

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Both front and rear shifters are failing at the same time? How many miles on those shifters? Hard to advise without knowing age/mileage.

I have the same shifters and chainrings, and had a problem with dropped shifts on rear Tiagra 4700 RD with 11/34. I started to pull the rear cable to replace it, noticed it was greased all except last inch plus inside shifter. Greased that and it's been good.

I'd look closely at condition of cables before giving up on shifters. Any fraying can cause inconsistency. To be safe on compatibility if you do replace shifters, get the same model.
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