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Hey there,

I have noticed that my rear derailler is losing tension and when I´m going through roots and rocks, it starts moving forward pretty easilly and have had the chain coming out of the front ring with more frequency, specially when I´m using the smaller ring.

Any way to adjust this tension? or should I replace the spring coil?

Would appreciate any input on this issue

Thanks!
 

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Take a look at the rear derailleur and make sure you B-tension screw hasn't rattled itself loose. Tightening that B-tension screw will help; unfortunately, this will come at the expense of crisp shifting performance. Proper B-tension screw adjustment leaves approximately 5mm between the guide pulley and the largest cog on the rear cassette; tightening this screw will increase the distance between the guide pulley and the cassette, thus worsening shifting performance. Experiment with turning the B-tension screw to see if it improves the problem. The other option is to remember to shift into the middle or large ring up front when going through rough terrain.

 
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