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Defective cassette or chain


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I recently built a brand new bike for a mate and it seemed like the 12t gear was slightly out of alignment. (On a 34x11 cassette)

 

SRAM. All the gears changed perfectly with the exception of 11 and 12.

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I recently built a brand new bike for a mate and it seemed like the 12t gear was slightly out of alignment. (On a 34x11 cassette)

 

SRAM. All the gears changed perfectly with the exception of 11 and 12.

 

Check the der hanger. Sometimes new frames get dropped...

 

If the shifting gets progressively worse as you go up or down the cassette chances are the der hanger is bent/skew.

 

Fixing bikes over the net is like fixing PC's over the net - tough work!

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