Old 08-29-21 | 12:49 PM
  #3  
SoSmellyAir
Method to My Madness
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Joined: Nov 2020
Posts: 4,708
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From: Orange County, California

Bikes: Trek FX 2, Cannondale Synapse x2, Cannondale CAAD4, Santa Cruz Stigmata 3

I used to have the same pulleys on my 105 5800 RD. If you clean them up, you should see that one pulley is marked Guide (the upper one closer to the cassette) and that the other pulley is marked Tension (the lower one at the end of the RD cage).
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