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Old 05-30-20 | 03:28 AM
  #9  
Maribel y Jose
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Joined: May 2020
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Hello, we have a tandem with shimano ultegra 11 V. We have found that 11 speed chains are more durable and better than 10v chains. We have tried several brands and without a doubt for us the best is KMC 11v SL or a cheaper option KMC 11V EL
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