Thread: Vintage Shimano Compatibility Check
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Old 11-15-21, 12:14 PM
  #11  
Jeff Neese
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According to Velobase, the RD-6400 has a maximum cog size of 28 and max chainwrap of 26. That of course is independent of whether your shifters are compatible.

https://velobase.com/ViewComponent.a...2-d3236e2fd096
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