Slow shifting is a bummer, and there are lots of reasons for it, but if you've eliminated derailleur problems, cassette issues, and general grime as the culprits, it might be time to replace your shift cables and housing with Shimano's Dura-Ace OT-SP41 Polymer-Coated Derailleur Cable. The housing...

More Info

Though the Shimano's Dura-Ace R9100 groupset is a marked departure from its predecessor, the R9000, the accompanying Dura-Ace R9100 OT-SP41 Polymer-Coated Derailleur Cable Set is largely unchanged: The stainless cables are still polymer-coated and the housing is still lubed with silicone. No...

More Info