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  • Looks like Ultegra are both bearing not bushing and a tenner to replace so I think I'll just get some of those. No idea on mileage. "Lots" would be a reasonable guess.

    "Precision sealed bearings in both guide and tension pulleys keep drivetrain smooth and friction-free."

  • Yeah, they are bearings. Hope do some replacements with nice bearings that I've stuck on some worn out 105 derailleurs in the past. I'd imagine they are comparable to ultegra, though.

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