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The surface treatments differ between cassettes, with Tiagra probably not having any, 105 having some sort of nickel plating, and Ultegra having some unknown treatment. We don't actually know if this makes a difference in durability. For chains, the low friction treatments do differ, and it's been shown that there's a very small but measurable difference in friction.
– Weiwen Ng
Commented Feb 24, 2023 at 14:21
@WeiwenNg A bit late here, but how long does that initial, new-chain friction difference last once the chain gets outside and starts collecting dust and grime? My guess is "not very long".
– Andrew Henle
Commented May 8, 2023 at 15:38

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