On paper, a 10-tooth sprocket offers a massive gear range, but in the real world of mechanical friction, tighter chain articulation and increased tension cost you free watts. Using drivetrain efficiency data from CeramicSpeed, we break down exactly how much power you lose in steady riding, full-gas sprints, and 40 km time trials. Discover why pro riders run huge chainrings, how chainline angle impacts performance, and which gear combinations you should avoid on your own bike.

Chapters: ⏱️

00:00 - The Problem with the 10T Cog

00:39 - The Science of Drivetrain Friction

01:56 - 10T vs 11T: The Real-World Watt Penalty

02:40 - The Cost of Bad Chainline

03:00 - Does It Matter in a Sprint?

03:30 - Time Trial Gains & Massive Chainrings

06:55 - Chainline & 1x vs 2x Drivetrains

08:01 - The Least Efficient Gear Combination

09:01 - Electronic Gearing & Synchro Shift

10:00 - Oversized Rings: Worth the Trade-Off?

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Would you rather run a cassette starting with a 10T cog for a broader gear range, or stick to an 11T minimum with larger chainrings to chase every single watt? Let us know in the comments below! 👇

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