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Shimano sells two types of 10-speed chainring, one for 2x and one for 3x systems. The smallest chainring have a 64mm BCD for both systems, and it looks the same to me. So what is the difference between them since they are sold as 2x and 3x specific? Or can they be used interchangeably?

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  • My guess is that on a 3x system, both the middle and large rings need ramps and pins to facilitate upshifts. 3x small rings are smaller than 2x small rings. – Argenti Apparatus May 26 at 21:15
  • You should mention that you realize they have different tooth counts (22 vs 24). – Armand May 27 at 15:38

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