# Drivetrain efficiency - does chainring size really matter?

**URL:** <https://www.trainerroad.com/forum/t/drivetrain-efficiency-does-chainring-size-really-matter/55495>\
**Category:** Equipment\
**Created:** [March 15, 2021, 2:31pm UTC](https://www.trainerroad.com/forum/t/drivetrain-efficiency-does-chainring-size-really-matter/55495 "2021-03-15T14:31:30Z")\
**Posts on this page:** 1\
**Showing post:** 8

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**Author:** ![ABG](https://avatars.discourse-cdn.com/v4/letter/a/e274bd/32.png) [@ABG](https://www.trainerroad.com/forum/u/ABG)\
**Post date:** [March 15, 2021, 3:48pm UTC](https://www.trainerroad.com/forum/t/drivetrain-efficiency-does-chainring-size-really-matter/55495/8 "2021-03-15T15:48:43Z")

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I think anything after 56tooth you lose aero at more watts then you will gain based on the marginal gains podcast i listened to.

I tend to think a 28 is not enough gear for most cyclists.

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