# Ballpark CdA

**URL:** <https://community.escapecollective.com/t/ballpark-cda/2644>\
**Category:** Performance\
**Tags:** aero\
**Created:** [July 18, 2025, 8:22pm UTC](https://community.escapecollective.com/t/ballpark-cda/2644 "2025-07-18T20:22:27Z")\
**Posts on this page:** 1\
**Showing post:** 11

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**Author:** ![Robert\_Chung](https://community.escapecollective.com/user_avatar/community.escapecollective.com/robert_chung/32/635_2.png) [@Robert\_Chung](https://community.escapecollective.com/u/Robert_Chung)\
**Post date:** [August 10, 2025, 10:09pm UTC](https://community.escapecollective.com/t/ballpark-cda/2644/11 "2025-08-10T22:09:03Z")

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Jonas: In general, you can get reasonable relative rankings by freezing either CdA or Crr but if you need actual estimates of the two (we don’t, always – but sometimes we do) you probably have to go to the trouble to estimate them simultaneously. John Karrasch discusses that here: [Gravel Tires - Slicks, Tread or otherwise - there is no "best" - #146 by John\_Karrasch](https://community.escapecollective.com/t/gravel-tires-slicks-tread-or-otherwise-there-is-no-best/1853/146)

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