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
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