Good grief doing space science in imperial is ridiculous, hard science becomes near-impossible in imperial units.
Anyway, i expect almost all basses are actually completely metric because that's what almost all bass manufacturing uses.
The imperial equivalent is only stated in customer-facing specifications because it's more familiar and because players are used to 34" or 35" and need to know a bass has these scales without having to use a calculator.
When both are stated the scale in mms is likely exact and the scale in inches is not exact.
For example Ibanez SR 864mm = 34.015748031" but this is stated as 34".
Anyway, i expect almost all basses are actually completely metric because that's what almost all bass manufacturing uses.
The imperial equivalent is only stated in customer-facing specifications because it's more familiar and because players are used to 34" or 35" and need to know a bass has these scales without having to use a calculator.
When both are stated the scale in mms is likely exact and the scale in inches is not exact.
For example Ibanez SR 864mm = 34.015748031" but this is stated as 34".

