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@MementoMori
This is BMC specific due to the fact they use their own proprietary adapter for the front fork.
On non-BMC frames and forks:
If you want to run a 160 up front, get the 160 caliper and there’s no need for an adapter.
Same goes for the rear in case of both 160 and 140, pick the right caliper to match the rotor and there’s no need for an adapter.
If however, you’d like to run a 140 caliper up front (no matter whether it’s with a 160/140 rotor) you’ll need the front adapter. It’s one and the same, to be mounted either up or down pending rotor size.
Using a 140 caliper with a 160 rotor in the rear, requires the rear adapter. Using a 140 caliper with a 140 rotor in the rear doesn’t require any adapter.