-
Of course.
Be aware that the part of the hub that fits in the dropout is larger for a 15mm hub than a 12mm hub. That is, the outer part. So using a 15mm hub with a reducer sleeve for the axle max not work with some fork dropout designs.
Edit: here's an explanation and diagram of what you would need to check for compatibility: https://www.halowheels.com/can-i-convert-my-15mm-thru-axle-hub-to-12mm/
I get you, thanks.
For a mate - will speak to her and get back to you @Cupcakes