15mm is possible on regular calibers with a few speed rings depending on the height of the nipples on your motor so to speak. You may ave to spin the nylock nut round to get the nylock to hold the thread. I’ll try and dig out a photo.
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Possible with dual 6355 and 15mm pulleys. Just add a few speed rings to the axle to push out the wheel and wheel pulley. But of course 12mm is fine too.
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Thanks so much for sharing this thread ended up helping me out a lot. These set ups look really nice and clean.
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Love that crossbar. Which mounts are those ?