I tried to set my 40mm 120tpi xplor’s (early 2014 tyres – perhaps they changed the bead dia?) up on Velocity Aileron rims but they were far to baggy/loose on the rim – they are so loose that unless you wrapped a bit of insulation tape around the tyre + rim to hold them in place whilst fitting then they would just fall off and that’s with tubes – when i tried tubeless i used an entire roll of stans yellow tape and even then they were still loose on the rim – i eventually managed to get them up with the aid of a 240litre compressor up my workshop but as the sidewalls are so thin (i used 240ml of stans to get them sealed initially) and the bead dia was so loose i very quickly came to my senses and removed them – i wouldn’t have trusted them.
Perhaps it was an early batch of tyres with a slightly oversized bead dia or perhaps it was my velocity aileron rims but i doubt that as the rims set up tubeless really easy with On-One Gravel road, Compass Barlow Pass, Schwalbe One and Panaracer Gravel Road.