I am an owner of repair stand Tacx T3050 as well. In order to mount my MTB I use a Peruzzo adapter that cost 15 Eur. Unfortunately I still have not handled how to mount my MTB on a rear 12mm/142mm thru axle :( . Do you have any hint? thanks https://www.mtbiker.sk/shop/prislusenstvo/nosice-na-auto/pr...