Are you aware that just because you can use adapters for the hubs, you can't just resize the dropouts by bending the frame to take a 12x142 hub, you would need to to have the appropriate mount/threading added if using a 12x142mm hub, as all of these are thru-axles, a different design to a 135mm. have a look here for what the specs are 12 mm x 142 mm Axle Standard Explained - Pinkbike

When you asked this question in the mechanics forum http://www.bikeforums.net/bicycle-me...questions.html, you made it sound like you were using one wheel on 2 different bikes, which can be done, not the what you are describing in this thread with one frame and two hub sizes