Joined: Jul 2015
Posts: 7,413
Likes: 3,250
From: NW Oregon
Bikes: 1982 Trek 930R Custom, '91 Diamondback Ascent w/ XT, XTR updates, Fuji Team Pro CF road flyer, Specialized Sirrus Gravel Convert, '09 Comencal Meta 5.5 XC, '02 Marin MBX500, '84 Gitane Criterium bike
the "adapter" will be the correct 15 x 100 thru axle and matching hub.
the problem is the threads on the thru axle.
and adapter would be a threaded insert, and then a bushing for the lever end of the thru axle...
the threaded insert can not be made since the threads on the outside would cut into the threads on the inside, leaving a mess of metal chips instead of a sleeve.
get a correct 15mm TA axle and hub, bub.