* Adapter for Tacx Direct Drive trainer* 01 is compatible with 142 x 12mm and 148 x 12mm* 02 is compatible with 135 x 10mm* 03 is compatible with 135 x 12mm (w/5 mm spacer included with every Tacx Direct Drive trainer), 142 x 12mm and 148 x 12mm* 04 The thru axle adapter kit is for bikes with a 12 mm thru axle. The axle adapter is required to couple the rear stay with thethru axle mount on a Tacx NEO or FLUX Smart trainer.​​