I designed these wheels for larger weight hangers that i also designed. i wanted the inner foam stretched a bit more for less sidewall roll and the weight a bit lower. The outer face is standard 2.2 size to fit 2.2 pin tires ans meet comp specs. but i added strrenth in the standoffs using 6 stand offs 20mm lenth m3 thread and countersunk m3x 10 hardware. I sell the wheel faces in carbon fiber since the printed ones were not as durable. but the inner rings are fine in pla+