White Industries Centerlock Disc hubs, 28 holes in black - 15x100 TA front, 12x142 TA rear. Both front and rear are laced 3 cross to DT Swiss XR361 rims, an awesomely light offset disc only rim well suited to XC MTB, cyclocross or gravel road rides. Holding it all together are Sapim CX Ray bladed spokes and DT Swiss alloy nipples. The complete set weighs 1558 grams and should ride extra smooth with the low pro rim!