DT AERO 40 Disc 180 AERO 52 Disc this entry level option is

this entry level option is perfect for beginners looking for an affordable high-quality wheelset

Headtube:  1-1/2"

Spacer: Carbon

The only real difference is the 350S is more affordable

and modern aesthetics in one elite package

DT AERO 40 Disc 180 AERO 52 Disc this entry level option isFeatures Wide Rim Tech 25mm rim wide creates a better, more stable support, while the shape of the tire and rim together creates regular, stable air flow, in short, more aerodynamics, less attrition. provides an ideal basis for 25 28mm tires, the sizes currently popular. 2 Way Clincher Tubeless. Tubes or No Tubes Use either traditional tires with tubes, or tubeless tires without tubes. Tubeless tires can provide lower rolling resistance and better